Merge pull request #305 from sudhir9297/feat/elevator-system

Add procedural elevator system with floorplan, runtime, and first-person support

apps/editor/public/icons/elevator.svg

@@ -0,0 +1,10 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64" role="img" aria-label="Elevator">
+  <rect x="12" y="6" width="40" height="52" rx="5" fill="#d9e2ec"/>
+  <rect x="16" y="10" width="32" height="44" rx="2" fill="#64748b"/>
+  <path d="M32 10v44" stroke="#d9e2ec" stroke-width="2.5"/>
+  <rect x="20" y="15" width="10" height="15" rx="1.5" fill="#9bd7ff" opacity=".9"/>
+  <rect x="34" y="15" width="10" height="15" rx="1.5" fill="#9bd7ff" opacity=".9"/>
+  <circle cx="23" cy="41" r="2.2" fill="#fbbf24"/>
+  <circle cx="41" cy="41" r="2.2" fill="#fbbf24"/>
+  <path d="M26 48h12" stroke="#d9e2ec" stroke-linecap="round" stroke-width="3"/>
+</svg>

packages/core/src/events/bus.ts

@@ -6,6 +6,7 @@ import type {
   CeilingNode,
   ColumnNode,
   DoorNode,
+  ElevatorNode,
   FenceNode,
   GuideNode,
   ItemNode,
@@ -66,6 +67,7 @@ export type StairEvent = NodeEvent<StairNode>
 export type StairSegmentEvent = NodeEvent<StairSegmentNode>
 export type WindowEvent = NodeEvent<WindowNode>
 export type DoorEvent = NodeEvent<DoorNode>
+export type ElevatorEvent = NodeEvent<ElevatorNode>
 
 // Event suffixes - exported for use in hooks
 export const eventSuffixes = [
@@ -183,6 +185,7 @@ type EditorEvents = GridEvents &
   NodeEvents<'item', ItemEvent> &
   NodeEvents<'site', SiteEvent> &
   NodeEvents<'building', BuildingEvent> &
+  NodeEvents<'elevator', ElevatorEvent> &
   NodeEvents<'level', LevelEvent> &
   NodeEvents<'zone', ZoneEvent> &
   NodeEvents<'slab', SlabEvent> &

packages/core/src/hooks/scene-registry/scene-registry.ts

@@ -14,6 +14,7 @@ export const sceneRegistry = {
     building: new Set<string>(),
     ceiling: new Set<string>(),
     column: new Set<string>(),
+    elevator: new Set<string>(),
     level: new Set<string>(),
     wall: new Set<string>(),
     fence: new Set<string>(),

packages/core/src/index.ts

@@ -5,6 +5,7 @@ export type {
   CeilingEvent,
   ColumnEvent,
   DoorEvent,
+  ElevatorEvent,
   EventSuffix,
   FenceEvent,
   GridEvent,
@@ -73,13 +74,56 @@ export {
   type ControlValue,
   type DoorAnimationState,
   type DoorInteractiveState,
+  type ElevatorInteractiveState,
+  type ElevatorPhase,
   type ItemInteractiveState,
   useInteractive,
   type WindowAnimationState,
   type WindowInteractiveState,
 } from './store/use-interactive'
+export {
+  default as useLiveNodeOverrides,
+  type LiveNodeOverrides,
+} from './store/use-live-node-overrides'
 export { default as useLiveTransforms, type LiveTransform } from './store/use-live-transforms'
 export { clearSceneHistory, default as useScene } from './store/use-scene'
+export { resolveElevatorDispatchTarget } from './systems/elevator/elevator-dispatch'
+export {
+  getElevatorCabCenterZ,
+  getElevatorCabDepth,
+  getElevatorCabWidth,
+  getElevatorDoorLeafSides,
+  getElevatorDoorLeafWidth,
+  getElevatorDoorLeafX,
+  getElevatorShaftDepth,
+  getElevatorShaftWallThickness,
+  getElevatorShaftWidth,
+  getResolvedElevatorDoorPanelStyle,
+  getResolvedElevatorDoorStyle,
+  getResolvedElevatorShaftStyle,
+  type ElevatorDoorSide,
+} from './systems/elevator/elevator-geometry'
+export { syncAutoElevatorOpenings } from './systems/elevator/elevator-opening-sync'
+export { ElevatorOpeningSystem } from './systems/elevator/elevator-opening-system'
+export {
+  createElevatorInteractiveState,
+  openElevatorDoor,
+  openElevatorDoorState,
+  queueElevatorRequest,
+  requestElevatorLevel,
+  stepElevatorRuntimeState,
+  stepElevatorRuntimes,
+} from './systems/elevator/elevator-runtime'
+export { ElevatorRuntimeSystem } from './systems/elevator/elevator-runtime-system'
+export {
+  DEFAULT_ELEVATOR_LEVEL_HEIGHT,
+  type ElevatorLevelEntry,
+  getElevatorLevelHeight,
+  resolveElevatorBuildingLevels,
+  resolveElevatorLevels,
+  resolveElevatorServiceLevelIds,
+  resolveElevatorServiceLevels,
+} from './systems/elevator/elevator-service'
 export { syncAutoStairOpenings } from './systems/stair/stair-opening-sync'
 export {
   getClampedWallCurveOffset,

packages/core/src/schema/index.ts

@@ -42,6 +42,12 @@ export {
   ColumnSupportStyle,
 } from './nodes/column'
 export { DoorNode, DoorSegment } from './nodes/door'
+export {
+  ElevatorDoorPanelStyle,
+  ElevatorDoorStyle,
+  ElevatorNode,
+  ElevatorShaftStyle,
+} from './nodes/elevator'
 export { FenceBaseStyle, FenceNode, FenceStyle } from './nodes/fence'
 export { GuideNode, GuideScaleReference } from './nodes/guide'
 export type {

packages/core/src/schema/nodes/building.ts

@@ -1,12 +1,13 @@
 import dedent from 'dedent'
 import { z } from 'zod'
 import { BaseNode, nodeType, objectId } from '../base'
+import { ElevatorNode } from './elevator'
 import { LevelNode } from './level'
 
 export const BuildingNode = BaseNode.extend({
   id: objectId('building'),
   type: nodeType('building'),
-  children: z.array(LevelNode.shape.id).default([]),
+  children: z.array(z.union([LevelNode.shape.id, ElevatorNode.shape.id])).default([]),
   position: z.tuple([z.number(), z.number(), z.number()]).default([0, 0, 0]),
   rotation: z.tuple([z.number(), z.number(), z.number()]).default([0, 0, 0]),
 }).describe(
@@ -14,7 +15,7 @@ export const BuildingNode = BaseNode.extend({
   Building node - used to represent a building
   - position: position in site coordinate system
   - rotation: rotation in site coordinate system
-  - children: array of level nodes (each level is a tree of floor and wall nodes) 
+  - children: array of level nodes and building-level systems such as elevators
   `,
 )
 

packages/core/src/schema/nodes/ceiling.ts

@@ -21,7 +21,7 @@ export const CeilingNode = BaseNode.extend({
   Ceiling node - used to represent a ceiling in the building
   - polygon: array of [x, z] points defining the ceiling boundary
   - holes: array of polygons representing holes in the ceiling
-  - holeMetadata: metadata parallel to holes, used to preserve manual and stair-managed cutouts
+  - holeMetadata: metadata parallel to holes, used to preserve manual and auto-managed cutouts
   - autoFromWalls: whether the ceiling is automatically generated from a closed wall loop
   `,
 )

packages/core/src/schema/nodes/elevator.ts

@@ -0,0 +1,64 @@
+import dedent from 'dedent'
+import { z } from 'zod'
+import { BaseNode, nodeType, objectId } from '../base'
+import { MaterialSchema } from '../material'
+
+export const ElevatorDoorStyle = z.enum(['center-opening', 'single-left', 'single-right'])
+export const ElevatorDoorPanelStyle = z.enum(['glass-frame', 'solid-panel', 'segmented-panel'])
+export const ElevatorShaftStyle = z.enum(['solid', 'glass'])
+
+export type ElevatorDoorPanelStyle = z.infer<typeof ElevatorDoorPanelStyle>
+export type ElevatorDoorStyle = z.infer<typeof ElevatorDoorStyle>
+export type ElevatorShaftStyle = z.infer<typeof ElevatorShaftStyle>
+
+export const ElevatorNode = BaseNode.extend({
+  id: objectId('elevator'),
+  type: nodeType('elevator'),
+  material: MaterialSchema.optional(),
+  materialPreset: z.string().optional(),
+  position: z.tuple([z.number(), z.number(), z.number()]).default([0, 0, 0]),
+  // Rotation around the Y axis in radians.
+  rotation: z.number().default(0),
+  width: z.number().default(1.6),
+  depth: z.number().default(1.6),
+  shaftWidth: z.number().optional(),
+  shaftDepth: z.number().optional(),
+  shaftWallThickness: z.number().default(0.09),
+  shaftStyle: ElevatorShaftStyle.default('solid'),
+  cabHeight: z.number().default(2.35),
+  doorWidth: z.number().default(0.95),
+  doorHeight: z.number().default(2.1),
+  doorStyle: ElevatorDoorStyle.default('center-opening'),
+  doorPanelStyle: ElevatorDoorPanelStyle.default('glass-frame'),
+  fromLevelId: z.string().nullable().default(null),
+  toLevelId: z.string().nullable().default(null),
+  servedLevelIds: z.array(z.string()).optional(),
+  disabledLevelIds: z.array(z.string()).default([]),
+  serviceOnlyLevelIds: z.array(z.string()).default([]),
+  defaultLevelId: z.string().nullable().default(null),
+  speed: z.number().default(2.2),
+  doorDurationMs: z.number().default(900),
+  dwellMs: z.number().default(1400),
+}).describe(
+  dedent`
+  Elevator node - a vertical transport core attached to a building.
+  - parentId: building that owns this elevator
+  - position: building-local shaft center on the X/Z plane
+  - rotation: rotation around the Y axis
+  - width/depth: cab footprint
+  - shaftWidth/shaftDepth: optional clear shaft footprint; falls back to cab footprint
+  - shaftWallThickness: visible shaft shell thickness
+  - shaftStyle: solid or glass shaft shell presentation
+  - cabHeight: visible elevator cab height
+  - doorWidth/doorHeight/doorStyle: landing and cab door movement/opening presentation
+  - doorPanelStyle: visual leaf style for glass-frame, solid-panel, or segmented-panel doors
+  - fromLevelId / toLevelId: source and destination levels used for service range and auto cutouts
+  - servedLevelIds: legacy optional explicit level list; used only when from/to are missing
+  - disabledLevelIds: stops visible in the service range but unavailable for public/cab requests
+  - serviceOnlyLevelIds: stops unavailable from landing calls but available from cab/admin controls
+  - defaultLevelId: starting/resting level, falling back to the lowest served level
+  - speed/doorDurationMs/dwellMs: runtime animation defaults
+  `,
+)
+
+export type ElevatorNode = z.infer<typeof ElevatorNode>

packages/core/src/schema/nodes/slab.ts

@@ -19,7 +19,7 @@ export const SlabNode = BaseNode.extend({
   Slab node - used to represent a slab/floor in the building
   - polygon: array of [x, z] points defining the slab boundary
   - holes: array of [x, z] polygons representing cutouts in the slab
-  - holeMetadata: metadata parallel to holes, used to preserve manual and stair-managed cutouts
+  - holeMetadata: metadata parallel to holes, used to preserve manual and auto-managed cutouts
   - elevation: elevation in meters
   - autoFromWalls: whether the slab is automatically generated from a closed wall loop
   `,

packages/core/src/schema/nodes/surface-hole-metadata.ts

@@ -1,8 +1,10 @@
 import { z } from 'zod'
 
 export const SurfaceHoleMetadata = z.object({
-  source: z.enum(['manual', 'stair']).default('manual'),
+  // Stair/elevator auto-openings use stairId/elevatorId so sync can replace only its own holes.
+  source: z.enum(['manual', 'stair', 'elevator']).default('manual'),
   stairId: z.string().optional(),
+  elevatorId: z.string().optional(),
 })
 
 export type SurfaceHoleMetadata = z.infer<typeof SurfaceHoleMetadata>

packages/core/src/schema/types.ts

@@ -3,6 +3,7 @@ import { BuildingNode } from './nodes/building'
 import { CeilingNode } from './nodes/ceiling'
 import { ColumnNode } from './nodes/column'
 import { DoorNode } from './nodes/door'
+import { ElevatorNode } from './nodes/elevator'
 import { FenceNode } from './nodes/fence'
 import { GuideNode } from './nodes/guide'
 import { ItemNode } from './nodes/item'
@@ -22,6 +23,7 @@ import { ZoneNode } from './nodes/zone'
 export const AnyNode = z.discriminatedUnion('type', [
   SiteNode,
   BuildingNode,
+  ElevatorNode,
   LevelNode,
   ColumnNode,
   WallNode,

packages/core/src/store/use-interactive.ts

@@ -39,12 +39,25 @@ export type WindowAnimationState = {
   persist: boolean
 }
 
+export type ElevatorPhase = 'idle' | 'closing' | 'moving' | 'opening' | 'open'
+
+export type ElevatorInteractiveState = {
+  currentLevelId: AnyNodeId | null
+  targetLevelId: AnyNodeId | null
+  carY: number
+  doorOpen: number
+  phase: ElevatorPhase
+  phaseStartedAt: number | null
+  queue: AnyNodeId[]
+}
+
 type InteractiveStore = {
   items: Record<AnyNodeId, ItemInteractiveState>
   doors: Record<AnyNodeId, DoorInteractiveState>
   doorAnimations: Record<AnyNodeId, DoorAnimationState>
   windows: Record<AnyNodeId, WindowInteractiveState>
   windowAnimations: Record<AnyNodeId, WindowAnimationState>
+  elevators: Record<AnyNodeId, ElevatorInteractiveState>
 
   /** Initialize a node's interactive state from its asset definition (idempotent) */
   initItem: (itemId: AnyNodeId, interactive: Interactive) => void
@@ -78,6 +91,15 @@ type InteractiveStore = {
 
   /** Cancel a queued window animation */
   cancelWindowAnimation: (windowId: AnyNodeId) => void
+
+  /** Initialize an elevator's runtime state from its default served level. */
+  initElevator: (elevatorId: AnyNodeId, levelId: AnyNodeId, carY: number) => void
+
+  /** Merge runtime elevator state. */
+  setElevatorState: (elevatorId: AnyNodeId, value: Partial<ElevatorInteractiveState>) => void
+
+  /** Remove elevator runtime state when its renderer unmounts. */
+  removeElevator: (elevatorId: AnyNodeId) => void
 }
 
 const defaultControlValue = (interactive: Interactive, index: number): ControlValue => {
@@ -99,6 +121,7 @@ export const useInteractive = create<InteractiveStore>((set, get) => ({
   doorAnimations: {},
   windows: {},
   windowAnimations: {},
+  elevators: {},
 
   initItem: (itemId, interactive) => {
     const { controls } = interactive
@@ -203,4 +226,47 @@ export const useInteractive = create<InteractiveStore>((set, get) => ({
       return { windowAnimations: rest }
     })
   },
+
+  initElevator: (elevatorId, levelId, carY) => {
+    if (get().elevators[elevatorId]) return
+
+    set((state) => ({
+      elevators: {
+        ...state.elevators,
+        [elevatorId]: {
+          currentLevelId: levelId,
+          targetLevelId: null,
+          carY,
+          doorOpen: 0,
+          phase: 'idle',
+          phaseStartedAt: null,
+          queue: [],
+        },
+      },
+    }))
+  },
+
+  setElevatorState: (elevatorId, value) => {
+    set((state) => {
+      const current = state.elevators[elevatorId]
+      if (!current) return state
+
+      return {
+        elevators: {
+          ...state.elevators,
+          [elevatorId]: {
+            ...current,
+            ...value,
+          },
+        },
+      }
+    })
+  },
+
+  removeElevator: (elevatorId) => {
+    set((state) => {
+      const { [elevatorId]: _, ...rest } = state.elevators
+      return { elevators: rest }
+    })
+  },
 }))

packages/core/src/store/use-live-node-overrides.ts

@@ -0,0 +1,31 @@
+import { create } from 'zustand'
+
+export type LiveNodeOverrides = Record<string, unknown>
+
+type LiveNodeOverrideState = {
+  overrides: Map<string, LiveNodeOverrides>
+  set(nodeId: string, values: LiveNodeOverrides): void
+  get(nodeId: string): LiveNodeOverrides | undefined
+  clear(nodeId: string): void
+  clearAll(): void
+}
+
+const useLiveNodeOverrides = create<LiveNodeOverrideState>((set, get) => ({
+  overrides: new Map(),
+  set: (nodeId, values) =>
+    set((state) => {
+      const next = new Map(state.overrides)
+      next.set(nodeId, { ...(next.get(nodeId) ?? {}), ...values })
+      return { overrides: next }
+    }),
+  get: (nodeId) => get().overrides.get(nodeId),
+  clear: (nodeId) =>
+    set((state) => {
+      const next = new Map(state.overrides)
+      next.delete(nodeId)
+      return { overrides: next }
+    }),
+  clearAll: () => set({ overrides: new Map() }),
+}))
+
+export default useLiveNodeOverrides

packages/core/src/systems/elevator/elevator-dispatch.ts

@@ -0,0 +1,90 @@
+import type { AnyNode, AnyNodeId, ElevatorNode } from '../../schema'
+import type { ElevatorInteractiveState } from '../../store/use-interactive'
+import { resolveElevatorServiceLevels } from './elevator-service'
+
+type ElevatorRuntimeMap = Record<AnyNodeId, ElevatorInteractiveState>
+
+type ResolveElevatorDispatchTargetArgs = {
+  elevators: ElevatorRuntimeMap
+  levelId: AnyNodeId
+  nodes: Record<string, AnyNode>
+  requestedElevatorId: AnyNodeId
+}
+
+function getRuntimeLevelId(runtime: ElevatorInteractiveState | undefined, elevator: ElevatorNode) {
+  return runtime?.currentLevelId ?? elevator.defaultLevelId ?? elevator.fromLevelId ?? null
+}
+
+function scoreDispatchCandidate({
+  elevator,
+  elevators,
+  levelId,
+  nodes,
+}: {
+  elevator: ElevatorNode
+  elevators: ElevatorRuntimeMap
+  levelId: AnyNodeId
+  nodes: Record<string, AnyNode>
+}) {
+  if ((elevator.disabledLevelIds ?? []).includes(levelId)) return null
+  if ((elevator.serviceOnlyLevelIds ?? []).includes(levelId)) return null
+
+  const serviceLevels = resolveElevatorServiceLevels(elevator, nodes)
+  const targetIndex = serviceLevels.findIndex((level) => level.id === levelId)
+  if (targetIndex < 0) return null
+
+  const runtime = elevators[elevator.id as AnyNodeId]
+  const runtimeLevelId = getRuntimeLevelId(runtime, elevator)
+  const currentIndex = runtimeLevelId
+    ? serviceLevels.findIndex((level) => level.id === runtimeLevelId)
+    : -1
+  const resolvedCurrentIndex = currentIndex >= 0 ? currentIndex : 0
+  const distance = Math.abs(targetIndex - resolvedCurrentIndex)
+  const queuePenalty = (runtime?.queue.length ?? 0) * 2 + (runtime?.targetLevelId ? 1 : 0)
+  const motionPenalty = runtime?.phase === 'moving' || runtime?.phase === 'closing' ? 0.5 : 0
+  const openPenalty = runtime?.phase === 'open' || runtime?.phase === 'opening' ? 0.2 : 0
+
+  return distance + queuePenalty + motionPenalty + openPenalty
+}
+
+export function resolveElevatorDispatchTarget({
+  elevators,
+  levelId,
+  nodes,
+  requestedElevatorId,
+}: ResolveElevatorDispatchTargetArgs): AnyNodeId {
+  const requestedElevator = nodes[requestedElevatorId]
+  if (!(requestedElevator?.type === 'elevator' && requestedElevator.parentId)) {
+    return requestedElevatorId
+  }
+
+  const building = nodes[requestedElevator.parentId as AnyNodeId]
+  if (building?.type !== 'building') {
+    return requestedElevatorId
+  }
+
+  let bestElevatorId: AnyNodeId | null = null
+  let bestScore = Number.POSITIVE_INFINITY
+
+  for (const childId of building.children) {
+    const candidate = nodes[childId as AnyNodeId]
+    if (!(candidate?.type === 'elevator' && candidate.visible !== false)) continue
+
+    const score = scoreDispatchCandidate({
+      elevator: candidate,
+      elevators,
+      levelId,
+      nodes,
+    })
+    if (score === null) continue
+
+    const tieBreaker = candidate.id === requestedElevatorId ? -0.01 : 0
+    const finalScore = score + tieBreaker
+    if (finalScore < bestScore) {
+      bestScore = finalScore
+      bestElevatorId = candidate.id as AnyNodeId
+    }
+  }
+
+  return bestElevatorId ?? requestedElevatorId
+}

packages/core/src/systems/elevator/elevator-geometry.ts

@@ -0,0 +1,92 @@
+import type {
+  ElevatorDoorPanelStyle,
+  ElevatorDoorStyle,
+  ElevatorNode,
+  ElevatorShaftStyle,
+} from '../../schema'
+
+export type ElevatorDoorSide = 'left' | 'right'
+
+const DEFAULT_ELEVATOR_SHAFT_WALL_THICKNESS = 0.09
+
+export function getResolvedElevatorDoorStyle(
+  doorStyle: ElevatorNode['doorStyle'] | undefined,
+): ElevatorDoorStyle {
+  return doorStyle ?? 'center-opening'
+}
+
+export function getResolvedElevatorDoorPanelStyle(
+  doorPanelStyle: ElevatorNode['doorPanelStyle'] | undefined,
+): ElevatorDoorPanelStyle {
+  return doorPanelStyle ?? 'glass-frame'
+}
+
+export function getResolvedElevatorShaftStyle(
+  shaftStyle: ElevatorNode['shaftStyle'] | undefined,
+): ElevatorShaftStyle {
+  return shaftStyle ?? 'solid'
+}
+
+export function getElevatorDoorLeafSides(
+  doorStyle: ElevatorNode['doorStyle'] | undefined,
+): ElevatorDoorSide[] {
+  const resolvedDoorStyle = getResolvedElevatorDoorStyle(doorStyle)
+  if (resolvedDoorStyle === 'single-left') return ['left']
+  if (resolvedDoorStyle === 'single-right') return ['right']
+  return ['left', 'right']
+}
+
+export function getElevatorDoorLeafX(
+  side: ElevatorDoorSide,
+  openingWidth: number,
+  doorOpen: number,
+  doorStyle: ElevatorNode['doorStyle'] | undefined,
+) {
+  const resolvedDoorStyle = getResolvedElevatorDoorStyle(doorStyle)
+  if (resolvedDoorStyle === 'center-opening') {
+    const direction = side === 'left' ? -1 : 1
+    return direction * (openingWidth / 4 + doorOpen * openingWidth * 0.34)
+  }
+
+  const direction = resolvedDoorStyle === 'single-left' ? -1 : 1
+  return direction * doorOpen * openingWidth * 0.68
+}
+
+export function getElevatorDoorLeafWidth(
+  openingWidth: number,
+  doorStyle: ElevatorNode['doorStyle'] | undefined,
+) {
+  return getResolvedElevatorDoorStyle(doorStyle) === 'center-opening'
+    ? Math.max(openingWidth / 2 - 0.018, 0.12)
+    : Math.max(openingWidth - 0.018, 0.18)
+}
+
+export function getElevatorCabWidth(node: ElevatorNode) {
+  return Math.max(node.width, 0.8)
+}
+
+export function getElevatorCabDepth(node: ElevatorNode) {
+  return Math.max(node.depth, 0.8)
+}
+
+export function getElevatorShaftWallThickness(node: ElevatorNode) {
+  return Math.max(node.shaftWallThickness ?? DEFAULT_ELEVATOR_SHAFT_WALL_THICKNESS, 0.04)
+}
+
+export function getElevatorShaftWidth(
+  node: ElevatorNode,
+  cabWidth = getElevatorCabWidth(node),
+) {
+  return Math.max(node.shaftWidth ?? cabWidth, cabWidth, 0.8)
+}
+
+export function getElevatorShaftDepth(
+  node: ElevatorNode,
+  cabDepth = getElevatorCabDepth(node),
+) {
+  return Math.max(node.shaftDepth ?? cabDepth, cabDepth, 0.8)
+}
+
+export function getElevatorCabCenterZ(node: ElevatorNode) {
+  return -getElevatorShaftDepth(node) / 2 + getElevatorCabDepth(node) / 2
+}

packages/core/src/systems/elevator/elevator-opening-sync.test.ts

@@ -0,0 +1,162 @@
+import { describe, expect, test } from 'bun:test'
+import type { AnyNode } from '../../schema'
+import { BuildingNode, CeilingNode, ElevatorNode, LevelNode, SlabNode } from '../../schema'
+import { syncAutoElevatorOpenings } from './elevator-opening-sync'
+
+describe('syncAutoElevatorOpenings', () => {
+  test('does not add elevator holes when a manual surface hole already covers them', () => {
+    const building = BuildingNode.parse({ name: 'Building' })
+    const ground = LevelNode.parse({ name: 'Ground', level: 0, parentId: building.id })
+    const upper = LevelNode.parse({ name: 'Upper', level: 1, parentId: building.id })
+    const elevator = ElevatorNode.parse({
+      name: 'Elevator',
+      parentId: building.id,
+      position: [2, 0, 1.5],
+      width: 1.6,
+      depth: 1.6,
+    })
+    const buildingWithChildren = {
+      ...building,
+      children: [ground.id, upper.id, elevator.id],
+    }
+    const manualOpening: Array<[number, number]> = [
+      [1, 0.5],
+      [3, 0.5],
+      [3, 2.5],
+      [1, 2.5],
+    ]
+    const sourceCeiling = CeilingNode.parse({
+      name: 'Source Ceiling',
+      parentId: ground.id,
+      polygon: [
+        [0, 0],
+        [4, 0],
+        [4, 3],
+        [0, 3],
+      ],
+      holes: [manualOpening],
+      holeMetadata: [{ source: 'manual' }],
+    })
+    const upperSlab = SlabNode.parse({
+      name: 'Upper Slab',
+      parentId: upper.id,
+      polygon: [
+        [0, 0],
+        [4, 0],
+        [4, 3],
+        [0, 3],
+      ],
+      holes: [manualOpening],
+      holeMetadata: [{ source: 'manual' }],
+    })
+    const nodes = Object.fromEntries(
+      [buildingWithChildren, ground, upper, elevator, sourceCeiling, upperSlab].map((node) => [
+        node.id,
+        node,
+      ]),
+    ) as Record<string, AnyNode>
+
+    const updates = syncAutoElevatorOpenings(nodes)
+
+    expect(updates.find((update) => update.id === upperSlab.id)).toBeUndefined()
+    expect(updates.find((update) => update.id === sourceCeiling.id)).toBeUndefined()
+  })
+
+  test('adds elevator holes when an existing manual hole is too small', () => {
+    const building = BuildingNode.parse({ name: 'Building' })
+    const ground = LevelNode.parse({ name: 'Ground', level: 0, parentId: building.id })
+    const upper = LevelNode.parse({ name: 'Upper', level: 1, parentId: building.id })
+    const elevator = ElevatorNode.parse({
+      name: 'Elevator',
+      parentId: building.id,
+      position: [2, 0, 1.5],
+      width: 1.6,
+      depth: 1.6,
+    })
+    const buildingWithChildren = {
+      ...building,
+      children: [ground.id, upper.id, elevator.id],
+    }
+    const smallManualOpening: Array<[number, number]> = [
+      [1.7, 1.2],
+      [2.3, 1.2],
+      [2.3, 1.8],
+      [1.7, 1.8],
+    ]
+    const upperSlab = SlabNode.parse({
+      name: 'Upper Slab',
+      parentId: upper.id,
+      polygon: [
+        [0, 0],
+        [4, 0],
+        [4, 3],
+        [0, 3],
+      ],
+      holes: [smallManualOpening],
+      holeMetadata: [{ source: 'manual' }],
+    })
+    const nodes = Object.fromEntries(
+      [buildingWithChildren, ground, upper, elevator, upperSlab].map((node) => [node.id, node]),
+    ) as Record<string, AnyNode>
+
+    const updates = syncAutoElevatorOpenings(nodes)
+    const slabUpdate = updates.find((update) => update.id === upperSlab.id)
+
+    expect(slabUpdate?.data.holes).toHaveLength(2)
+    expect(slabUpdate?.data.holes?.[0]).toEqual(smallManualOpening)
+    expect(slabUpdate?.data.holeMetadata).toEqual([
+      { source: 'manual' },
+      { source: 'elevator', elevatorId: elevator.id },
+    ])
+  })
+
+  test('removes stale auto elevator holes when a manual hole overlaps the elevator opening', () => {
+    const building = BuildingNode.parse({ name: 'Building' })
+    const ground = LevelNode.parse({ name: 'Ground', level: 0, parentId: building.id })
+    const upper = LevelNode.parse({ name: 'Upper', level: 1, parentId: building.id })
+    const elevator = ElevatorNode.parse({
+      name: 'Elevator',
+      parentId: building.id,
+      position: [2, 0, 1.5],
+      width: 1.6,
+      depth: 1.6,
+    })
+    const buildingWithChildren = {
+      ...building,
+      children: [ground.id, upper.id, elevator.id],
+    }
+    const manualOpening: Array<[number, number]> = [
+      [1, 0.5],
+      [3, 0.5],
+      [3, 2.5],
+      [1, 2.5],
+    ]
+    const staleAutoOpening: Array<[number, number]> = [
+      [1.12, 0.62],
+      [2.88, 0.62],
+      [2.88, 2.38],
+      [1.12, 2.38],
+    ]
+    const upperSlab = SlabNode.parse({
+      name: 'Upper Slab',
+      parentId: upper.id,
+      polygon: [
+        [0, 0],
+        [4, 0],
+        [4, 3],
+        [0, 3],
+      ],
+      holes: [manualOpening, staleAutoOpening],
+      holeMetadata: [{ source: 'manual' }, { source: 'elevator', elevatorId: elevator.id }],
+    })
+    const nodes = Object.fromEntries(
+      [buildingWithChildren, ground, upper, elevator, upperSlab].map((node) => [node.id, node]),
+    ) as Record<string, AnyNode>
+
+    const updates = syncAutoElevatorOpenings(nodes)
+    const slabUpdate = updates.find((update) => update.id === upperSlab.id)
+
+    expect(slabUpdate?.data.holes).toEqual([manualOpening])
+    expect(slabUpdate?.data.holeMetadata).toEqual([{ source: 'manual' }])
+  })
+})

packages/core/src/systems/elevator/elevator-opening-sync.ts

@@ -0,0 +1,274 @@
+import { resolveLevelId } from '../../hooks/spatial-grid/spatial-grid-sync'
+import type {
+  AnyNode,
+  AnyNodeId,
+  CeilingNode,
+  ElevatorNode,
+  SlabNode,
+  SurfaceHoleMetadata,
+} from '../../schema'
+import { resolveElevatorServiceLevels } from './elevator-service'
+
+type Point2D = [number, number]
+
+const ELEVATOR_OPENING_PADDING = 0.08
+const DEFAULT_ELEVATOR_SHAFT_WALL_THICKNESS = 0.09
+
+function pointsEqual(a: Point2D, b: Point2D, tolerance = 1e-5) {
+  const dx = a[0] - b[0]
+  const dz = a[1] - b[1]
+  return dx * dx + dz * dz <= tolerance * tolerance
+}
+
+function polygonsEqual(left: Point2D[][], right: Point2D[][]) {
+  if (left.length !== right.length) return false
+  return left.every((polygon, polygonIndex) => {
+    const other = right[polygonIndex]
+    if (!(other && polygon.length === other.length)) return false
+    return polygon.every((point, pointIndex) => {
+      const otherPoint = other[pointIndex]
+      if (!otherPoint) return false
+      return pointsEqual(point, otherPoint)
+    })
+  })
+}
+
+function metadataEqual(left: SurfaceHoleMetadata[], right: SurfaceHoleMetadata[]) {
+  if (left.length !== right.length) return false
+  return left.every(
+    (entry, index) =>
+      entry.source === right[index]?.source &&
+      (entry.elevatorId ?? null) === (right[index]?.elevatorId ?? null) &&
+      (entry.stairId ?? null) === (right[index]?.stairId ?? null),
+  )
+}
+
+function normalizeExistingMetadata(
+  holes: Point2D[][],
+  metadata: SurfaceHoleMetadata[] | undefined,
+): SurfaceHoleMetadata[] {
+  return holes.map((_, index) => metadata?.[index] ?? { source: 'manual' })
+}
+
+function rotateXZ(x: number, z: number, angle: number): [number, number] {
+  const cos = Math.cos(angle)
+  const sin = Math.sin(angle)
+  return [x * cos + z * sin, -x * sin + z * cos]
+}
+
+function pointOnSegment(point: Point2D, a: Point2D, b: Point2D, tolerance = 1e-6) {
+  const cross = (point[1] - a[1]) * (b[0] - a[0]) - (point[0] - a[0]) * (b[1] - a[1])
+  if (Math.abs(cross) > tolerance) return false
+  const dot = (point[0] - a[0]) * (b[0] - a[0]) + (point[1] - a[1]) * (b[1] - a[1])
+  if (dot < -tolerance) return false
+  const lenSq = (b[0] - a[0]) ** 2 + (b[1] - a[1]) ** 2
+  return dot <= lenSq + tolerance
+}
+
+function pointInPolygon(point: Point2D, polygon: Point2D[]) {
+  if (polygon.length < 3) return false
+  let inside = false
+  const [x, z] = point
+
+  for (let i = 0, j = polygon.length - 1; i < polygon.length; j = i++) {
+    const a = polygon[i]!
+    const b = polygon[j]!
+    if (pointOnSegment(point, a, b)) return true
+    const intersects =
+      a[1] > z !== b[1] > z && x < ((b[0] - a[0]) * (z - a[1])) / (b[1] - a[1]) + a[0]
+    if (intersects) inside = !inside
+  }
+
+  return inside
+}
+
+function polygonContainsPolygon(outer: Point2D[], inner: Point2D[]) {
+  return inner.every((point) => pointInPolygon(point, outer))
+}
+
+function isCoveredByExistingHole(existingHoles: Point2D[][], autoHole: Point2D[]) {
+  return existingHoles.some((existingHole) => polygonContainsPolygon(existingHole, autoHole))
+}
+
+function getServedLevelRange(elevator: ElevatorNode, nodes: Record<string, AnyNode>) {
+  const servedLevels = resolveElevatorServiceLevels(elevator, nodes)
+  if (servedLevels.length < 2) return null
+
+  const levelNumbers = servedLevels.map((level) => level.level)
+  return {
+    max: Math.max(...levelNumbers),
+    min: Math.min(...levelNumbers),
+    sortedServedLevels: servedLevels,
+  }
+}
+
+function getLevelNumber(levelId: string | null, nodes: Record<string, AnyNode>) {
+  if (!levelId) return undefined
+  const node = nodes[levelId as AnyNodeId]
+  return node?.type === 'level' ? node.level : undefined
+}
+
+function shouldApplyElevatorToSlab(
+  elevator: ElevatorNode,
+  slabLevelId: string,
+  nodes: Record<string, AnyNode>,
+) {
+  const range = getServedLevelRange(elevator, nodes)
+  if (!range) return false
+
+  const slabLevel = getLevelNumber(slabLevelId, nodes)
+  if (slabLevel !== undefined) {
+    return slabLevel > range.min && slabLevel <= range.max
+  }
+
+  const servedIndex = range.sortedServedLevels.findIndex((level) => level.id === slabLevelId)
+  return servedIndex > 0
+}
+
+function shouldApplyElevatorToCeiling(
+  elevator: ElevatorNode,
+  ceilingLevelId: string,
+  nodes: Record<string, AnyNode>,
+) {
+  const range = getServedLevelRange(elevator, nodes)
+  if (!range) return false
+
+  const ceilingLevel = getLevelNumber(ceilingLevelId, nodes)
+  if (ceilingLevel !== undefined) {
+    return ceilingLevel >= range.min && ceilingLevel < range.max
+  }
+
+  const servedIndex = range.sortedServedLevels.findIndex((level) => level.id === ceilingLevelId)
+  return servedIndex >= 0 && servedIndex < range.sortedServedLevels.length - 1
+}
+
+function getElevatorOpeningPolygon(elevator: ElevatorNode): Point2D[] {
+  const wallThickness = Math.max(
+    elevator.shaftWallThickness ?? DEFAULT_ELEVATOR_SHAFT_WALL_THICKNESS,
+    0.04,
+  )
+  const shaftWidth = Math.max(elevator.shaftWidth ?? elevator.width, elevator.width, 0.8)
+  const shaftDepth = Math.max(elevator.shaftDepth ?? elevator.depth, elevator.depth, 0.8)
+  const halfWidth = shaftWidth / 2 + wallThickness + ELEVATOR_OPENING_PADDING
+  const halfDepth = shaftDepth / 2 + wallThickness + ELEVATOR_OPENING_PADDING
+  const corners: Point2D[] = [
+    [-halfWidth, -halfDepth],
+    [halfWidth, -halfDepth],
+    [halfWidth, halfDepth],
+    [-halfWidth, halfDepth],
+  ]
+
+  return corners.map(([x, z]) => {
+    const [rotatedX, rotatedZ] = rotateXZ(x, z, elevator.rotation ?? 0)
+    return [elevator.position[0] + rotatedX, elevator.position[2] + rotatedZ]
+  })
+}
+
+export function syncAutoElevatorOpenings(nodes: Record<string, AnyNode>) {
+  const elevators = Object.values(nodes).filter(
+    (node): node is ElevatorNode => node.type === 'elevator' && node.visible !== false,
+  )
+  const slabs = Object.values(nodes).filter((node): node is SlabNode => node.type === 'slab')
+  const ceilings = Object.values(nodes).filter(
+    (node): node is CeilingNode => node.type === 'ceiling',
+  )
+  const updates: Array<{ id: AnyNodeId; data: Partial<SlabNode | CeilingNode> }> = []
+
+  for (const slab of slabs) {
+    const slabLevelId = resolveLevelId(slab, nodes)
+    const existingHoles = slab.holes ?? []
+    const existingMetadata = normalizeExistingMetadata(existingHoles, slab.holeMetadata)
+    const preservedHoles = existingHoles
+      .map((polygon, index) => ({ metadata: existingMetadata[index]!, polygon }))
+      .filter((entry) => entry.metadata.source !== 'elevator')
+    const manualHoles = preservedHoles.filter((entry) => entry.metadata.source !== 'stair')
+    const stairHoles = preservedHoles.filter((entry) => entry.metadata.source === 'stair')
+    const preservedHolePolygons = preservedHoles.map((entry) => entry.polygon)
+
+    const elevatorHoles = elevators
+      .filter((elevator) => shouldApplyElevatorToSlab(elevator, slabLevelId, nodes))
+      .map((elevator) => ({
+        polygon: getElevatorOpeningPolygon(elevator),
+        metadata: {
+          elevatorId: elevator.id,
+          source: 'elevator' as const,
+        },
+      }))
+      .filter((hole) => polygonContainsPolygon(slab.polygon, hole.polygon))
+      .filter((hole) => !isCoveredByExistingHole(preservedHolePolygons, hole.polygon))
+
+    const nextHoles = [
+      ...manualHoles.map((hole) => hole.polygon),
+      ...elevatorHoles.map((hole) => hole.polygon),
+      ...stairHoles.map((hole) => hole.polygon),
+    ]
+    const nextMetadata = [
+      ...manualHoles.map((hole) => ({ ...hole.metadata })),
+      ...elevatorHoles.map((hole) => hole.metadata),
+      ...stairHoles.map((hole) => ({ ...hole.metadata })),
+    ]
+
+    if (
+      !polygonsEqual(existingHoles, nextHoles) ||
+      !metadataEqual(existingMetadata, nextMetadata)
+    ) {
+      updates.push({
+        id: slab.id,
+        data: {
+          holes: nextHoles,
+          holeMetadata: nextMetadata,
+        },
+      })
+    }
+  }
+
+  for (const ceiling of ceilings) {
+    const ceilingLevelId = resolveLevelId(ceiling, nodes)
+    const existingHoles = ceiling.holes ?? []
+    const existingMetadata = normalizeExistingMetadata(existingHoles, ceiling.holeMetadata)
+    const preservedHoles = existingHoles
+      .map((polygon, index) => ({ metadata: existingMetadata[index]!, polygon }))
+      .filter((entry) => entry.metadata.source !== 'elevator')
+    const manualHoles = preservedHoles.filter((entry) => entry.metadata.source !== 'stair')
+    const stairHoles = preservedHoles.filter((entry) => entry.metadata.source === 'stair')
+    const preservedHolePolygons = preservedHoles.map((entry) => entry.polygon)
+
+    const elevatorHoles = elevators
+      .filter((elevator) => shouldApplyElevatorToCeiling(elevator, ceilingLevelId, nodes))
+      .map((elevator) => ({
+        polygon: getElevatorOpeningPolygon(elevator),
+        metadata: {
+          elevatorId: elevator.id,
+          source: 'elevator' as const,
+        },
+      }))
+      .filter((hole) => polygonContainsPolygon(ceiling.polygon, hole.polygon))
+      .filter((hole) => !isCoveredByExistingHole(preservedHolePolygons, hole.polygon))
+
+    const nextHoles = [
+      ...manualHoles.map((hole) => hole.polygon),
+      ...elevatorHoles.map((hole) => hole.polygon),
+      ...stairHoles.map((hole) => hole.polygon),
+    ]
+    const nextMetadata = [
+      ...manualHoles.map((hole) => ({ ...hole.metadata })),
+      ...elevatorHoles.map((hole) => hole.metadata),
+      ...stairHoles.map((hole) => ({ ...hole.metadata })),
+    ]
+
+    if (
+      !polygonsEqual(existingHoles, nextHoles) ||
+      !metadataEqual(existingMetadata, nextMetadata)
+    ) {
+      updates.push({
+        id: ceiling.id,
+        data: {
+          holes: nextHoles,
+          holeMetadata: nextMetadata,
+        },
+      })
+    }
+  }
+
+  return updates
+}

packages/core/src/systems/elevator/elevator-opening-system.tsx

@@ -0,0 +1,56 @@
+import { useEffect, useRef } from 'react'
+import type { AnyNode } from '../../schema'
+import useScene from '../../store/use-scene'
+import { syncAutoElevatorOpenings } from './elevator-opening-sync'
+
+function isOpeningRelevantNode(node: AnyNode | undefined) {
+  return (
+    node?.type === 'building' ||
+    node?.type === 'ceiling' ||
+    node?.type === 'elevator' ||
+    node?.type === 'level' ||
+    node?.type === 'slab'
+  )
+}
+
+function hasOpeningRelevantNodeChange(
+  nextNodes: Record<string, AnyNode>,
+  prevNodes: Record<string, AnyNode>,
+) {
+  if (nextNodes === prevNodes) return false
+
+  const ids = new Set([...Object.keys(nextNodes), ...Object.keys(prevNodes)])
+  for (const id of ids) {
+    const nextNode = nextNodes[id]
+    const prevNode = prevNodes[id]
+    if (nextNode === prevNode) continue
+    if (isOpeningRelevantNode(nextNode) || isOpeningRelevantNode(prevNode)) return true
+  }
+
+  return false
+}
+
+export const ElevatorOpeningSystem = () => {
+  const syncingAutoOpeningsRef = useRef(false)
+
+  useEffect(() => {
+    const applyUpdates = (updates: ReturnType<typeof syncAutoElevatorOpenings>) => {
+      if (updates.length === 0) return
+      syncingAutoOpeningsRef.current = true
+      useScene.getState().updateNodes(updates)
+      queueMicrotask(() => {
+        syncingAutoOpeningsRef.current = false
+      })
+    }
+
+    applyUpdates(syncAutoElevatorOpenings(useScene.getState().nodes))
+
+    return useScene.subscribe((state, prevState) => {
+      if (syncingAutoOpeningsRef.current) return
+      if (!hasOpeningRelevantNodeChange(state.nodes, prevState.nodes)) return
+      applyUpdates(syncAutoElevatorOpenings(state.nodes))
+    })
+  }, [])
+
+  return null
+}

packages/core/src/systems/elevator/elevator-runtime-system.tsx

@@ -0,0 +1,10 @@
+import { useFrame } from '@react-three/fiber'
+import { stepElevatorRuntimes } from './elevator-runtime'
+
+export function ElevatorRuntimeSystem() {
+  useFrame(({ clock }, delta) => {
+    stepElevatorRuntimes(clock.getElapsedTime() * 1000, delta)
+  }, 2)
+
+  return null
+}

packages/core/src/systems/elevator/elevator-runtime.test.ts

@@ -0,0 +1,79 @@
+import { describe, expect, test } from 'bun:test'
+import type { AnyNodeId } from '../../schema'
+import { ElevatorNode } from '../../schema'
+import {
+  createElevatorInteractiveState,
+  openElevatorDoorState,
+  queueElevatorRequest,
+  stepElevatorRuntimeState,
+} from './elevator-runtime'
+import type { ElevatorLevelEntry } from './elevator-service'
+
+const groundLevelId = 'level_ground' as AnyNodeId
+const upperLevelId = 'level_upper' as AnyNodeId
+
+const entries: ElevatorLevelEntry[] = [
+  { id: groundLevelId as ElevatorLevelEntry['id'], label: '0', baseY: 0 },
+  { id: upperLevelId as ElevatorLevelEntry['id'], label: '1', baseY: 2.5 },
+]
+
+const elevator = ElevatorNode.parse({
+  speed: 10,
+  doorDurationMs: 100,
+  dwellMs: 0,
+})
+
+describe('elevator runtime helpers', () => {
+  test('queues level requests without duplicating the target', () => {
+    const state = createElevatorInteractiveState(groundLevelId, 0)
+    const queued = queueElevatorRequest(state, upperLevelId)
+    const duplicated = queueElevatorRequest(queued, upperLevelId)
+
+    expect(queued.queue).toEqual([upperLevelId])
+    expect(duplicated.queue).toEqual([upperLevelId])
+  })
+
+  test('opens doors only when the elevator is not moving', () => {
+    const idle = createElevatorInteractiveState(groundLevelId, 0)
+    const moving = { ...idle, phase: 'moving' as const }
+
+    expect(openElevatorDoorState(idle).phase).toBe('opening')
+    expect(openElevatorDoorState(moving)).toBe(moving)
+  })
+
+  test('moves to a queued level and clears the served request on arrival', () => {
+    const queued = queueElevatorRequest(createElevatorInteractiveState(groundLevelId, 0), upperLevelId)
+    const moving = stepElevatorRuntimeState({
+      defaultEntry: entries[0]!,
+      delta: 0.016,
+      elevator,
+      entries,
+      now: 0,
+      state: queued,
+    })
+
+    const arrived = stepElevatorRuntimeState({
+      defaultEntry: entries[0]!,
+      delta: 1,
+      elevator,
+      entries,
+      now: 100,
+      state: moving,
+    })
+
+    const open = stepElevatorRuntimeState({
+      defaultEntry: entries[0]!,
+      delta: 1,
+      elevator,
+      entries,
+      now: 200,
+      state: arrived,
+    })
+
+    expect(moving.phase).toBe('moving')
+    expect(arrived.currentLevelId).toBe(upperLevelId)
+    expect(arrived.phase).toBe('opening')
+    expect(open.phase).toBe('open')
+    expect(open.queue).toEqual([])
+  })
+})

packages/core/src/systems/elevator/elevator-runtime.ts

@@ -0,0 +1,265 @@
+import type { AnyNode, AnyNodeId, ElevatorNode } from '../../schema'
+import { type ElevatorInteractiveState, useInteractive } from '../../store/use-interactive'
+import useScene from '../../store/use-scene'
+import { resolveElevatorLevels, type ElevatorLevelEntry } from './elevator-service'
+
+const EPSILON = 0.001
+
+function moveToward(current: number, target: number, maxDelta: number) {
+  const delta = target - current
+  if (Math.abs(delta) <= maxDelta) return target
+  return current + Math.sign(delta) * maxDelta
+}
+
+export function createElevatorInteractiveState(
+  levelId: AnyNodeId,
+  carY: number,
+): ElevatorInteractiveState {
+  return {
+    currentLevelId: levelId,
+    targetLevelId: null,
+    carY,
+    doorOpen: 0,
+    phase: 'idle',
+    phaseStartedAt: null,
+    queue: [],
+  }
+}
+
+function getInitialElevatorState(
+  elevatorId: AnyNodeId,
+  nodes: Record<string, AnyNode>,
+): ElevatorInteractiveState | null {
+  const node = nodes[elevatorId]
+  if (node?.type !== 'elevator') return null
+
+  const { defaultEntry } = resolveElevatorLevels(node, nodes)
+  if (!defaultEntry) return null
+
+  return createElevatorInteractiveState(defaultEntry.id as AnyNodeId, defaultEntry.baseY)
+}
+
+function ensureElevatorState(
+  elevatorId: AnyNodeId,
+  nodes: Record<string, AnyNode>,
+): ElevatorInteractiveState | null {
+  const interactive = useInteractive.getState()
+  const existing = interactive.elevators[elevatorId]
+  if (existing) return existing
+
+  const initial = getInitialElevatorState(elevatorId, nodes)
+  if (!initial) return null
+
+  interactive.initElevator(elevatorId, initial.currentLevelId as AnyNodeId, initial.carY)
+  return initial
+}
+
+export function queueElevatorRequest(
+  state: ElevatorInteractiveState,
+  levelId: AnyNodeId,
+): ElevatorInteractiveState {
+  const isAlreadyQueued = state.queue.includes(levelId) || state.targetLevelId === levelId
+  if (isAlreadyQueued) return state
+
+  return {
+    ...state,
+    queue: [...state.queue, levelId],
+  }
+}
+
+export function openElevatorDoorState(
+  state: ElevatorInteractiveState,
+): ElevatorInteractiveState {
+  if (!state.currentLevelId || state.phase === 'moving') return state
+
+  return {
+    ...state,
+    phase: 'opening',
+    phaseStartedAt: null,
+  }
+}
+
+export function requestElevatorLevel(elevatorId: AnyNodeId, levelId: AnyNodeId) {
+  const nodes = useScene.getState().nodes
+  const current = ensureElevatorState(elevatorId, nodes)
+  if (!current) return
+
+  const next = queueElevatorRequest(current, levelId)
+  if (next === current) return
+
+  useInteractive.getState().setElevatorState(elevatorId, next)
+}
+
+export function openElevatorDoor(elevatorId: AnyNodeId) {
+  const nodes = useScene.getState().nodes
+  const current = ensureElevatorState(elevatorId, nodes)
+  if (!current) return
+
+  const next = openElevatorDoorState(current)
+  if (next === current) return
+
+  useInteractive.getState().setElevatorState(elevatorId, next)
+}
+
+export function stepElevatorRuntimeState({
+  defaultEntry,
+  delta,
+  elevator,
+  entries,
+  now,
+  state,
+}: {
+  defaultEntry: ElevatorLevelEntry
+  delta: number
+  elevator: ElevatorNode
+  entries: ElevatorLevelEntry[]
+  now: number
+  state: ElevatorInteractiveState
+}): ElevatorInteractiveState {
+  const currentEntry = entries.find((entry) => entry.id === state.currentLevelId) ?? defaultEntry
+  if (currentEntry.id !== state.currentLevelId) {
+    return {
+      ...state,
+      currentLevelId: currentEntry.id as AnyNodeId,
+      carY: currentEntry.baseY,
+      targetLevelId: null,
+      phase: 'idle',
+      phaseStartedAt: null,
+      queue: [],
+      doorOpen: 0,
+    }
+  }
+
+  const targetEntry = state.targetLevelId
+    ? entries.find((entry) => entry.id === state.targetLevelId)
+    : state.queue[0]
+      ? entries.find((entry) => entry.id === state.queue[0])
+      : null
+
+  const doorDurationMs = Math.max(elevator.doorDurationMs ?? 900, 1)
+  const doorStep = (delta * 1000) / doorDurationMs
+
+  switch (state.phase) {
+    case 'idle': {
+      const nextLevelId = state.queue[0] ?? null
+      if (!nextLevelId) {
+        if (state.doorOpen > EPSILON) {
+          return {
+            ...state,
+            doorOpen: Math.max(0, state.doorOpen - doorStep),
+          }
+        }
+        return state
+      }
+
+      return {
+        ...state,
+        targetLevelId: nextLevelId,
+        phase:
+          state.doorOpen > EPSILON
+            ? 'closing'
+            : nextLevelId === state.currentLevelId
+              ? 'opening'
+              : 'moving',
+        phaseStartedAt: now,
+      }
+    }
+
+    case 'closing': {
+      const doorOpen = Math.max(0, state.doorOpen - doorStep)
+      return {
+        ...state,
+        doorOpen,
+        phase: doorOpen <= EPSILON ? (state.targetLevelId ? 'moving' : 'idle') : 'closing',
+        phaseStartedAt: doorOpen <= EPSILON ? now : state.phaseStartedAt,
+      }
+    }
+
+    case 'moving': {
+      if (!targetEntry) {
+        return {
+          ...state,
+          targetLevelId: null,
+          phase: 'idle',
+          queue: [],
+        }
+      }
+
+      const speed = Math.max(elevator.speed ?? 2.2, 0.1)
+      const nextY = moveToward(state.carY, targetEntry.baseY, speed * delta)
+      const arrived = Math.abs(nextY - targetEntry.baseY) <= EPSILON
+      return {
+        ...state,
+        carY: nextY,
+        currentLevelId: arrived ? (targetEntry.id as AnyNodeId) : state.currentLevelId,
+        phase: arrived ? 'opening' : 'moving',
+        phaseStartedAt: arrived ? now : state.phaseStartedAt,
+      }
+    }
+
+    case 'opening': {
+      const doorOpen = Math.min(1, state.doorOpen + doorStep)
+      return {
+        ...state,
+        doorOpen,
+        phase: doorOpen >= 1 - EPSILON ? 'open' : 'opening',
+        phaseStartedAt: doorOpen >= 1 - EPSILON ? now : state.phaseStartedAt,
+        targetLevelId: doorOpen >= 1 - EPSILON ? null : state.targetLevelId,
+        queue:
+          doorOpen >= 1 - EPSILON && state.queue[0] === state.currentLevelId
+            ? state.queue.slice(1)
+            : state.queue,
+      }
+    }
+
+    case 'open': {
+      const elapsed = now - (state.phaseStartedAt ?? now)
+      if (elapsed < Math.max(elevator.dwellMs ?? 1400, 0)) return state
+
+      return {
+        ...state,
+        phase: 'closing',
+        phaseStartedAt: now,
+        targetLevelId: state.queue[0] ?? null,
+      }
+    }
+  }
+}
+
+export function stepElevatorRuntimes(now: number, delta: number) {
+  const nodes = useScene.getState().nodes
+  const interactive = useInteractive.getState()
+
+  for (const elevatorId of Object.keys(interactive.elevators)) {
+    const typedElevatorId = elevatorId as AnyNodeId
+    if (nodes[typedElevatorId]?.type !== 'elevator') {
+      interactive.removeElevator(typedElevatorId)
+    }
+  }
+
+  for (const node of Object.values(nodes)) {
+    if (node.type !== 'elevator') continue
+
+    const elevatorId = node.id as AnyNodeId
+    const { entries, defaultEntry } = resolveElevatorLevels(node, nodes)
+    if (!defaultEntry) continue
+
+    const state = useInteractive.getState().elevators[elevatorId]
+    if (!state) {
+      useInteractive.getState().initElevator(elevatorId, defaultEntry.id as AnyNodeId, defaultEntry.baseY)
+      continue
+    }
+
+    const next = stepElevatorRuntimeState({
+      defaultEntry,
+      delta,
+      elevator: node,
+      entries,
+      now,
+      state,
+    })
+    if (next !== state) {
+      useInteractive.getState().setElevatorState(elevatorId, next)
+    }
+  }
+}

packages/core/src/systems/elevator/elevator-service.ts

@@ -0,0 +1,150 @@
+import type { AnyNode, AnyNodeId, CeilingNode, ElevatorNode, LevelNode, WallNode } from '../../schema'
+
+export const DEFAULT_ELEVATOR_LEVEL_HEIGHT = 2.5
+
+export type ElevatorLevelEntry = {
+  id: LevelNode['id']
+  label: string
+  baseY: number
+}
+
+function getBuildingLevels(elevator: ElevatorNode, nodes: Record<string, AnyNode>): LevelNode[] {
+  const building =
+    elevator.parentId && nodes[elevator.parentId as AnyNodeId]?.type === 'building'
+      ? nodes[elevator.parentId as AnyNodeId]
+      : null
+
+  if (building?.type !== 'building') return []
+
+  return building.children
+    .map((childId) => nodes[childId as AnyNodeId])
+    .filter((node): node is LevelNode => node?.type === 'level')
+    .sort((left, right) => left.level - right.level)
+}
+
+function findLevelIndex(levels: LevelNode[], levelId: string | null | undefined) {
+  if (!levelId) return -1
+  return levels.findIndex((level) => level.id === levelId)
+}
+
+function getDefaultToIndex(levels: LevelNode[], fromIndex: number) {
+  if (levels.length === 0) return -1
+  if (fromIndex < 0) return Math.min(1, levels.length - 1)
+  return Math.min(fromIndex + 1, levels.length - 1)
+}
+
+export function resolveElevatorBuildingLevels(
+  elevator: ElevatorNode,
+  nodes: Record<string, AnyNode>,
+): LevelNode[] {
+  return getBuildingLevels(elevator, nodes)
+}
+
+export function resolveElevatorServiceLevelIds(
+  elevator: ElevatorNode,
+  nodes: Record<string, AnyNode>,
+): string[] {
+  return resolveElevatorServiceLevels(elevator, nodes).map((level) => level.id)
+}
+
+export function resolveElevatorServiceLevels(
+  elevator: ElevatorNode,
+  nodes: Record<string, AnyNode>,
+): LevelNode[] {
+  const levels = getBuildingLevels(elevator, nodes)
+  if (levels.length === 0) return []
+
+  const hasServiceBounds = Boolean(elevator.fromLevelId || elevator.toLevelId)
+  let legacyServedLevels: LevelNode[] = []
+  if (!hasServiceBounds && elevator.servedLevelIds && elevator.servedLevelIds.length > 0) {
+    const servedIds = new Set(elevator.servedLevelIds)
+    legacyServedLevels = levels.filter((level) => servedIds.has(level.id))
+  }
+
+  const legacyFromLevelId = legacyServedLevels[0]?.id ?? null
+  const legacyToLevelId = legacyServedLevels[legacyServedLevels.length - 1]?.id ?? null
+  const explicitFromIndex = findLevelIndex(levels, elevator.fromLevelId ?? legacyFromLevelId)
+  const defaultFromIndex = findLevelIndex(levels, elevator.defaultLevelId)
+  const fromIndex = explicitFromIndex >= 0 ? explicitFromIndex : Math.max(defaultFromIndex, 0)
+  const toIndex = findLevelIndex(levels, elevator.toLevelId ?? legacyToLevelId)
+  const resolvedToIndex = toIndex >= 0 ? toIndex : getDefaultToIndex(levels, fromIndex)
+  const minIndex = Math.min(fromIndex, resolvedToIndex)
+  const maxIndex = Math.max(fromIndex, resolvedToIndex)
+
+  return levels.slice(minIndex, maxIndex + 1)
+}
+
+export function getElevatorLevelHeight(levelId: string, nodes: Record<string, AnyNode>): number {
+  const level = nodes[levelId as AnyNodeId] as LevelNode | undefined
+  if (!level || level.type !== 'level') return DEFAULT_ELEVATOR_LEVEL_HEIGHT
+
+  let maxTop = 0
+
+  for (const childId of level.children) {
+    const child = nodes[childId as AnyNodeId]
+    if (!child) continue
+
+    if (child.type === 'ceiling') {
+      const height = (child as CeilingNode).height ?? DEFAULT_ELEVATOR_LEVEL_HEIGHT
+      if (height > maxTop) maxTop = height
+    } else if (child.type === 'wall') {
+      const height = (child as WallNode).height ?? DEFAULT_ELEVATOR_LEVEL_HEIGHT
+      if (height > maxTop) maxTop = height
+    }
+  }
+
+  return maxTop > 0 ? maxTop : DEFAULT_ELEVATOR_LEVEL_HEIGHT
+}
+
+export function resolveElevatorLevels(
+  elevator: ElevatorNode,
+  nodes: Record<string, AnyNode>,
+): {
+  entries: ElevatorLevelEntry[]
+  defaultEntry: ElevatorLevelEntry | null
+  shaftBaseY: number
+  shaftTopY: number
+  totalHeight: number
+} {
+  const allLevels = resolveElevatorBuildingLevels(elevator, nodes)
+
+  const baseYByLevelId = new Map<string, number>()
+  let cumulativeY = 0
+  for (const level of allLevels) {
+    baseYByLevelId.set(level.id, cumulativeY)
+    cumulativeY += getElevatorLevelHeight(level.id, nodes)
+  }
+
+  const serviceLevels = resolveElevatorServiceLevels(elevator, nodes)
+  const entries = serviceLevels.map((level) => ({
+    id: level.id,
+    label: String(level.level),
+    baseY: baseYByLevelId.get(level.id) ?? 0,
+  }))
+
+  const defaultEntry =
+    entries.find((entry) => entry.id === elevator.defaultLevelId) ??
+    entries.find((entry) => entry.id === elevator.fromLevelId) ??
+    entries[0] ??
+    null
+  const firstServedLevel = serviceLevels[0] ?? null
+  const lastServedLevel = serviceLevels[serviceLevels.length - 1] ?? null
+  const shaftBaseY = firstServedLevel ? (baseYByLevelId.get(firstServedLevel.id) ?? 0) : 0
+  const lastServedIndex = lastServedLevel
+    ? allLevels.findIndex((level) => level.id === lastServedLevel.id)
+    : -1
+  const nextLevel = lastServedIndex >= 0 ? allLevels[lastServedIndex + 1] : null
+  const shaftTopY = nextLevel
+    ? (baseYByLevelId.get(nextLevel.id) ?? cumulativeY)
+    : lastServedLevel
+      ? cumulativeY
+      : elevator.cabHeight + 0.3
+
+  return {
+    entries,
+    defaultEntry,
+    shaftBaseY,
+    shaftTopY,
+    totalHeight: Math.max(shaftTopY - shaftBaseY, elevator.cabHeight + 0.3),
+  }
+}

packages/core/src/systems/stair/stair-opening-sync.test.ts

@@ -1,6 +1,13 @@
 import { describe, expect, test } from 'bun:test'
 import type { AnyNode } from '../../schema'
-import { BuildingNode, LevelNode, SlabNode, StairNode, StairSegmentNode } from '../../schema'
+import {
+  BuildingNode,
+  CeilingNode,
+  LevelNode,
+  SlabNode,
+  StairNode,
+  StairSegmentNode,
+} from '../../schema'
 import { syncAutoStairOpenings } from './stair-opening-sync'
 
 describe('syncAutoStairOpenings', () => {
@@ -66,4 +73,190 @@ describe('syncAutoStairOpenings', () => {
     expect(landingUpdate?.data.holeMetadata).toEqual([{ source: 'stair', stairId: stair.id }])
     expect(bedroomUpdate).toBeUndefined()
   })
+
+  test('does not add stair holes when a manual surface hole already covers them', () => {
+    const building = BuildingNode.parse({ name: 'Building' })
+    const ground = LevelNode.parse({ name: 'Ground', level: 0, parentId: building.id })
+    const upper = LevelNode.parse({ name: 'Upper', level: 1, parentId: building.id })
+    const manualOpening: Array<[number, number]> = [
+      [1.2, 0.8],
+      [2.8, 0.8],
+      [2.8, 2.9],
+      [1.2, 2.9],
+    ]
+    const sourceCeiling = CeilingNode.parse({
+      name: 'Source Ceiling',
+      parentId: ground.id,
+      polygon: [
+        [0, 0],
+        [4, 0],
+        [4, 3],
+        [0, 3],
+      ],
+      holes: [manualOpening],
+      holeMetadata: [{ source: 'manual' }],
+    })
+    const landingSlab = SlabNode.parse({
+      name: 'Landing Slab',
+      parentId: upper.id,
+      polygon: [
+        [0, 0],
+        [4, 0],
+        [4, 3],
+        [0, 3],
+      ],
+      holes: [manualOpening],
+      holeMetadata: [{ source: 'manual' }],
+    })
+    const segment = StairSegmentNode.parse({
+      parentId: 'stair_main',
+      width: 1,
+      length: 2.6,
+      height: 2.5,
+      stepCount: 12,
+    })
+    const stair = StairNode.parse({
+      id: 'stair_main',
+      name: 'Main Stair',
+      parentId: ground.id,
+      position: [2, 0, 0.2],
+      stairType: 'straight',
+      fromLevelId: ground.id,
+      toLevelId: upper.id,
+      slabOpeningMode: 'destination',
+      children: [segment.id],
+    })
+    const nodes = Object.fromEntries(
+      [
+        building,
+        ground,
+        upper,
+        sourceCeiling,
+        landingSlab,
+        stair,
+        { ...segment, parentId: stair.id },
+      ].map((node) => [node.id, node]),
+    ) as Record<string, AnyNode>
+
+    const updates = syncAutoStairOpenings(nodes)
+
+    expect(updates.find((update) => update.id === landingSlab.id)).toBeUndefined()
+    expect(updates.find((update) => update.id === sourceCeiling.id)).toBeUndefined()
+  })
+
+  test('adds stair holes when an existing manual hole is too small', () => {
+    const building = BuildingNode.parse({ name: 'Building' })
+    const ground = LevelNode.parse({ name: 'Ground', level: 0, parentId: building.id })
+    const upper = LevelNode.parse({ name: 'Upper', level: 1, parentId: building.id })
+    const smallManualOpening: Array<[number, number]> = [
+      [1.8, 1.6],
+      [2.2, 1.6],
+      [2.2, 2.1],
+      [1.8, 2.1],
+    ]
+    const landingSlab = SlabNode.parse({
+      name: 'Landing Slab',
+      parentId: upper.id,
+      polygon: [
+        [0, 0],
+        [4, 0],
+        [4, 3],
+        [0, 3],
+      ],
+      holes: [smallManualOpening],
+      holeMetadata: [{ source: 'manual' }],
+    })
+    const segment = StairSegmentNode.parse({
+      parentId: 'stair_main',
+      width: 1,
+      length: 2.6,
+      height: 2.5,
+      stepCount: 12,
+    })
+    const stair = StairNode.parse({
+      id: 'stair_main',
+      name: 'Main Stair',
+      parentId: ground.id,
+      position: [2, 0, 0.2],
+      stairType: 'straight',
+      fromLevelId: ground.id,
+      toLevelId: upper.id,
+      slabOpeningMode: 'destination',
+      children: [segment.id],
+    })
+    const nodes = Object.fromEntries(
+      [building, ground, upper, landingSlab, stair, { ...segment, parentId: stair.id }].map(
+        (node) => [node.id, node],
+      ),
+    ) as Record<string, AnyNode>
+
+    const updates = syncAutoStairOpenings(nodes)
+    const landingUpdate = updates.find((update) => update.id === landingSlab.id)
+
+    expect(landingUpdate?.data.holes).toHaveLength(2)
+    expect(landingUpdate?.data.holes?.[0]).toEqual(smallManualOpening)
+    expect(landingUpdate?.data.holeMetadata).toEqual([
+      { source: 'manual' },
+      { source: 'stair', stairId: stair.id },
+    ])
+  })
+
+  test('removes stale auto stair holes when a manual hole overlaps the stair opening', () => {
+    const building = BuildingNode.parse({ name: 'Building' })
+    const ground = LevelNode.parse({ name: 'Ground', level: 0, parentId: building.id })
+    const upper = LevelNode.parse({ name: 'Upper', level: 1, parentId: building.id })
+    const manualOpening: Array<[number, number]> = [
+      [1.2, 0.8],
+      [2.8, 0.8],
+      [2.8, 2.9],
+      [1.2, 2.9],
+    ]
+    const staleAutoOpening: Array<[number, number]> = [
+      [1.5, 1],
+      [2.5, 1],
+      [2.5, 2.8],
+      [1.5, 2.8],
+    ]
+    const landingSlab = SlabNode.parse({
+      name: 'Landing Slab',
+      parentId: upper.id,
+      polygon: [
+        [0, 0],
+        [4, 0],
+        [4, 3],
+        [0, 3],
+      ],
+      holes: [manualOpening, staleAutoOpening],
+      holeMetadata: [{ source: 'manual' }, { source: 'stair', stairId: 'stair_main' }],
+    })
+    const segment = StairSegmentNode.parse({
+      parentId: 'stair_main',
+      width: 1,
+      length: 2.6,
+      height: 2.5,
+      stepCount: 12,
+    })
+    const stair = StairNode.parse({
+      id: 'stair_main',
+      name: 'Main Stair',
+      parentId: ground.id,
+      position: [2, 0, 0.2],
+      stairType: 'straight',
+      fromLevelId: ground.id,
+      toLevelId: upper.id,
+      slabOpeningMode: 'destination',
+      children: [segment.id],
+    })
+    const nodes = Object.fromEntries(
+      [building, ground, upper, landingSlab, stair, { ...segment, parentId: stair.id }].map(
+        (node) => [node.id, node],
+      ),
+    ) as Record<string, AnyNode>
+
+    const updates = syncAutoStairOpenings(nodes)
+    const landingUpdate = updates.find((update) => update.id === landingSlab.id)
+
+    expect(landingUpdate?.data.holes).toEqual([manualOpening])
+    expect(landingUpdate?.data.holeMetadata).toEqual([{ source: 'manual' }])
+  })
 })

packages/core/src/systems/stair/stair-opening-sync.ts

@@ -6,16 +6,12 @@ import type {
   SlabNode,
   StairNode,
   StairSegmentNode,
+  SurfaceHoleMetadata,
 } from '../../schema'
 import { DEFAULT_WALL_HEIGHT } from '../wall/wall-footprint'
 
 type Point2D = [number, number]
 
-type SurfaceHoleMetadata = {
-  source: 'manual' | 'stair'
-  stairId?: string
-}
-
 type SegmentTransform = {
   position: [number, number, number]
   rotation: number
@@ -66,6 +62,7 @@ function metadataEqual(left: SurfaceHoleMetadata[], right: SurfaceHoleMetadata[]
   return left.every(
     (entry, index) =>
       entry.source === right[index]?.source &&
+      (entry.elevatorId ?? null) === (right[index]?.elevatorId ?? null) &&
       (entry.stairId ?? null) === (right[index]?.stairId ?? null),
   )
 }
@@ -313,6 +310,10 @@ function polygonContainsPolygon(outer: Point2D[], inner: Point2D[]) {
   return inner.every((point) => pointInPolygon(point, outer))
 }
 
+function isCoveredByExistingHole(existingHoles: Point2D[][], autoHole: Point2D[]) {
+  return existingHoles.some((existingHole) => polygonContainsPolygon(existingHole, autoHole))
+}
+
 function getAxisAlignedRectFromPolygon(polygon: Point2D[]): AxisAlignedRect | null {
   if (polygon.length < 4) return null
   const xs = polygon.map(([x]) => x)
@@ -689,12 +690,10 @@ export function syncAutoStairOpenings(nodes: Record<string, AnyNode>) {
     const slabLevelId = resolveLevelId(slab, nodes)
     const existingHoles = slab.holes ?? []
     const existingMetadata = normalizeExistingMetadata(existingHoles, slab.holeMetadata)
-    const manualHoles = existingHoles.filter(
-      (_hole, index) => existingMetadata[index]?.source !== 'stair',
-    )
-    const manualMetadata = existingMetadata
-      .filter((entry) => entry.source !== 'stair')
-      .map((entry) => ({ ...entry }))
+    const preservedHoles = existingHoles
+      .map((polygon, index) => ({ metadata: existingMetadata[index]!, polygon }))
+      .filter((entry) => entry.metadata.source !== 'stair')
+    const preservedHolePolygons = preservedHoles.map((entry) => entry.polygon)
 
     const stairHoles = stairs
       .filter((stair) => shouldApplyStairToSlab(stair, slabLevelId, nodes))
@@ -718,9 +717,16 @@ export function syncAutoStairOpenings(nodes: Record<string, AnyNode>) {
         })),
       )
       .filter((hole) => polygonContainsPolygon(slab.polygon, hole.polygon))
+      .filter((hole) => !isCoveredByExistingHole(preservedHolePolygons, hole.polygon))
 
-    const nextHoles = [...manualHoles, ...stairHoles.map((hole) => hole.polygon)]
-    const nextMetadata = [...manualMetadata, ...stairHoles.map((hole) => hole.metadata)]
+    const nextHoles = [
+      ...preservedHoles.map((hole) => hole.polygon),
+      ...stairHoles.map((hole) => hole.polygon),
+    ]
+    const nextMetadata = [
+      ...preservedHoles.map((hole) => ({ ...hole.metadata })),
+      ...stairHoles.map((hole) => hole.metadata),
+    ]
 
     if (
       !(polygonsEqual(existingHoles, nextHoles) && metadataEqual(existingMetadata, nextMetadata))
@@ -739,12 +745,10 @@ export function syncAutoStairOpenings(nodes: Record<string, AnyNode>) {
     const ceilingLevelId = resolveLevelId(ceiling, nodes)
     const existingHoles = ceiling.holes ?? []
     const existingMetadata = normalizeExistingMetadata(existingHoles, ceiling.holeMetadata)
-    const manualHoles = existingHoles.filter(
-      (_hole, index) => existingMetadata[index]?.source !== 'stair',
-    )
-    const manualMetadata = existingMetadata
-      .filter((entry) => entry.source !== 'stair')
-      .map((entry) => ({ ...entry }))
+    const preservedHoles = existingHoles
+      .map((polygon, index) => ({ metadata: existingMetadata[index]!, polygon }))
+      .filter((entry) => entry.metadata.source !== 'stair')
+    const preservedHolePolygons = preservedHoles.map((entry) => entry.polygon)
 
     const stairHoles = stairs
       .filter((stair) => shouldApplyStairToCeiling(stair, ceilingLevelId, nodes))
@@ -768,9 +772,16 @@ export function syncAutoStairOpenings(nodes: Record<string, AnyNode>) {
         })),
       )
       .filter((hole) => polygonContainsPolygon(ceiling.polygon, hole.polygon))
+      .filter((hole) => !isCoveredByExistingHole(preservedHolePolygons, hole.polygon))
 
-    const nextHoles = [...manualHoles, ...stairHoles.map((hole) => hole.polygon)]
-    const nextMetadata = [...manualMetadata, ...stairHoles.map((hole) => hole.metadata)]
+    const nextHoles = [
+      ...preservedHoles.map((hole) => hole.polygon),
+      ...stairHoles.map((hole) => hole.polygon),
+    ]
+    const nextMetadata = [
+      ...preservedHoles.map((hole) => ({ ...hole.metadata })),
+      ...stairHoles.map((hole) => hole.metadata),
+    ]
 
     if (
       !(polygonsEqual(existingHoles, nextHoles) && metadataEqual(existingMetadata, nextMetadata))

packages/editor/src/components/editor-2d/floorplan-action-menu-layer.tsx

@@ -21,6 +21,7 @@ export type FloorplanActionMenuEntry = {
 }
 
 type FloorplanActionMenuLayerProps = {
+  elevator: FloorplanActionMenuEntry
   item: FloorplanActionMenuEntry
   wall: FloorplanActionMenuEntry
   fence: FloorplanActionMenuEntry
@@ -34,6 +35,7 @@ type FloorplanActionMenuLayerProps = {
 }
 
 export const FloorplanActionMenuLayer = memo(function FloorplanActionMenuLayer({
+  elevator,
   item,
   wall,
   fence,
@@ -56,6 +58,7 @@ export const FloorplanActionMenuLayer = memo(function FloorplanActionMenuLayer({
   }
 
   const entries: FloorplanActionMenuEntry[] = [
+    elevator,
     item,
     wall,
     fence,

packages/editor/src/components/editor/first-person-controls.tsx

@@ -1,12 +1,50 @@
 'use client'
 
 import '../../three-types'
-import { type AnyNodeId, emitter, sceneRegistry, useInteractive, useScene } from '@pascal-app/core'
+import {
+  type AnyNode,
+  type AnyNodeId,
+  type ElevatorNode,
+  type ElevatorDoorSide,
+  emitter,
+  getElevatorCabCenterZ,
+  getElevatorCabDepth,
+  getElevatorCabWidth,
+  getElevatorDoorLeafSides,
+  getElevatorDoorLeafWidth,
+  getElevatorDoorLeafX,
+  getElevatorShaftDepth,
+  getElevatorShaftWallThickness,
+  getElevatorShaftWidth,
+  getResolvedElevatorDoorStyle,
+  openElevatorDoor,
+  resolveElevatorBuildingLevels,
+  resolveElevatorDispatchTarget,
+  resolveElevatorServiceLevels,
+  requestElevatorLevel,
+  sceneRegistry,
+  useInteractive,
+  useScene,
+} from '@pascal-app/core'
 import { useViewer } from '@pascal-app/viewer'
 import { KeyboardControls } from '@react-three/drei'
 import { useFrame, useThree } from '@react-three/fiber'
 import { useCallback, useEffect, useMemo, useRef, useState } from 'react'
-import { Box3, Euler, Matrix4, Ray, Raycaster, Vector2, Vector3 } from 'three'
+import {
+  Box3,
+  BoxGeometry,
+  Euler,
+  type Group,
+  Matrix4,
+  Mesh,
+  MeshBasicMaterial,
+  type Object3D,
+  Ray,
+  Raycaster,
+  Vector2,
+  Vector3,
+} from 'three'
+import { acceleratedRaycast, computeBoundsTree, disposeBoundsTree } from 'three-mesh-bvh'
 import {
   closeDoorOpenState,
   DOOR_SWING_OPEN_ANGLE,
@@ -34,6 +72,12 @@ const LOOK_SENSITIVITY = 0.002
 const CONTROLLER_CENTER_FROM_EYE = 0.85
 const DOOR_INTERACTION_DISTANCE = 2.5
 const DOOR_LEAF_INTERACTION_DEPTH = 0.08
+const ELEVATOR_RIDE_HORIZONTAL_PADDING = 0.18
+const ELEVATOR_COLLIDER_HORIZONTAL_PADDING = 0.14
+const ELEVATOR_COLLIDER_FLOOR_THICKNESS = 0.08
+const ELEVATOR_COLLIDER_DOOR_DEPTH = 0.12
+const ELEVATOR_ENTRY_DOOR_OPEN_THRESHOLD = 0.72
+const DEFAULT_ELEVATOR_LEVEL_HEIGHT = 2.5
 const keyboardMap = [
   { name: 'forward', keys: ['ArrowUp', 'KeyW'] },
   { name: 'backward', keys: ['ArrowDown', 'KeyS'] },
@@ -59,14 +103,422 @@ const doorOpeningLocalHit = new Vector3()
 const doorOpeningLocalRay = new Ray()
 const doorOpeningMatrix = new Matrix4()
 const doorOpeningWorldHit = new Vector3()
+const elevatorLocalControllerPosition = new Vector3()
+const elevatorInteractionRaycaster = new Raycaster()
+const elevatorColliderMatrix = new Matrix4()
+const elevatorColliderLocalMatrix = new Matrix4()
+const elevatorLocalEyePosition = new Vector3()
+const elevatorWorldControllerPosition = new Vector3()
+const elevatorColliderMaterial = new MeshBasicMaterial({ visible: false })
 const spawnWorldPosition = new Vector3()
 const spawnWorldEuler = new Euler(0, 0, 0, 'YXZ')
 const windowInteractionRaycaster = new Raycaster()
 
-type FirstPersonInteractableTarget = {
+type ElevatorColliderKind =
+  | 'cab-back'
+  | 'cab-ceiling'
+  | 'cab-door-left'
+  | 'cab-door-right'
+  | 'cab-door-gate'
+  | 'cab-floor'
+  | 'cab-left'
+  | 'cab-right'
+  | 'landing-door-gate'
+  | 'landing-door-left'
+  | 'landing-door-right'
+  | 'shaft-back'
+  | 'shaft-front-header'
+  | 'shaft-front-left'
+  | 'shaft-front-right'
+  | 'shaft-left'
+  | 'shaft-right'
+  | 'shaft-top'
+
+type ElevatorColliderUserData = {
+  doorWidth?: number
+  dynamic?: boolean
+  elevatorId: AnyNodeId
+  kind: ElevatorColliderKind
+  levelId?: AnyNodeId
+  localPosition: [number, number, number]
+  matrixInitialized?: boolean
+  side?: ElevatorDoorSide
+}
+
+type ElevatorColliderMesh = Mesh & {
+  userData: Mesh['userData'] & ElevatorColliderUserData
+}
+
+type FirstPersonInteractableTarget =
+  | {
       id: AnyNodeId
       type: 'door' | 'window'
     }
+  | {
+      action: 'open-door' | 'request-level'
+      buttonKind: 'cab' | 'landing'
+      id: AnyNodeId
+      levelId?: AnyNodeId
+      type: 'elevator'
+    }
+
+type ElevatorButtonTarget = {
+  action: 'open-door' | 'request-level'
+  buttonKind: 'cab' | 'landing'
+  elevatorId: AnyNodeId
+  levelId?: AnyNodeId
+}
+
+function resolveElevatorButtonTarget(object: Object3D): ElevatorButtonTarget | null {
+  let current: Object3D | null = object
+
+  while (current) {
+    const candidate = (
+      current.userData as {
+        elevatorButton?: {
+          action?: unknown
+          disabled?: unknown
+          elevatorId?: unknown
+          kind?: unknown
+          levelId?: unknown
+        }
+      }
+    ).elevatorButton
+
+    if (candidate?.disabled === true) {
+      return null
+    }
+
+    if (typeof candidate?.elevatorId === 'string' && candidate.kind === 'cab') {
+      const action = candidate.action === 'open-door' ? 'open-door' : 'request-level'
+      if (action === 'open-door') {
+        return {
+          action,
+          buttonKind: candidate.kind,
+          elevatorId: candidate.elevatorId as AnyNodeId,
+        }
+      }
+    }
+
+    if (
+      typeof candidate?.elevatorId === 'string' &&
+      typeof candidate.levelId === 'string' &&
+      (candidate.kind === 'cab' || candidate.kind === 'landing')
+    ) {
+      return {
+        action: 'request-level',
+        buttonKind: candidate.kind,
+        elevatorId: candidate.elevatorId as AnyNodeId,
+        levelId: candidate.levelId as AnyNodeId,
+      }
+    }
+
+    current = current.parent
+  }
+
+  return null
+}
+
+function getInteractableTargetKey(target: FirstPersonInteractableTarget | null) {
+  if (!target) return null
+  return target.type === 'elevator'
+    ? `${target.type}:${target.id}:${target.levelId}`
+    : `${target.type}:${target.id}`
+}
+
+function isDynamicElevatorCollider(kind: ElevatorColliderKind) {
+  return kind.startsWith('cab-') || kind.startsWith('landing-door')
+}
+
+function isInsideElevatorCab(
+  elevator: ElevatorNode,
+  runtime: NonNullable<ReturnType<typeof useInteractive.getState>['elevators'][AnyNodeId]>,
+  localEyePosition: Vector3,
+) {
+  const halfWidth = getElevatorCabWidth(elevator) / 2 - ELEVATOR_RIDE_HORIZONTAL_PADDING
+  const halfDepth = getElevatorCabDepth(elevator) / 2 - ELEVATOR_RIDE_HORIZONTAL_PADDING
+  const cabCenterZ = getElevatorCabCenterZ(elevator)
+  const cabHeight = Math.max(elevator.cabHeight, 1.4)
+
+  return (
+    Math.abs(localEyePosition.x) <= Math.max(halfWidth, 0.24) &&
+    Math.abs(localEyePosition.z - cabCenterZ) <= Math.max(halfDepth, 0.24) &&
+    localEyePosition.y >= runtime.carY + 0.35 &&
+    localEyePosition.y <= runtime.carY + cabHeight + 0.7
+  )
+}
+
+function getFirstPersonLevelHeight(levelId: string, nodes: Record<string, AnyNode>) {
+  const level = nodes[levelId as AnyNodeId]
+  if (level?.type !== 'level') return DEFAULT_ELEVATOR_LEVEL_HEIGHT
+
+  let maxTop = 0
+  for (const childId of level.children) {
+    const child = nodes[childId as AnyNodeId]
+    if (!child) continue
+
+    if (child.type === 'ceiling') {
+      maxTop = Math.max(maxTop, child.height ?? DEFAULT_ELEVATOR_LEVEL_HEIGHT)
+      continue
+    }
+
+    if (child.type === 'wall') {
+      const meshY = Math.max(sceneRegistry.nodes.get(childId as AnyNodeId)?.position.y ?? 0, 0)
+      maxTop = Math.max(maxTop, meshY + (child.height ?? DEFAULT_ELEVATOR_LEVEL_HEIGHT))
+    }
+  }
+
+  return maxTop > 0 ? maxTop : DEFAULT_ELEVATOR_LEVEL_HEIGHT
+}
+
+function resolveElevatorColliderLevels(elevator: ElevatorNode, nodes: Record<string, AnyNode>) {
+  const allLevels = resolveElevatorBuildingLevels(elevator, nodes)
+
+  const baseYByLevelId = new Map<string, number>()
+  let cumulativeY = 0
+  for (const level of allLevels) {
+    baseYByLevelId.set(level.id, cumulativeY)
+    cumulativeY += getFirstPersonLevelHeight(level.id, nodes)
+  }
+
+  const serviceLevels = resolveElevatorServiceLevels(elevator, nodes)
+  const entries = serviceLevels.map((level) => ({
+    baseY: baseYByLevelId.get(level.id) ?? 0,
+    id: level.id as AnyNodeId,
+  }))
+  const firstServedLevel = serviceLevels[0] ?? null
+  const lastServedLevel = serviceLevels[serviceLevels.length - 1] ?? null
+  const shaftBaseY = firstServedLevel ? (baseYByLevelId.get(firstServedLevel.id) ?? 0) : 0
+  const lastServedIndex = lastServedLevel
+    ? allLevels.findIndex((level) => level.id === lastServedLevel.id)
+    : -1
+  const nextLevel = lastServedIndex >= 0 ? allLevels[lastServedIndex + 1] : null
+  const shaftTopY = nextLevel
+    ? (baseYByLevelId.get(nextLevel.id) ?? cumulativeY)
+    : lastServedLevel
+      ? cumulativeY
+      : elevator.cabHeight + 0.3
+
+  return {
+    entries,
+    shaftBaseY,
+    shaftTopY,
+    totalHeight: Math.max(shaftTopY - shaftBaseY, elevator.cabHeight + 0.3),
+  }
+}
+
+function createElevatorColliderMesh(
+  elevatorId: AnyNodeId,
+  kind: ElevatorColliderKind,
+  size: [number, number, number],
+  localPosition: [number, number, number],
+  userData: Partial<ElevatorColliderUserData> = {},
+) {
+  const geometry = new BoxGeometry(size[0], size[1], size[2])
+
+  const bvhGeometry = geometry as typeof geometry & {
+    computeBoundsTree?: typeof computeBoundsTree
+    disposeBoundsTree?: typeof disposeBoundsTree
+  }
+  ;(bvhGeometry as any).computeBoundsTree = computeBoundsTree
+  ;(bvhGeometry as any).disposeBoundsTree = disposeBoundsTree
+  bvhGeometry.computeBoundsTree?.({
+    maxLeafSize: 12,
+    strategy: 0,
+  } as never)
+  bvhGeometry.computeBoundingBox()
+
+  const mesh = new Mesh(bvhGeometry, elevatorColliderMaterial) as unknown as ElevatorColliderMesh
+  mesh.raycast = acceleratedRaycast
+  mesh.matrixAutoUpdate = false
+  mesh.visible = true
+  mesh.userData = {
+    ...userData,
+    dynamic: isDynamicElevatorCollider(kind),
+    elevatorId,
+    excludeCollisionCheck: false,
+    excludeFloatHit: false,
+    friction: 0.8,
+    kind,
+    localPosition,
+    matrixInitialized: false,
+    restitution: 0.03,
+    type: 'ELEVATOR_COLLIDER',
+  }
+  return mesh
+}
+
+function buildElevatorColliderMeshes(): ElevatorColliderMesh[] {
+  const nodes = useScene.getState().nodes
+  const meshes: ElevatorColliderMesh[] = []
+
+  for (const elevatorId of sceneRegistry.byType.elevator) {
+    const typedElevatorId = elevatorId as AnyNodeId
+    const node = nodes[typedElevatorId]
+    if (node?.type !== 'elevator' || node.visible === false) continue
+
+    const { entries, shaftBaseY, shaftTopY, totalHeight } = resolveElevatorColliderLevels(
+      node,
+      nodes,
+    )
+    const cabWidth = getElevatorCabWidth(node)
+    const cabDepth = getElevatorCabDepth(node)
+    const shaftWidth = getElevatorShaftWidth(node, cabWidth)
+    const shaftDepth = getElevatorShaftDepth(node, cabDepth)
+    const cabHeight = Math.max(node.cabHeight, 1.4)
+    const doorWidth = Math.min(Math.max(node.doorWidth, 0.45), cabWidth - 0.18, shaftWidth - 0.18)
+    const doorHeight = Math.min(Math.max(node.doorHeight, 1.2), cabHeight - 0.1)
+    const doorStyle = getResolvedElevatorDoorStyle(node.doorStyle)
+    const shaftHeight = Math.max(totalHeight, cabHeight + 0.3)
+    const wallThickness = getElevatorShaftWallThickness(node)
+    const cabFloorWidth = Math.max(cabWidth - ELEVATOR_COLLIDER_HORIZONTAL_PADDING * 2, 0.48)
+    const cabFloorDepth = Math.max(cabDepth - ELEVATOR_COLLIDER_HORIZONTAL_PADDING * 2, 0.48)
+    const frontWallZ = -shaftDepth / 2 - wallThickness / 2
+    const frontZ = frontWallZ - wallThickness / 2 - 0.018
+    const cabCenterZ = -shaftDepth / 2 + cabDepth / 2
+    const leafWidth = getElevatorDoorLeafWidth(doorWidth, doorStyle)
+    const doorLeafSides = getElevatorDoorLeafSides(doorStyle)
+    const resolvedShaftTopY = Math.max(shaftTopY, shaftBaseY + shaftHeight)
+
+    meshes.push(
+      createElevatorColliderMesh(
+        typedElevatorId,
+        'shaft-back',
+        [shaftWidth + wallThickness * 2, shaftHeight, wallThickness],
+        [0, shaftBaseY + shaftHeight / 2, shaftDepth / 2 + wallThickness / 2],
+      ),
+      createElevatorColliderMesh(
+        typedElevatorId,
+        'shaft-left',
+        [wallThickness, shaftHeight, shaftDepth + wallThickness * 2],
+        [-shaftWidth / 2 - wallThickness / 2, shaftBaseY + shaftHeight / 2, 0],
+      ),
+      createElevatorColliderMesh(
+        typedElevatorId,
+        'shaft-right',
+        [wallThickness, shaftHeight, shaftDepth + wallThickness * 2],
+        [shaftWidth / 2 + wallThickness / 2, shaftBaseY + shaftHeight / 2, 0],
+      ),
+      createElevatorColliderMesh(
+        typedElevatorId,
+        'shaft-top',
+        [shaftWidth + wallThickness * 2, wallThickness, shaftDepth + wallThickness * 2],
+        [0, shaftBaseY + shaftHeight - wallThickness / 2, 0],
+      ),
+      createElevatorColliderMesh(
+        typedElevatorId,
+        'cab-floor',
+        [cabFloorWidth, ELEVATOR_COLLIDER_FLOOR_THICKNESS, cabFloorDepth],
+        [0, ELEVATOR_COLLIDER_FLOOR_THICKNESS / 2, cabCenterZ],
+      ),
+      createElevatorColliderMesh(
+        typedElevatorId,
+        'cab-ceiling',
+        [cabWidth, wallThickness, cabDepth],
+        [0, cabHeight - wallThickness / 2, cabCenterZ],
+      ),
+      createElevatorColliderMesh(
+        typedElevatorId,
+        'cab-back',
+        [cabWidth, cabHeight, wallThickness],
+        [0, cabHeight / 2, cabCenterZ + cabDepth / 2 - wallThickness / 2],
+      ),
+      createElevatorColliderMesh(
+        typedElevatorId,
+        'cab-left',
+        [wallThickness, cabHeight, cabDepth],
+        [-cabWidth / 2 + wallThickness / 2, cabHeight / 2, cabCenterZ],
+      ),
+      createElevatorColliderMesh(
+        typedElevatorId,
+        'cab-right',
+        [wallThickness, cabHeight, cabDepth],
+        [cabWidth / 2 - wallThickness / 2, cabHeight / 2, cabCenterZ],
+      ),
+      createElevatorColliderMesh(
+        typedElevatorId,
+        'cab-door-gate',
+        [doorWidth, doorHeight, ELEVATOR_COLLIDER_DOOR_DEPTH],
+        [0, doorHeight / 2, frontZ],
+        { doorWidth },
+      ),
+      ...doorLeafSides.map((side) =>
+        createElevatorColliderMesh(
+          typedElevatorId,
+          side === 'left' ? 'cab-door-left' : 'cab-door-right',
+          [leafWidth, doorHeight, ELEVATOR_COLLIDER_DOOR_DEPTH],
+          [0, doorHeight / 2, frontZ],
+          { doorWidth, side },
+        ),
+      ),
+    )
+
+    const entrySpans = entries.map((entry, index) => {
+      const nextEntry = entries[index + 1]
+      return {
+        entry,
+        levelTopY: Math.max(nextEntry?.baseY ?? resolvedShaftTopY, entry.baseY + doorHeight + 0.24),
+      }
+    })
+
+    for (const { entry, levelTopY } of entrySpans) {
+      const wallDepth = wallThickness
+      const levelHeight = Math.max(levelTopY - entry.baseY, doorHeight + 0.24)
+      const jambWidth = Math.max((shaftWidth - doorWidth) / 2, 0.08)
+      const jambCenterOffset = doorWidth / 2 + jambWidth / 2
+      const headerHeight = Math.max(levelHeight - doorHeight, 0.14)
+
+      meshes.push(
+        createElevatorColliderMesh(
+          typedElevatorId,
+          'shaft-front-left',
+          [jambWidth, levelHeight, wallDepth],
+          [-jambCenterOffset, entry.baseY + levelHeight / 2, frontWallZ],
+        ),
+        createElevatorColliderMesh(
+          typedElevatorId,
+          'shaft-front-right',
+          [jambWidth, levelHeight, wallDepth],
+          [jambCenterOffset, entry.baseY + levelHeight / 2, frontWallZ],
+        ),
+        createElevatorColliderMesh(
+          typedElevatorId,
+          'shaft-front-header',
+          [shaftWidth, headerHeight, wallDepth],
+          [0, entry.baseY + doorHeight + headerHeight / 2, frontWallZ],
+        ),
+        createElevatorColliderMesh(
+          typedElevatorId,
+          'landing-door-gate',
+          [doorWidth, doorHeight, ELEVATOR_COLLIDER_DOOR_DEPTH],
+          [0, entry.baseY + doorHeight / 2, frontZ - 0.02],
+          { doorWidth, levelId: entry.id },
+        ),
+        ...doorLeafSides.map((side) =>
+          createElevatorColliderMesh(
+            typedElevatorId,
+            side === 'left' ? 'landing-door-left' : 'landing-door-right',
+            [leafWidth, doorHeight, ELEVATOR_COLLIDER_DOOR_DEPTH],
+            [0, entry.baseY + doorHeight / 2, frontZ - 0.02],
+            { doorWidth, levelId: entry.id, side },
+          ),
+        ),
+      )
+    }
+  }
+
+  return meshes
+}
+
+function disposeElevatorColliderMeshes(meshes: ElevatorColliderMesh[]) {
+  for (const mesh of meshes) {
+    const geometry = mesh.geometry as typeof mesh.geometry & {
+      disposeBoundsTree?: typeof disposeBoundsTree
+    }
+    geometry.disposeBoundsTree?.()
+    geometry.dispose()
+  }
+}
 
 const resolvePlacedSpawnNode = (
   nodes: ReturnType<typeof useScene.getState>['nodes'],
@@ -86,8 +538,17 @@ export const FirstPersonControls = () => {
   const yawRef = useRef(0)
   const pitchRef = useRef(0)
   const interactableTargetRef = useRef<FirstPersonInteractableTarget | null>(null)
+  const [isElevatorRideLocked, setIsElevatorRideLocked] = useState(false)
+  const ridingElevatorRef = useRef<{
+    elevatorId: AnyNodeId
+    localControllerY: number | null
+    previousCarY: number
+  } | null>(null)
+  const rideLockedRef = useRef(false)
   const worldRef = useRef<FirstPersonColliderWorld | null>(null)
+  const elevatorColliderMeshesRef = useRef<ElevatorColliderMesh[]>([])
   const [world, setWorld] = useState<FirstPersonColliderWorld | null>(null)
+  const [elevatorColliderMeshes, setElevatorColliderMeshes] = useState<ElevatorColliderMesh[]>([])
   const [controllerStart, setControllerStart] = useState<{
     position: [number, number, number]
     yaw: number
@@ -99,9 +560,22 @@ export const FirstPersonControls = () => {
     setWorld(nextWorld)
   }, [])
 
+  const replaceElevatorColliderMeshes = useCallback((nextMeshes: ElevatorColliderMesh[]) => {
+    disposeElevatorColliderMeshes(elevatorColliderMeshesRef.current)
+    elevatorColliderMeshesRef.current = nextMeshes
+    setElevatorColliderMeshes(nextMeshes)
+  }, [])
+
   const rebuildColliderWorld = useCallback(() => {
     replaceColliderWorld(buildFirstPersonColliderWorldFromRegistry())
-  }, [replaceColliderWorld])
+    replaceElevatorColliderMeshes(buildElevatorColliderMeshes())
+  }, [replaceColliderWorld, replaceElevatorColliderMeshes])
+
+  const setElevatorRideLocked = useCallback((locked: boolean) => {
+    if (rideLockedRef.current === locked) return
+    rideLockedRef.current = locked
+    setIsElevatorRideLocked(locked)
+  }, [])
 
   const resolveInteractableDoorId = useCallback((): AnyNodeId | null => {
     const nodes = useScene.getState().nodes
@@ -230,7 +704,61 @@ export const FirstPersonControls = () => {
     return closestWindowId
   }, [camera])
 
+  const resolveInteractableElevatorTarget =
+    useCallback((): FirstPersonInteractableTarget | null => {
+      const nodes = useScene.getState().nodes
+      camera.updateMatrixWorld(true)
+      elevatorInteractionRaycaster.setFromCamera(centerScreenPoint, camera)
+
+      let closestTarget: FirstPersonInteractableTarget | null = null
+      let closestDistance = DOOR_INTERACTION_DISTANCE
+
+      for (const elevatorId of sceneRegistry.byType.elevator) {
+        const typedElevatorId = elevatorId as AnyNodeId
+        const node = nodes[typedElevatorId]
+        if (node?.type !== 'elevator') continue
+
+        const object = sceneRegistry.nodes.get(typedElevatorId)
+        if (!object) continue
+
+        const runtime = useInteractive.getState().elevators[typedElevatorId]
+        object.updateWorldMatrix(true, true)
+        if (runtime) {
+          elevatorLocalEyePosition.copy(camera.position)
+          object.worldToLocal(elevatorLocalEyePosition)
+        }
+        const canUseCabButtons =
+          runtime && isInsideElevatorCab(node, runtime, elevatorLocalEyePosition)
+
+        const intersections = elevatorInteractionRaycaster.intersectObject(object, true)
+        for (const intersection of intersections) {
+          if (intersection.distance > closestDistance) continue
+
+          const target = resolveElevatorButtonTarget(intersection.object)
+          if (!target || target.elevatorId !== elevatorId) continue
+          if (target.action === 'request-level') {
+            if (!target.levelId || nodes[target.levelId]?.type !== 'level') continue
+          }
+          if (target.buttonKind === 'cab' && !canUseCabButtons) continue
+
+          closestTarget = {
+            action: target.action,
+            buttonKind: target.buttonKind,
+            id: target.elevatorId,
+            levelId: target.levelId,
+            type: 'elevator',
+          }
+          closestDistance = intersection.distance
+        }
+      }
+
+      return closestTarget
+    }, [camera])
+
   const resolveInteractableTarget = useCallback((): FirstPersonInteractableTarget | null => {
+    const elevatorTarget = resolveInteractableElevatorTarget()
+    if (elevatorTarget) return elevatorTarget
+
     const doorId = resolveInteractableDoorId()
     if (doorId) return { id: doorId, type: 'door' }
 
@@ -238,12 +766,42 @@ export const FirstPersonControls = () => {
     if (windowId) return { id: windowId, type: 'window' }
 
     return null
-  }, [resolveInteractableDoorId, resolveInteractableWindowId])
+  }, [resolveInteractableDoorId, resolveInteractableElevatorTarget, resolveInteractableWindowId])
 
   const toggleInteractableTarget = useCallback(() => {
     const target = interactableTargetRef.current ?? resolveInteractableTarget()
     if (!target) return
 
+    if (target.type === 'elevator') {
+      if (target.buttonKind === 'cab') {
+        const state = useInteractive.getState().elevators[target.id]
+        if (state) {
+          ridingElevatorRef.current = {
+            elevatorId: target.id,
+            localControllerY: null,
+            previousCarY: state.carY,
+          }
+        }
+      }
+      if (target.action === 'open-door') {
+        openElevatorDoor(target.id)
+        return
+      }
+      if (target.levelId) {
+        const targetElevatorId =
+          target.buttonKind === 'landing'
+            ? resolveElevatorDispatchTarget({
+                elevators: useInteractive.getState().elevators,
+                levelId: target.levelId,
+                nodes: useScene.getState().nodes,
+                requestedElevatorId: target.id,
+              })
+            : target.id
+        requestElevatorLevel(targetElevatorId, target.levelId)
+      }
+      return
+    }
+
     if (target.type === 'window') {
       const node = useScene.getState().nodes[target.id]
       if (
@@ -270,6 +828,8 @@ export const FirstPersonControls = () => {
     const target = interactableTargetRef.current ?? resolveInteractableTarget()
     if (!target) return
 
+    if (target.type === 'elevator') return
+
     if (target.type === 'window') {
       const node = useScene.getState().nodes[target.id]
       if (
@@ -325,6 +885,9 @@ export const FirstPersonControls = () => {
     return () => {
       worldRef.current?.dispose()
       worldRef.current = null
+      disposeElevatorColliderMeshes(elevatorColliderMeshesRef.current)
+      elevatorColliderMeshesRef.current = []
+      setElevatorColliderMeshes([])
       setWorld(null)
     }
   }, [rebuildColliderWorld])
@@ -373,17 +936,28 @@ export const FirstPersonControls = () => {
       }
     }
 
+    const handleMouseDown = (event: MouseEvent) => {
+      if (document.pointerLockElement !== canvas) return
+      if (event.button !== 0) return
+
+      event.preventDefault()
+      event.stopPropagation()
+      toggleInteractableTarget()
+    }
+
     document.addEventListener('mousemove', handleMouseMove)
     document.addEventListener('click', handleClick)
+    document.addEventListener('mousedown', handleMouseDown, true)
 
     return () => {
       document.removeEventListener('mousemove', handleMouseMove)
       document.removeEventListener('click', handleClick)
+      document.removeEventListener('mousedown', handleMouseDown, true)
       if (document.pointerLockElement === canvas) {
         document.exitPointerLock()
       }
     }
-  }, [gl])
+  }, [gl, toggleInteractableTarget])
 
   useEffect(() => {
     const canvas = gl.domElement
@@ -417,7 +991,229 @@ export const FirstPersonControls = () => {
     }
   }, [closeInteractableTarget, gl, toggleInteractableTarget])
 
-  useFrame((_, delta) => {
+  const syncElevatorColliderMeshes = useCallback(() => {
+    const nodes = useScene.getState().nodes
+    const interactive = useInteractive.getState()
+
+    for (const mesh of elevatorColliderMeshesRef.current) {
+      const { doorWidth, dynamic, elevatorId, kind, levelId, localPosition, side } = mesh.userData
+      const node = nodes[elevatorId]
+      const runtime = interactive.elevators[elevatorId]
+      const object = sceneRegistry.nodes.get(elevatorId)
+      if (!(node?.type === 'elevator' && object && node.visible !== false)) {
+        mesh.visible = false
+        continue
+      }
+
+      if (!dynamic && mesh.userData.matrixInitialized && mesh.visible) {
+        continue
+      }
+
+      let [localX, localY, localZ] = localPosition
+      const isCabCollider = kind.startsWith('cab-')
+      const isDoorCollider = kind === 'landing-door-left' || kind === 'landing-door-right'
+      const isCabDoorGate = kind === 'cab-door-gate'
+      const isLandingDoorGate = kind === 'landing-door-gate'
+
+      if (isCabCollider) {
+        localY += runtime?.carY ?? 0
+      }
+
+      if (kind === 'cab-door-left' || kind === 'cab-door-right') {
+        if (!runtime) {
+          mesh.visible = false
+          continue
+        }
+        localX = getElevatorDoorLeafX(
+          side ?? 'left',
+          doorWidth ?? node.doorWidth,
+          runtime.doorOpen,
+          node.doorStyle,
+        )
+        mesh.visible = true
+      } else if (isCabDoorGate) {
+        if (!runtime) {
+          mesh.visible = false
+          continue
+        }
+        mesh.visible = runtime.doorOpen < ELEVATOR_ENTRY_DOOR_OPEN_THRESHOLD
+      } else if (isDoorCollider) {
+        const doorOpen = runtime?.currentLevelId === levelId ? (runtime?.doorOpen ?? 0) : 0
+        localX = getElevatorDoorLeafX(
+          side ?? 'left',
+          doorWidth ?? node.doorWidth,
+          doorOpen,
+          node.doorStyle,
+        )
+        mesh.visible = true
+      } else if (isLandingDoorGate) {
+        const doorOpen = runtime?.currentLevelId === levelId ? (runtime?.doorOpen ?? 0) : 0
+        mesh.visible = doorOpen < ELEVATOR_ENTRY_DOOR_OPEN_THRESHOLD
+      } else {
+        mesh.visible = true
+      }
+
+      object.updateWorldMatrix(true, false)
+      elevatorColliderMatrix.copy(object.matrixWorld)
+      elevatorColliderMatrix.multiply(
+        elevatorColliderLocalMatrix.makeTranslation(localX, localY, localZ),
+      )
+      mesh.matrix.copy(elevatorColliderMatrix)
+      mesh.matrixWorld.copy(elevatorColliderMatrix)
+      mesh.userData.matrixInitialized = true
+    }
+  }, [])
+
+  useFrame(() => {
+    syncElevatorColliderMeshes()
+  }, -1)
+
+  const syncElevatorRide = useCallback(
+    (group: Group) => {
+      const nodes = useScene.getState().nodes
+      const interactive = useInteractive.getState()
+      const activeRide = ridingElevatorRef.current
+      let nextRide: {
+        cabHeight: number
+        cabCenterZ: number
+        carY: number
+        doorOpen: number
+        elevatorId: AnyNodeId
+        halfDepth: number
+        halfWidth: number
+        object: Object3D
+        phase: NonNullable<(typeof interactive.elevators)[AnyNodeId]>['phase']
+      } | null = null
+
+      const elevatorIds = activeRide
+        ? [
+            activeRide.elevatorId,
+            ...Array.from(sceneRegistry.byType.elevator).filter(
+              (elevatorId) => elevatorId !== activeRide.elevatorId,
+            ),
+          ]
+        : Array.from(sceneRegistry.byType.elevator)
+
+      for (const elevatorId of elevatorIds) {
+        const typedElevatorId = elevatorId as AnyNodeId
+        const node = nodes[typedElevatorId]
+        if (node?.type !== 'elevator') continue
+
+        const runtime = interactive.elevators[typedElevatorId]
+        const object = sceneRegistry.nodes.get(typedElevatorId)
+        if (!(runtime && object)) continue
+
+        object.updateWorldMatrix(true, true)
+        elevatorLocalEyePosition.copy(camera.position)
+        object.worldToLocal(elevatorLocalEyePosition)
+
+        const halfWidth = getElevatorCabWidth(node) / 2 - ELEVATOR_RIDE_HORIZONTAL_PADDING
+        const halfDepth = getElevatorCabDepth(node) / 2 - ELEVATOR_RIDE_HORIZONTAL_PADDING
+        const cabCenterZ = getElevatorCabCenterZ(node)
+        const cabHeight = Math.max(node.cabHeight, 1.4)
+        const insideFootprint =
+          Math.abs(elevatorLocalEyePosition.x) <= Math.max(halfWidth, 0.24) &&
+          Math.abs(elevatorLocalEyePosition.z - cabCenterZ) <= Math.max(halfDepth, 0.24)
+        const insideCabHeight =
+          elevatorLocalEyePosition.y >= runtime.carY + 0.35 &&
+          elevatorLocalEyePosition.y <= runtime.carY + cabHeight + 0.7
+        const continuingRide =
+          activeRide?.elevatorId === typedElevatorId &&
+          insideFootprint &&
+          elevatorLocalEyePosition.y >= runtime.carY - 0.2 &&
+          elevatorLocalEyePosition.y <= runtime.carY + cabHeight + 1.25
+
+        if ((insideFootprint && insideCabHeight) || continuingRide) {
+          nextRide = {
+            cabHeight,
+            cabCenterZ,
+            carY: runtime.carY,
+            doorOpen: runtime.doorOpen,
+            elevatorId: typedElevatorId,
+            halfDepth: Math.max(halfDepth, 0.24),
+            halfWidth: Math.max(halfWidth, 0.24),
+            object,
+            phase: runtime.phase,
+          }
+          break
+        }
+      }
+
+      if (!nextRide) {
+        ridingElevatorRef.current = null
+        setElevatorRideLocked(false)
+        return
+      }
+
+      const previousCarY =
+        activeRide?.elevatorId === nextRide.elevatorId ? activeRide.previousCarY : nextRide.carY
+      const deltaY = nextRide.carY - previousCarY
+      nextRide.object.updateWorldMatrix(true, true)
+      elevatorLocalControllerPosition.copy(group.position)
+      nextRide.object.worldToLocal(elevatorLocalControllerPosition)
+      const localControllerY =
+        activeRide?.elevatorId === nextRide.elevatorId && activeRide.localControllerY !== null
+          ? activeRide.localControllerY
+          : elevatorLocalControllerPosition.y - nextRide.carY
+
+      if (Math.abs(deltaY) > 0.0001) {
+        group.position.y += deltaY
+        controllerRef.current?.resetLinVel()
+      }
+
+      const shouldLockToCab =
+        nextRide.phase === 'closing' ||
+        nextRide.phase === 'moving' ||
+        (nextRide.phase === 'opening' && nextRide.doorOpen < ELEVATOR_ENTRY_DOOR_OPEN_THRESHOLD)
+      if (shouldLockToCab) {
+        elevatorLocalControllerPosition.copy(group.position)
+        nextRide.object.worldToLocal(elevatorLocalControllerPosition)
+        const desiredLocalY = nextRide.carY + localControllerY
+        if (Math.abs(elevatorLocalControllerPosition.y - desiredLocalY) > 0.002) {
+          elevatorLocalControllerPosition.y = desiredLocalY
+          elevatorWorldControllerPosition.copy(elevatorLocalControllerPosition)
+          nextRide.object.localToWorld(elevatorWorldControllerPosition)
+          group.position.y = elevatorWorldControllerPosition.y
+          controllerRef.current?.resetLinVel()
+          elevatorLocalControllerPosition.copy(group.position)
+          nextRide.object.worldToLocal(elevatorLocalControllerPosition)
+        }
+
+        const clampedX = Math.max(
+          -nextRide.halfWidth,
+          Math.min(nextRide.halfWidth, elevatorLocalControllerPosition.x),
+        )
+        const clampedZ = Math.max(
+          nextRide.cabCenterZ - nextRide.halfDepth,
+          Math.min(nextRide.cabCenterZ + nextRide.halfDepth, elevatorLocalControllerPosition.z),
+        )
+
+        if (
+          Math.abs(clampedX - elevatorLocalControllerPosition.x) > 0.0001 ||
+          Math.abs(clampedZ - elevatorLocalControllerPosition.z) > 0.0001
+        ) {
+          elevatorLocalControllerPosition.x = clampedX
+          elevatorLocalControllerPosition.z = clampedZ
+          elevatorWorldControllerPosition.copy(elevatorLocalControllerPosition)
+          nextRide.object.localToWorld(elevatorWorldControllerPosition)
+          group.position.x = elevatorWorldControllerPosition.x
+          group.position.z = elevatorWorldControllerPosition.z
+          controllerRef.current?.resetLinVel()
+        }
+      }
+
+      setElevatorRideLocked(shouldLockToCab)
+
+      ridingElevatorRef.current = {
+        elevatorId: nextRide.elevatorId,
+        localControllerY,
+        previousCarY: nextRide.carY,
+      }
+    },
+    [camera, setElevatorRideLocked],
+  )
+
+  useFrame(() => {
     if (!controllerRef.current?.group) return
 
     const group = controllerRef.current.group
@@ -426,17 +1222,20 @@ export const FirstPersonControls = () => {
     cameraEuler.set(pitchRef.current, yawRef.current, 0, 'YXZ')
     camera.quaternion.setFromEuler(cameraEuler)
     camera.updateMatrixWorld(true)
+    syncElevatorRide(group)
+    camera.position.copy(group.position).add(cameraOffset)
+    camera.updateMatrixWorld(true)
 
     const nextInteractableTarget = resolveInteractableTarget()
     const previousInteractableTarget = interactableTargetRef.current
     if (
-      previousInteractableTarget?.id !== nextInteractableTarget?.id ||
-      previousInteractableTarget?.type !== nextInteractableTarget?.type
+      getInteractableTargetKey(previousInteractableTarget) !==
+      getInteractableTargetKey(nextInteractableTarget)
     ) {
       interactableTargetRef.current = nextInteractableTarget
       useViewer.getState().setHoveredId(nextInteractableTarget?.id ?? null)
     }
-  })
+  }, 2.5)
 
   useEffect(() => {
     return () => {
@@ -446,6 +1245,11 @@ export const FirstPersonControls = () => {
     }
   }, [])
 
+  const firstPersonColliderMeshes = useMemo(
+    () => (world ? [world.mesh, ...elevatorColliderMeshes] : elevatorColliderMeshes),
+    [world, elevatorColliderMeshes],
+  )
+
   if (!world) {
     return null
   }
@@ -458,7 +1262,7 @@ export const FirstPersonControls = () => {
             acceleration={26}
             airDragFactor={0.3}
             colliderCapsuleArgs={[0.25, 0.8, 4, 8]}
-            colliderMeshes={[world.mesh]}
+            colliderMeshes={firstPersonColliderMeshes}
             collisionCheckIteration={3}
             collisionPushBackDamping={0.1}
             collisionPushBackThreshold={0.001}
@@ -478,6 +1282,7 @@ export const FirstPersonControls = () => {
             maxRunSpeed={5.5}
             maxSlope={1.2}
             maxWalkSpeed={4}
+            paused={isElevatorRideLocked}
             position={controllerStart.position}
             ref={controllerRef}
           />

packages/editor/src/components/editor/first-person/bvh-ecctrl.tsx

@@ -764,12 +764,12 @@ const BVHEcctrl = forwardRef<BVHEcctrlApi, EcctrlProps>(
 
       const deltaTime = Math.min(1 / 45, delta) * slowMotionFactor
       const keys = getKeys() ?? presetKeys
-      const forward = forwardState.current || keys.forward
-      const backward = backwardState.current || keys.backward
-      const leftward = leftwardState.current || keys.leftward
-      const rightward = rightwardState.current || keys.rightward
-      const run = runState.current || keys.run
-      const jump = jumpState.current || keys.jump
+      const forward = forwardState.current || (keys.forward ?? false)
+      const backward = backwardState.current || (keys.backward ?? false)
+      const leftward = leftwardState.current || (keys.leftward ?? false)
+      const rightward = rightwardState.current || (keys.rightward ?? false)
+      const run = runState.current || (keys.run ?? false)
+      const jump = jumpState.current || (keys.jump ?? false)
 
       setInputDirection({
         forward,

packages/editor/src/components/editor/floating-action-menu.tsx

@@ -6,6 +6,7 @@ import {
   type CeilingNode,
   ColumnNode,
   DoorNode,
+  ElevatorNode,
   FenceNode,
   generateId,
   ItemNode,
@@ -35,6 +36,7 @@ const ALLOWED_TYPES = [
   'item',
   'door',
   'window',
+  'elevator',
   'roof',
   'roof-segment',
   'stair',
@@ -183,6 +185,7 @@ export function FloatingActionMenu() {
         node.type === 'item' ||
         node.type === 'window' ||
         node.type === 'door' ||
+        node.type === 'elevator' ||
         node.type === 'wall' ||
         node.type === 'fence' ||
         node.type === 'column' ||
@@ -263,6 +266,8 @@ export function FloatingActionMenu() {
           duplicate = WindowNode.parse(duplicateInfo)
         } else if (node.type === 'item') {
           duplicate = ItemNode.parse(duplicateInfo)
+        } else if (node.type === 'elevator') {
+          duplicate = ElevatorNode.parse(duplicateInfo)
         } else if (node.type === 'column') {
           duplicate = ColumnNode.parse(duplicateInfo)
         } else if (node.type === 'wall') {
@@ -296,7 +301,11 @@ export function FloatingActionMenu() {
       }
 
       if (duplicate) {
-        if (duplicate.type === 'door' || duplicate.type === 'window') {
+        if (
+          duplicate.type === 'door' ||
+          duplicate.type === 'window' ||
+          duplicate.type === 'elevator'
+        ) {
           useScene.getState().createNode(duplicate, duplicate.parentId as AnyNodeId)
         } else if (duplicate.type === 'wall') {
           useScene.getState().createNode(duplicate, duplicate.parentId as AnyNodeId)
@@ -325,6 +334,7 @@ export function FloatingActionMenu() {
         }
         if (
           duplicate.type === 'item' ||
+          duplicate.type === 'elevator' ||
           duplicate.type === 'column' ||
           duplicate.type === 'wall' ||
           duplicate.type === 'fence' ||

packages/editor/src/components/editor/index.tsx

@@ -607,7 +607,7 @@ const ViewerSceneContent = memo(function ViewerSceneContent({
       <ThumbnailGenerator onThumbnailCapture={onThumbnailCapture} />
       <PresetThumbnailGenerator />
       {!isFirstPersonMode && <SiteEdgeLabels />}
-      {isFirstPersonMode && <InteractiveSystem />}
+      <InteractiveSystem />
     </>
   )
 })

packages/editor/src/components/editor/selection-manager.tsx

@@ -56,6 +56,8 @@ import useEditor, {
 import { boxSelectHandled } from '../tools/select/box-select-tool'
 
 const isNodeInCurrentLevel = (node: AnyNode): boolean => {
+  // Elevators are building-scoped, so they stay selectable across level filters.
+  if (node.type === 'elevator') return true
   const currentLevelId = useViewer.getState().selection.levelId
   if (!currentLevelId) return true // No level selected, allow all
   const nodeLevelId = resolveLevelId(node, useScene.getState().nodes)
@@ -68,6 +70,7 @@ type SelectableNodeType =
   | 'item'
   | 'column'
   | 'building'
+  | 'elevator'
   | 'zone'
   | 'slab'
   | 'ceiling'
@@ -565,6 +568,7 @@ const SELECTION_STRATEGIES: Record<string, SelectionStrategy> = {
       'fence',
       'item',
       'column',
+      'elevator',
       'zone',
       'slab',
       'ceiling',
@@ -579,11 +583,18 @@ const SELECTION_STRATEGIES: Record<string, SelectionStrategy> = {
     handleSelect: (node, nativeEvent, modifierKeys) => {
       const { selection, setSelection } = useViewer.getState()
       const nodes = useScene.getState().nodes
-      const nodeLevelId = resolveLevelId(node, nodes)
-      const buildingId = resolveBuildingId(nodeLevelId, nodes)
+      const nodeLevelId = node.type === 'elevator' ? null : resolveLevelId(node, nodes)
+      const buildingId =
+        node.type === 'elevator' &&
+        node.parentId &&
+        nodes[node.parentId as AnyNodeId]?.type === 'building'
+          ? node.parentId
+          : nodeLevelId
+            ? resolveBuildingId(nodeLevelId, nodes)
+            : null
 
       const updates: any = {}
-      if (nodeLevelId !== 'default' && nodeLevelId !== selection.levelId) {
+      if (nodeLevelId && nodeLevelId !== 'default' && nodeLevelId !== selection.levelId) {
         updates.levelId = nodeLevelId
       }
       if (buildingId && buildingId !== selection.buildingId) {
@@ -619,6 +630,7 @@ const SELECTION_STRATEGIES: Record<string, SelectionStrategy> = {
         node.type === 'wall' ||
         node.type === 'fence' ||
         node.type === 'column' ||
+        node.type === 'elevator' ||
         node.type === 'slab' ||
         node.type === 'ceiling' ||
         node.type === 'roof' ||
@@ -683,6 +695,7 @@ const getSelectionTarget = (node: AnyNode): SelectionTarget | null => {
     node.type === 'wall' ||
     node.type === 'fence' ||
     node.type === 'column' ||
+    node.type === 'elevator' ||
     node.type === 'slab' ||
     node.type === 'ceiling' ||
     node.type === 'roof' ||
@@ -1162,6 +1175,7 @@ export const SelectionManager = () => {
       'item',
       'column',
       'building',
+      'elevator',
       'zone',
       'slab',
       'ceiling',
@@ -1258,6 +1272,7 @@ export const SelectionManager = () => {
         node.type === 'wall' ||
         node.type === 'fence' ||
         node.type === 'column' ||
+        node.type === 'elevator' ||
         node.type === 'slab' ||
         node.type === 'ceiling' ||
         node.type === 'roof' ||
@@ -1312,6 +1327,7 @@ export const SelectionManager = () => {
       'item',
       'column',
       'building',
+      'elevator',
       'slab',
       'ceiling',
       'roof',
@@ -1385,6 +1401,7 @@ export const SelectionManager = () => {
       'fence',
       'item',
       'column',
+      'elevator',
       'slab',
       'ceiling',
       'roof',

packages/editor/src/components/editor/use-floorplan-hit-testing.ts

@@ -5,6 +5,7 @@ import type {
   CeilingNode,
   ColumnNode,
   DoorNode,
+  ElevatorNode,
   ItemNode,
   Point2D,
   RoofNode,
@@ -52,6 +53,11 @@ type ColumnPolygonEntry = {
   polygon: Point2D[]
 }
 
+type ElevatorPolygonEntry = {
+  elevator: ElevatorNode
+  polygon: Point2D[]
+}
+
 type FloorplanRoofEntry = {
   roof: RoofNode
   segments: Array<{
@@ -81,6 +87,7 @@ type UseFloorplanHitTestingArgs = {
   columnPolygons: ColumnPolygonEntry[]
   displaySlabPolygons: SlabPolygonEntry[]
   displayWallPolygons: WallPolygonEntry[]
+  floorplanElevatorEntries: ElevatorPolygonEntry[]
   floorplanItemEntries: FloorplanItemEntry[]
   floorplanOpeningHitTolerance: number
   floorplanRoofEntries: FloorplanRoofEntry[]
@@ -98,6 +105,7 @@ export function useFloorplanHitTesting({
   columnPolygons,
   displaySlabPolygons,
   displayWallPolygons,
+  floorplanElevatorEntries,
   floorplanItemEntries,
   floorplanOpeningHitTolerance,
   floorplanRoofEntries,
@@ -121,6 +129,7 @@ export function useFloorplanHitTesting({
         openings: openingsPolygons,
         roofs: floorplanRoofEntries,
         stairs: floorplanStairEntries,
+        elevators: floorplanElevatorEntries,
         walls: displayWallPolygons,
         slabs: displaySlabPolygons,
         openingHitTolerance: floorplanOpeningHitTolerance,
@@ -135,6 +144,7 @@ export function useFloorplanHitTesting({
       displaySlabPolygons,
       displayWallPolygons,
       floorplanItemEntries,
+      floorplanElevatorEntries,
       floorplanOpeningHitTolerance,
       floorplanRoofEntries,
       floorplanStairEntries,
@@ -160,6 +170,7 @@ export function useFloorplanHitTesting({
         roofs: floorplanRoofEntries,
         slabs: displaySlabPolygons,
         columns: columnPolygons,
+        elevators: floorplanElevatorEntries,
         stairs: floorplanStairEntries,
       }),
     [
@@ -168,6 +179,7 @@ export function useFloorplanHitTesting({
       displaySlabPolygons,
       displayWallPolygons,
       floorplanItemEntries,
+      floorplanElevatorEntries,
       floorplanRoofEntries,
       floorplanStairEntries,
       isFloorplanItemContextActive,

packages/editor/src/components/tools/elevator/elevator-defaults.ts

@@ -0,0 +1,8 @@
+export const DEFAULT_ELEVATOR_WIDTH = 1.6
+export const DEFAULT_ELEVATOR_DEPTH = 1.6
+export const DEFAULT_ELEVATOR_CAB_HEIGHT = 2.35
+export const DEFAULT_ELEVATOR_DOOR_WIDTH = 0.95
+export const DEFAULT_ELEVATOR_DOOR_HEIGHT = 2.1
+export const DEFAULT_ELEVATOR_SPEED = 2.2
+export const DEFAULT_ELEVATOR_DOOR_DURATION_MS = 900
+export const DEFAULT_ELEVATOR_DWELL_MS = 1400

packages/editor/src/components/tools/elevator/elevator-tool.tsx

@@ -0,0 +1,214 @@
+import {
+  type AnyNodeId,
+  type BuildingNode,
+  ElevatorNode,
+  emitter,
+  type GridEvent,
+  type LevelNode,
+  useScene,
+} from '@pascal-app/core'
+import { useEffect, useMemo, useRef } from 'react'
+import * as THREE from 'three'
+import { resolveCurrentBuildingId, resolveElevatorSupportY } from '../../../lib/elevator-support'
+import { sfxEmitter } from '../../../lib/sfx-bus'
+import { CursorSphere } from '../shared/cursor-sphere'
+import {
+  DEFAULT_ELEVATOR_CAB_HEIGHT,
+  DEFAULT_ELEVATOR_DEPTH,
+  DEFAULT_ELEVATOR_DOOR_DURATION_MS,
+  DEFAULT_ELEVATOR_DOOR_HEIGHT,
+  DEFAULT_ELEVATOR_DOOR_WIDTH,
+  DEFAULT_ELEVATOR_DWELL_MS,
+  DEFAULT_ELEVATOR_SPEED,
+  DEFAULT_ELEVATOR_WIDTH,
+} from './elevator-defaults'
+
+const GRID_OFFSET = 0.02
+
+type ElevatorToolProps = {
+  buildingId: BuildingNode['id'] | null
+  levelId: LevelNode['id'] | null
+  onPlaced?: (elevatorId: AnyNodeId, buildingId: BuildingNode['id']) => void
+}
+
+function resolveDefaultServiceRange(
+  buildingId: BuildingNode['id'],
+  selectedLevelId: LevelNode['id'] | null,
+): {
+  defaultLevelId: LevelNode['id'] | null
+  fromLevelId: LevelNode['id'] | null
+  toLevelId: LevelNode['id'] | null
+} {
+  const nodes = useScene.getState().nodes
+  const building = nodes[buildingId as AnyNodeId]
+  if (building?.type !== 'building') {
+    return { defaultLevelId: null, fromLevelId: null, toLevelId: null }
+  }
+
+  const levels = building.children
+    .map((childId) => nodes[childId as AnyNodeId])
+    .filter((node): node is LevelNode => node?.type === 'level')
+    .sort((left, right) => left.level - right.level)
+  const selectedLevelIndex = levels.findIndex((level) => level.id === selectedLevelId)
+  const fromIndex = selectedLevelIndex >= 0 ? selectedLevelIndex : 0
+  const fromLevel = levels[fromIndex]
+  const toLevel = levels[Math.min(fromIndex + 1, levels.length - 1)] ?? fromLevel
+
+  return {
+    defaultLevelId: fromLevel?.id ?? null,
+    fromLevelId: fromLevel?.id ?? null,
+    toLevelId: toLevel?.id ?? fromLevel?.id ?? null,
+  }
+}
+
+function createElevatorPreviewGeometry(): THREE.BufferGeometry {
+  return new THREE.BoxGeometry(
+    DEFAULT_ELEVATOR_WIDTH,
+    DEFAULT_ELEVATOR_CAB_HEIGHT,
+    DEFAULT_ELEVATOR_DEPTH,
+  )
+}
+
+function commitElevatorPlacement(
+  buildingId: BuildingNode['id'],
+  selectedLevelId: LevelNode['id'] | null,
+  x: number,
+  z: number,
+  rotation: number,
+  onPlaced: ElevatorToolProps['onPlaced'],
+): void {
+  const { createNode, nodes } = useScene.getState()
+  const elevatorCount = Object.values(nodes).filter((node) => node.type === 'elevator').length
+  const serviceRange = resolveDefaultServiceRange(buildingId, selectedLevelId)
+  const supportY = resolveElevatorSupportY({
+    buildingId,
+    preferredLevelId: serviceRange.fromLevelId ?? serviceRange.defaultLevelId,
+    x,
+    z,
+  })
+  const elevator = ElevatorNode.parse({
+    name: `Elevator ${elevatorCount + 1}`,
+    parentId: buildingId,
+    position: [x, supportY, z],
+    rotation,
+    width: DEFAULT_ELEVATOR_WIDTH,
+    depth: DEFAULT_ELEVATOR_DEPTH,
+    cabHeight: DEFAULT_ELEVATOR_CAB_HEIGHT,
+    doorWidth: DEFAULT_ELEVATOR_DOOR_WIDTH,
+    doorHeight: DEFAULT_ELEVATOR_DOOR_HEIGHT,
+    ...serviceRange,
+    speed: DEFAULT_ELEVATOR_SPEED,
+    doorDurationMs: DEFAULT_ELEVATOR_DOOR_DURATION_MS,
+    dwellMs: DEFAULT_ELEVATOR_DWELL_MS,
+  })
+
+  createNode(elevator, buildingId)
+  onPlaced?.(elevator.id as AnyNodeId, buildingId)
+  sfxEmitter.emit('sfx:structure-build')
+}
+
+export const ElevatorTool: React.FC<ElevatorToolProps> = ({ buildingId, levelId, onPlaced }) => {
+  const cursorRef = useRef<THREE.Group>(null)
+  const previewRef = useRef<THREE.Group>(null)
+  const rotationRef = useRef(0)
+  const previousGridPosRef = useRef<[number, number] | null>(null)
+  const previewGeometry = useMemo(() => createElevatorPreviewGeometry(), [])
+
+  useEffect(() => {
+    const currentBuildingId = resolveCurrentBuildingId({
+      buildingId,
+      levelId,
+      nodes: useScene.getState().nodes,
+    })
+    if (!currentBuildingId) return
+
+    rotationRef.current = 0
+    if (previewRef.current) previewRef.current.rotation.y = 0
+
+    const onGridMove = (event: GridEvent) => {
+      const gridX = Math.round(event.localPosition[0] * 2) / 2
+      const gridZ = Math.round(event.localPosition[2] * 2) / 2
+      const supportY = resolveElevatorSupportY({
+        buildingId: currentBuildingId,
+        preferredLevelId: levelId as LevelNode['id'] | null,
+        x: gridX,
+        z: gridZ,
+      })
+
+      cursorRef.current?.position.set(gridX, supportY + GRID_OFFSET, gridZ)
+      previewRef.current?.position.set(gridX, supportY + DEFAULT_ELEVATOR_CAB_HEIGHT / 2, gridZ)
+
+      if (
+        previousGridPosRef.current &&
+        (gridX !== previousGridPosRef.current[0] || gridZ !== previousGridPosRef.current[1])
+      ) {
+        sfxEmitter.emit('sfx:grid-snap')
+      }
+
+      previousGridPosRef.current = [gridX, gridZ]
+    }
+
+    const onGridClick = (event: GridEvent) => {
+      const latestBuildingId = resolveCurrentBuildingId({
+        buildingId,
+        levelId,
+        nodes: useScene.getState().nodes,
+      })
+      if (!latestBuildingId) return
+
+      const gridX = Math.round(event.localPosition[0] * 2) / 2
+      const gridZ = Math.round(event.localPosition[2] * 2) / 2
+      commitElevatorPlacement(
+        latestBuildingId,
+        levelId,
+        gridX,
+        gridZ,
+        rotationRef.current,
+        onPlaced,
+      )
+    }
+
+    const onKeyDown = (event: KeyboardEvent) => {
+      if (event.target instanceof HTMLInputElement || event.target instanceof HTMLTextAreaElement) {
+        return
+      }
+
+      const ROTATION_STEP = Math.PI / 4
+      let rotationDelta = 0
+      if (event.key === 'r' || event.key === 'R') rotationDelta = ROTATION_STEP
+      else if (event.key === 't' || event.key === 'T') rotationDelta = -ROTATION_STEP
+
+      if (rotationDelta !== 0) {
+        event.preventDefault()
+        sfxEmitter.emit('sfx:item-rotate')
+        rotationRef.current += rotationDelta
+        if (previewRef.current) previewRef.current.rotation.y = rotationRef.current
+      }
+    }
+
+    emitter.on('grid:move', onGridMove)
+    emitter.on('grid:click', onGridClick)
+    window.addEventListener('keydown', onKeyDown)
+
+    return () => {
+      emitter.off('grid:move', onGridMove)
+      emitter.off('grid:click', onGridClick)
+      window.removeEventListener('keydown', onKeyDown)
+    }
+  }, [buildingId, levelId, onPlaced])
+
+  return (
+    <group>
+      <CursorSphere ref={cursorRef} />
+      <group ref={previewRef}>
+        <mesh castShadow geometry={previewGeometry}>
+          <meshStandardMaterial color="#38bdf8" depthWrite={false} opacity={0.32} transparent />
+        </mesh>
+        <mesh position={[0, DEFAULT_ELEVATOR_CAB_HEIGHT / 2, -DEFAULT_ELEVATOR_DEPTH / 2 - 0.03]}>
+          <boxGeometry args={[DEFAULT_ELEVATOR_DOOR_WIDTH, DEFAULT_ELEVATOR_DOOR_HEIGHT, 0.035]} />
+          <meshStandardMaterial color="#e5e7eb" depthWrite={false} opacity={0.45} transparent />
+        </mesh>
+      </group>
+    </group>
+  )
+}

packages/editor/src/components/tools/elevator/move-elevator-tool.tsx

@@ -0,0 +1,253 @@
+import {
+  type AnyNodeId,
+  type BuildingNode,
+  type ElevatorNode,
+  ElevatorNode as ElevatorNodeSchema,
+  emitter,
+  type GridEvent,
+  type LevelNode,
+  pauseSceneHistory,
+  resumeSceneHistory,
+  sceneRegistry,
+  useLiveTransforms,
+  useScene,
+} from '@pascal-app/core'
+import { useCallback, useEffect, useRef, useState } from 'react'
+import { markToolCancelConsumed } from '../../../hooks/use-keyboard'
+import { resolveElevatorSupportY } from '../../../lib/elevator-support'
+import { sfxEmitter } from '../../../lib/sfx-bus'
+import useEditor from '../../../store/use-editor'
+import { CursorSphere } from '../shared/cursor-sphere'
+
+function stripMoveMetadata(metadata: ElevatorNode['metadata']) {
+  if (typeof metadata !== 'object' || metadata === null || Array.isArray(metadata)) {
+    return metadata
+  }
+
+  const nextMeta = { ...(metadata as Record<string, unknown>) }
+  delete nextMeta.isNew
+  delete nextMeta.isTransient
+  return nextMeta as ElevatorNode['metadata']
+}
+
+export function MoveElevatorTool({
+  node: movingNode,
+  onCommitted,
+}: {
+  node: ElevatorNode
+  onCommitted?: (nodeId: AnyNodeId) => void
+}) {
+  const onCommittedRef = useRef(onCommitted)
+  const historyPausedRef = useRef(false)
+  const previousGridPosRef = useRef<[number, number] | null>(null)
+  const previewPositionRef = useRef<ElevatorNode['position']>([
+    movingNode.position[0],
+    movingNode.position[1],
+    movingNode.position[2],
+  ])
+  const [cursorPosition, setCursorPosition] = useState<[number, number, number]>(() => [
+    movingNode.position[0],
+    movingNode.position[1],
+    movingNode.position[2],
+  ])
+
+  const exitMoveMode = useCallback(() => {
+    useEditor.getState().setMovingNode(null)
+  }, [])
+
+  useEffect(() => {
+    onCommittedRef.current = onCommitted
+  }, [onCommitted])
+
+  useEffect(() => {
+    const pauseHistory = () => {
+      const temporal = useScene.temporal.getState()
+      if (historyPausedRef.current || !temporal.isTracking) return
+      pauseSceneHistory(useScene)
+      historyPausedRef.current = true
+    }
+    const resumeHistory = () => {
+      if (!historyPausedRef.current) return
+      resumeSceneHistory(useScene)
+      historyPausedRef.current = false
+    }
+
+    pauseHistory()
+    const movingNodeId = (movingNode as { id?: ElevatorNode['id'] }).id
+
+    const meta =
+      typeof movingNode.metadata === 'object' && movingNode.metadata !== null
+        ? (movingNode.metadata as Record<string, unknown>)
+        : {}
+    const isNew = !!meta.isNew
+    const committedMeta = stripMoveMetadata(movingNode.metadata)
+    const original = {
+      position: [...movingNode.position] as ElevatorNode['position'],
+      rotation: movingNode.rotation,
+      metadata: movingNode.metadata,
+    }
+
+    let wasCommitted = false
+    let wasCancelled = false
+    let pendingRotation = movingNode.rotation
+    const supportBuildingId = movingNode.parentId as BuildingNode['id'] | null | undefined
+    const supportLevelId = (movingNode.fromLevelId ?? movingNode.defaultLevelId) as
+      | LevelNode['id']
+      | null
+
+    const applyPreview = (
+      position: ElevatorNode['position'],
+      rotation: ElevatorNode['rotation'],
+    ) => {
+      if (movingNodeId) {
+        useLiveTransforms.getState().set(movingNodeId, { position, rotation })
+      }
+
+      const object = movingNodeId ? sceneRegistry.nodes.get(movingNodeId) : null
+      if (object) {
+        object.position.set(position[0], position[1], position[2])
+        object.rotation.y = rotation
+      }
+    }
+
+    const resetObject = (
+      position: ElevatorNode['position'],
+      rotation: ElevatorNode['rotation'],
+    ) => {
+      const object = movingNodeId ? sceneRegistry.nodes.get(movingNodeId) : null
+      if (object) {
+        object.position.set(position[0], position[1], position[2])
+        object.rotation.y = rotation
+      }
+    }
+
+    const clearPreview = () => {
+      if (movingNodeId) {
+        useLiveTransforms.getState().clear(movingNodeId)
+      }
+    }
+
+    const onGridMove = (event: GridEvent) => {
+      const gridX = Math.round(event.localPosition[0] * 2) / 2
+      const gridZ = Math.round(event.localPosition[2] * 2) / 2
+      const supportY = resolveElevatorSupportY({
+        buildingId: supportBuildingId,
+        preferredLevelId: supportLevelId,
+        x: gridX,
+        z: gridZ,
+      })
+
+      if (
+        previousGridPosRef.current &&
+        (gridX !== previousGridPosRef.current[0] || gridZ !== previousGridPosRef.current[1])
+      ) {
+        sfxEmitter.emit('sfx:grid-snap')
+      }
+
+      previousGridPosRef.current = [gridX, gridZ]
+      setCursorPosition([gridX, supportY, gridZ])
+      previewPositionRef.current = [gridX, supportY, gridZ]
+      applyPreview(previewPositionRef.current, pendingRotation)
+    }
+
+    const onGridClick = (event: GridEvent) => {
+      const gridX = Math.round(event.localPosition[0] * 2) / 2
+      const gridZ = Math.round(event.localPosition[2] * 2) / 2
+      const supportY = resolveElevatorSupportY({
+        buildingId: supportBuildingId,
+        preferredLevelId: supportLevelId,
+        x: gridX,
+        z: gridZ,
+      })
+      const nextPosition: ElevatorNode['position'] = [gridX, supportY, gridZ]
+
+      wasCommitted = true
+      clearPreview()
+      resumeHistory()
+      if (movingNodeId && useScene.getState().nodes[movingNodeId as AnyNodeId]) {
+        useScene.getState().updateNode(movingNodeId as AnyNodeId, {
+          position: nextPosition,
+          rotation: pendingRotation,
+          metadata: committedMeta,
+        })
+        onCommittedRef.current?.(movingNodeId as AnyNodeId)
+      } else if (movingNode.parentId) {
+        const elevator = ElevatorNodeSchema.parse({
+          ...movingNode,
+          id: undefined,
+          position: nextPosition,
+          rotation: pendingRotation,
+          metadata: committedMeta,
+        })
+        useScene.getState().createNode(elevator, movingNode.parentId as AnyNodeId)
+        onCommittedRef.current?.(elevator.id as AnyNodeId)
+      }
+
+      sfxEmitter.emit('sfx:item-place')
+      exitMoveMode()
+      event.nativeEvent?.stopPropagation?.()
+    }
+
+    const onCancel = () => {
+      wasCancelled = true
+      clearPreview()
+      if (isNew && movingNodeId) {
+        useScene.getState().deleteNode(movingNodeId as AnyNodeId)
+      } else {
+        if (movingNodeId) {
+          useScene.getState().updateNode(movingNodeId as AnyNodeId, {
+            position: original.position,
+            rotation: original.rotation,
+            metadata: original.metadata,
+          })
+        }
+      }
+      resetObject(original.position, original.rotation)
+      resumeHistory()
+      markToolCancelConsumed()
+      exitMoveMode()
+    }
+
+    const onKeyDown = (event: KeyboardEvent) => {
+      if (event.target instanceof HTMLInputElement || event.target instanceof HTMLTextAreaElement) {
+        return
+      }
+
+      const ROTATION_STEP = Math.PI / 4
+      let rotationDelta = 0
+      if (event.key === 'r' || event.key === 'R') rotationDelta = ROTATION_STEP
+      else if (event.key === 't' || event.key === 'T') rotationDelta = -ROTATION_STEP
+
+      if (rotationDelta !== 0) {
+        event.preventDefault()
+        sfxEmitter.emit('sfx:item-rotate')
+        pendingRotation += rotationDelta
+        applyPreview(previewPositionRef.current, pendingRotation)
+      }
+    }
+
+    emitter.on('grid:move', onGridMove)
+    emitter.on('grid:click', onGridClick)
+    emitter.on('tool:cancel', onCancel)
+    window.addEventListener('keydown', onKeyDown)
+
+    return () => {
+      clearPreview()
+      if (!(wasCommitted || wasCancelled || isNew) && movingNodeId) {
+        useScene.getState().updateNode(movingNodeId as AnyNodeId, {
+          position: original.position,
+          rotation: original.rotation,
+          metadata: original.metadata,
+        })
+        resetObject(original.position, original.rotation)
+      }
+      resumeHistory()
+      emitter.off('grid:move', onGridMove)
+      emitter.off('grid:click', onGridClick)
+      emitter.off('tool:cancel', onCancel)
+      window.removeEventListener('keydown', onKeyDown)
+    }
+  }, [movingNode, exitMoveMode])
+
+  return <CursorSphere position={cursorPosition} showTooltip={false} />
+}

packages/editor/src/components/tools/item/item-tool.tsx

@@ -1,10 +1,10 @@
+import type { AssetInput } from '@pascal-app/core'
 import { sfxEmitter } from '../../../lib/sfx-bus'
 import useEditor from '../../../store/use-editor'
 import { useDraftNode } from './use-draft-node'
 import { usePlacementCoordinator } from './use-placement-coordinator'
 
-export const ItemTool: React.FC = () => {
-  const selectedItem = useEditor((state) => state.selectedItem)
+function ItemPlacementContent({ selectedItem }: { selectedItem: AssetInput }) {
   const draftNode = useDraftNode()
 
   const cursor = usePlacementCoordinator({
@@ -21,6 +21,12 @@ export const ItemTool: React.FC = () => {
     },
   })
 
-  if (!selectedItem) return null
   return <>{cursor}</>
 }
+
+export const ItemTool: React.FC = () => {
+  const selectedItem = useEditor((state) => state.selectedItem)
+
+  if (!selectedItem) return null
+  return <ItemPlacementContent selectedItem={selectedItem} />
+}

packages/editor/src/components/tools/item/move-tool.tsx

@@ -1,8 +1,10 @@
 import type {
+  AnyNodeId,
   BuildingNode,
   CeilingNode,
   ColumnNode,
   DoorNode,
+  ElevatorNode,
   FenceNode,
   ItemNode,
   RoofNode,
@@ -21,6 +23,7 @@ import { MoveBuildingContent } from '../building/move-building-tool'
 import { MoveCeilingTool } from '../ceiling/move-ceiling-tool'
 import { MoveColumnTool } from '../column/move-column-tool'
 import { MoveDoorTool } from '../door/move-door-tool'
+import { MoveElevatorTool } from '../elevator/move-elevator-tool'
 import { MoveFenceTool } from '../fence/move-fence-tool'
 import { MoveRoofTool } from '../roof/move-roof-tool'
 import { MoveSlabTool } from '../slab/move-slab-tool'
@@ -90,13 +93,18 @@ function MoveItemContent({ movingNode }: { movingNode: ItemNode }) {
   return <>{cursor}</>
 }
 
-export const MoveTool: React.FC = () => {
+export const MoveTool: React.FC<{
+  onNodeMoved?: (nodeId: AnyNodeId) => void
+  onSpawnMoved?: (nodeId: SpawnNode['id']) => void
+}> = ({ onNodeMoved, onSpawnMoved }) => {
   const movingNode = useEditor((state) => state.movingNode)
 
   if (!movingNode) return null
   if (movingNode.type === 'building')
     return <MoveBuildingContent node={movingNode as BuildingNode} />
   if (movingNode.type === 'door') return <MoveDoorTool node={movingNode as DoorNode} />
+  if (movingNode.type === 'elevator')
+    return <MoveElevatorTool node={movingNode as ElevatorNode} onCommitted={onNodeMoved} />
   if (movingNode.type === 'window') return <MoveWindowTool node={movingNode as WindowNode} />
   if (movingNode.type === 'ceiling') return <MoveCeilingTool node={movingNode as CeilingNode} />
   if (movingNode.type === 'column') return <MoveColumnTool node={movingNode as ColumnNode} />
@@ -105,7 +113,8 @@ export const MoveTool: React.FC = () => {
   if (movingNode.type === 'fence') return <MoveFenceTool node={movingNode as FenceNode} />
   if (movingNode.type === 'roof' || movingNode.type === 'roof-segment')
     return <MoveRoofTool node={movingNode as RoofNode | RoofSegmentNode} />
-  if (movingNode.type === 'spawn') return <MoveSpawnTool node={movingNode as SpawnNode} />
+  if (movingNode.type === 'spawn')
+    return <MoveSpawnTool node={movingNode as SpawnNode} onCommitted={onSpawnMoved} />
   if (movingNode.type === 'stair' || movingNode.type === 'stair-segment')
     return <MoveRoofTool node={movingNode as StairNode | StairSegmentNode} />
   return <MoveItemContent movingNode={movingNode as ItemNode} />

packages/editor/src/components/tools/item/use-placement-coordinator.tsx

@@ -116,10 +116,10 @@ function expandBoundsToGrid(
 
 function getFallbackPreviewBounds(
   item: import('@pascal-app/core').ItemNode | null,
-  asset: AssetInput,
-  attachTo: AssetInput['attachTo'],
+  asset: AssetInput | null | undefined,
+  attachTo: AssetInput['attachTo'] | null | undefined,
 ): PreviewBounds {
-  const dims = item ? getScaledDimensions(item) : (asset.dimensions ?? DEFAULT_DIMENSIONS)
+  const dims = item ? getScaledDimensions(item) : (asset?.dimensions ?? DEFAULT_DIMENSIONS)
   return {
     min: [-dims[0] / 2, 0, attachTo === 'wall-side' ? -dims[2] : -dims[2] / 2],
     max: [dims[0] / 2, dims[1], attachTo === 'wall-side' ? 0 : dims[2] / 2],
@@ -1341,7 +1341,7 @@ export function usePlacementCoordinator(config: PlacementCoordinatorConfig): Rea
   const dims = getGridAlignedDimensions(rawDims, initialAttachTo, gridSnapStep)
   const wallSideZOffset = initialAttachTo === 'wall-side' ? -dims[2] / 2 : 0
   const initialDimensionBounds = expandBoundsToGrid(
-    getFallbackPreviewBounds(initialDraft, config.asset!, initialAttachTo),
+    getFallbackPreviewBounds(initialDraft, config.asset, initialAttachTo),
     initialAttachTo,
     gridSnapStep,
   )

packages/editor/src/components/tools/tool-manager.tsx

@@ -12,6 +12,7 @@ import { CeilingHoleEditor } from './ceiling/ceiling-hole-editor'
 import { CeilingTool } from './ceiling/ceiling-tool'
 import { ColumnTool } from './column/column-tool'
 import { DoorTool } from './door/door-tool'
+import { ElevatorTool } from './elevator/elevator-tool'
 import { CurveFenceTool } from './fence/curve-fence-tool'
 import { FenceTool } from './fence/fence-tool'
 import { MoveFenceEndpointTool } from './fence/move-fence-endpoint-tool'
@@ -45,7 +46,6 @@ const tools: Record<Phase, Partial<Record<Tool, React.FC>>> = {
     door: DoorTool,
     item: ItemTool,
     zone: ZoneTool,
-    spawn: SpawnTool,
     window: WindowTool,
   },
   furnish: {
@@ -67,6 +67,7 @@ export const ToolManager: React.FC = () => {
   const selectedIds = useViewer((state) => state.selection.selectedIds)
   const buildingId = useViewer((state) => state.selection.buildingId)
   const activeLevelId = useViewer((state) => state.selection.levelId)
+  const setSelection = useViewer((state) => state.setSelection)
   const nodes = useScene((state) => state.nodes)
 
   // Building transform for the local group — all building-relative tools live inside this group
@@ -128,14 +129,22 @@ export const ToolManager: React.FC = () => {
 
   const BuildToolComponent = showBuildTool ? tools[phase]?.[tool] : null
   const handlePlacedNodeSelected = (nodeId: AnyNodeId) => {
-    useViewer.getState().setSelection({ selectedIds: [nodeId] })
+    setSelection({ selectedIds: [nodeId] })
+  }
+  const handlePlacedElevatorSelected = (
+    nodeId: AnyNodeId,
+    elevatorBuildingId: BuildingNode['id'],
+  ) => {
+    setSelection({ buildingId: elevatorBuildingId, selectedIds: [nodeId] })
   }
 
   return (
     <>
       {/* World-space tools: site boundary and building movement operate in world coordinates */}
       {showSiteBoundaryEditor && <SiteBoundaryEditor />}
-      {movingNode?.type === 'building' && <MoveTool onSpawnMoved={handlePlacedNodeSelected} />}
+      {movingNode?.type === 'building' && (
+        <MoveTool onNodeMoved={handlePlacedNodeSelected} onSpawnMoved={handlePlacedNodeSelected} />
+      )}
 
       {/* Building-local group: all other tools are relative to the selected building.
           Cursor visuals set positions in building-local space; this group applies the
@@ -160,13 +169,29 @@ export const ToolManager: React.FC = () => {
         {curvingWall && <CurveWallTool node={curvingWall} />}
         {curvingFence && <CurveFenceTool node={curvingFence} />}
         {movingNode && movingNode.type !== 'building' && (
-          <MoveTool onSpawnMoved={handlePlacedNodeSelected} />
+          <MoveTool
+            onNodeMoved={handlePlacedNodeSelected}
+            onSpawnMoved={handlePlacedNodeSelected}
+          />
         )}
-        {!movingNode && BuildToolComponent && tool === 'spawn' ? (
+        {!movingNode && showBuildTool && tool === 'spawn' && (
           <SpawnTool currentLevelId={activeLevelId ?? null} onPlaced={handlePlacedNodeSelected} />
-        ) : !movingNode && showBuildTool && tool === 'column' ? (
+        )}
+        {!movingNode && showBuildTool && tool === 'column' && (
           <ColumnTool currentLevelId={activeLevelId ?? null} onPlaced={handlePlacedNodeSelected} />
-        ) : !movingNode && BuildToolComponent && tool !== 'column' ? (
+        )}
+        {!movingNode && showBuildTool && tool === 'elevator' && (
+          <ElevatorTool
+            buildingId={buildingId as BuildingNode['id'] | null}
+            levelId={activeLevelId ?? null}
+            onPlaced={handlePlacedElevatorSelected}
+          />
+        )}
+        {!movingNode &&
+        BuildToolComponent &&
+        tool !== 'spawn' &&
+        tool !== 'column' &&
+        tool !== 'elevator' ? (
           <BuildToolComponent />
         ) : null}
       </group>

packages/editor/src/components/ui/action-menu/structure-tools.tsx

@@ -25,6 +25,7 @@ export const tools: ToolConfig[] = [
   { id: 'slab', iconSrc: '/icons/floor.png', label: 'Slab' },
   { id: 'ceiling', iconSrc: '/icons/ceiling.png', label: 'Ceiling' },
   { id: 'column', iconSrc: '/icons/column.png', label: 'Column' },
+  { id: 'elevator', iconSrc: '/icons/elevator.svg', label: 'Elevator' },
   { id: 'roof', iconSrc: '/icons/roof.png', label: 'Gable Roof' },
   { id: 'stair', iconSrc: '/icons/stairs.png', label: 'Stairs' },
   { id: 'door', iconSrc: '/icons/door.png', label: 'Door' },

packages/editor/src/components/ui/command-palette/editor-commands.tsx

@@ -190,8 +190,11 @@ export function EditorCommands() {
             const { nodes } = useScene.getState()
             const building = Object.values(nodes).find((n) => n.type === 'building')
             if (!building) return
+            const levelCount = building.children.filter(
+              (childId) => nodes[childId as keyof typeof nodes]?.type === 'level',
+            ).length
             const newLevel = LevelNode.parse({
-              level: building.children.length,
+              level: levelCount,
               children: [],
               parentId: building.id,
             })

packages/editor/src/components/ui/controls/material-picker.tsx

@@ -4,7 +4,6 @@ import {
   getCatalogMaterialById,
   getLibraryMaterialIdFromRef,
   getMaterialsForCategory,
-  getMaterialsForTarget,
   MATERIAL_CATEGORIES,
   type MaterialSchema,
   type MaterialTarget,

packages/editor/src/components/ui/controls/metric-control.tsx

@@ -9,24 +9,28 @@ interface MetricControlProps {
   label: React.ReactNode
   value: number
   onChange: (value: number) => void
+  onCommit?: (value: number) => void
   min?: number
   max?: number
   precision?: number
   step?: number
   className?: string
   unit?: string
+  restoreOnCommit?: boolean
 }
 
 export function MetricControl({
   label,
   value,
   onChange,
+  onCommit,
   min = Number.NEGATIVE_INFINITY,
   max = Number.POSITIVE_INFINITY,
   precision = 2,
   step = 1,
   className,
   unit = '',
+  restoreOnCommit = true,
 }: MetricControlProps) {
   const viewerUnit = useViewer((state) => state.unit)
   const isImperial = viewerUnit === 'imperial' && unit === 'm'
@@ -53,6 +57,17 @@ export function MetricControl({
     [min, max],
   )
 
+  const applyCommittedValue = useCallback(
+    (nextValue: number) => {
+      if (onCommit) {
+        onCommit(nextValue)
+      } else {
+        onChange(nextValue)
+      }
+    },
+    [onChange, onCommit],
+  )
+
   useEffect(() => {
     if (!isEditing) {
       setInputValue(displayValue.toFixed(precision))
@@ -77,13 +92,13 @@ export function MetricControl({
       const finalValue = Number.parseFloat((newValue * multiplier).toFixed(precision)) / multiplier
 
       if (Math.abs(finalValue - valueRef.current) > 1e-6) {
-        onChange(finalValue)
+        applyCommittedValue(finalValue)
       }
     }
 
     container.addEventListener('wheel', handleWheel, { passive: false })
     return () => container.removeEventListener('wheel', handleWheel)
-  }, [isEditing, step, clamp, onChange, precision, multiplier])
+  }, [isEditing, step, clamp, applyCommittedValue, precision, multiplier])
 
   useEffect(() => {
     if (!isHovered || isEditing) return
@@ -104,14 +119,14 @@ export function MetricControl({
           Number.parseFloat((newValue * multiplier).toFixed(precision)) / multiplier
 
         if (Math.abs(finalValue - valueRef.current) > 1e-6) {
-          onChange(finalValue)
+          applyCommittedValue(finalValue)
         }
       }
     }
 
     window.addEventListener('keydown', handleKeyDown)
     return () => window.removeEventListener('keydown', handleKeyDown)
-  }, [isHovered, isEditing, step, clamp, onChange, precision, multiplier])
+  }, [isHovered, isEditing, step, clamp, applyCommittedValue, precision, multiplier])
 
   const handlePointerDown = useCallback(
     (e: React.PointerEvent) => {
@@ -148,7 +163,14 @@ export function MetricControl({
         document.removeEventListener('pointermove', handlePointerMove)
         document.removeEventListener('pointerup', handlePointerUp)
 
-        if (Math.abs(finalValue - startValueRef.current) > 1e-6) {
+        const changed = Math.abs(finalValue - startValueRef.current) > 1e-6
+        if (onCommit) {
+          if (changed && restoreOnCommit) {
+            onChange(startValueRef.current)
+          }
+          useScene.temporal.getState().resume()
+          onCommit(finalValue)
+        } else if (changed) {
           onChange(startValueRef.current)
           useScene.temporal.getState().resume()
           onChange(finalValue)
@@ -160,7 +182,7 @@ export function MetricControl({
       document.addEventListener('pointermove', handlePointerMove)
       document.addEventListener('pointerup', handlePointerUp)
     },
-    [isEditing, value, onChange, clamp, precision, step, multiplier],
+    [isEditing, value, onChange, onCommit, restoreOnCommit, clamp, precision, step, multiplier],
   )
 
   const handleValueClick = useCallback(() => {
@@ -177,10 +199,10 @@ export function MetricControl({
     if (Number.isNaN(numValue)) {
       setInputValue((value * multiplier).toFixed(precision))
     } else {
-      onChange(clamp(numValue / multiplier))
+      applyCommittedValue(clamp(numValue / multiplier))
     }
     setIsEditing(false)
-  }, [inputValue, onChange, clamp, multiplier, value, precision])
+  }, [inputValue, applyCommittedValue, clamp, multiplier, value, precision])
 
   const handleInputBlur = useCallback(() => {
     submitValue()
@@ -196,16 +218,16 @@ export function MetricControl({
       } else if (e.key === 'ArrowUp') {
         e.preventDefault()
         const newV = clamp(value + step / multiplier)
-        onChange(newV)
+        applyCommittedValue(newV)
         setInputValue((newV * multiplier).toFixed(precision))
       } else if (e.key === 'ArrowDown') {
         e.preventDefault()
         const newV = clamp(value - step / multiplier)
-        onChange(newV)
+        applyCommittedValue(newV)
         setInputValue((newV * multiplier).toFixed(precision))
       }
     },
-    [submitValue, value, multiplier, precision, step, clamp, onChange],
+    [submitValue, value, multiplier, precision, step, clamp, applyCommittedValue],
   )
 
   return (

packages/editor/src/components/ui/panels/ceiling-panel.tsx

@@ -91,7 +91,7 @@ export function CeilingPanel() {
     (index: number) => {
       if (!selectedId) return
       const currentHoles = node?.holes || []
-      if (node?.holeMetadata?.[index]?.source === 'stair') return
+      if ((node?.holeMetadata?.[index]?.source ?? 'manual') !== 'manual') return
       const newHoles = currentHoles.filter((_, i) => i !== index)
       const currentMetadata = currentHoles.map(
         (_, metadataIndex) => node?.holeMetadata?.[metadataIndex] ?? { source: 'manual' as const },
@@ -171,7 +171,8 @@ export function CeilingPanel() {
               const isEditing =
                 editingHole?.nodeId === selectedId && editingHole?.holeIndex === index
               const source = node.holeMetadata?.[index]?.source ?? 'manual'
-              const isAutoHole = source === 'stair'
+              const isAutoHole = source !== 'manual'
+              const autoLabel = source === 'elevator' ? 'Auto elevator cutout' : 'Auto stair cutout'
               return (
                 <div
                   className={`flex items-center justify-between rounded-lg border p-2 transition-colors ${
@@ -189,7 +190,7 @@ export function CeilingPanel() {
                     </p>
                     <p className="text-[10px] text-muted-foreground">
                       {holeArea.toFixed(2)} m² · {hole.length} pts ·{' '}
-                      {isAutoHole ? 'Auto stair cutout' : 'Manual'}
+                      {isAutoHole ? autoLabel : 'Manual'}
                     </p>
                   </div>
                   <div className="flex items-center gap-1">

packages/editor/src/components/ui/panels/elevator-panel.tsx

@@ -0,0 +1,934 @@
+'use client'
+
+import {
+  type AnyNode,
+  type AnyNodeId,
+  type ElevatorNode,
+  ElevatorNode as ElevatorNodeSchema,
+  type LevelNode,
+  requestElevatorLevel,
+  useInteractive,
+  useLiveNodeOverrides,
+  useLiveTransforms,
+  useScene,
+} from '@pascal-app/core'
+import { useViewer } from '@pascal-app/viewer'
+import { Copy, Move, Send, Trash2 } from 'lucide-react'
+import { useCallback, useEffect } from 'react'
+import { useShallow } from 'zustand/react/shallow'
+import { resolveElevatorNodeSupportY, resolveElevatorSupportY } from '../../../lib/elevator-support'
+import { sfxEmitter } from '../../../lib/sfx-bus'
+import useEditor from '../../../store/use-editor'
+import { ActionButton, ActionGroup } from '../controls/action-button'
+import { MetricControl } from '../controls/metric-control'
+import { PanelSection } from '../controls/panel-section'
+import { SliderControl } from '../controls/slider-control'
+import { PanelWrapper } from './panel-wrapper'
+
+function findLevelId(levels: LevelNode[], levelId: string | null | undefined) {
+  if (!levelId) return null
+  return levels.some((level) => level.id === levelId) ? levelId : null
+}
+
+function getLegacyServedLevels(node: ElevatorNode | undefined, levels: LevelNode[]) {
+  if (!node || node.fromLevelId || node.toLevelId || !node.servedLevelIds?.length) return []
+  const servedIds = new Set(node.servedLevelIds)
+  return levels.filter((level) => servedIds.has(level.id))
+}
+
+function getResolvedFromLevelId(node: ElevatorNode | undefined, levels: LevelNode[]) {
+  if (!node) return levels[0]?.id ?? ''
+  const legacyServedLevels = getLegacyServedLevels(node, levels)
+  return (
+    findLevelId(levels, node.fromLevelId) ??
+    legacyServedLevels[0]?.id ??
+    findLevelId(levels, node.defaultLevelId) ??
+    levels[0]?.id ??
+    ''
+  )
+}
+
+function getResolvedToLevelId(
+  node: ElevatorNode | undefined,
+  levels: LevelNode[],
+  fromLevelId: string,
+) {
+  if (!node) return levels[0]?.id ?? ''
+
+  const explicitTo = findLevelId(levels, node.toLevelId)
+  if (explicitTo) return explicitTo
+  const legacyServedLevels = getLegacyServedLevels(node, levels)
+  const legacyTo = legacyServedLevels[legacyServedLevels.length - 1]?.id
+  if (legacyTo) return legacyTo
+
+  const fromIndex = levels.findIndex((level) => level.id === fromLevelId)
+  const fallbackIndex = fromIndex >= 0 ? Math.min(fromIndex + 1, levels.length - 1) : 0
+  return levels[fallbackIndex]?.id ?? fromLevelId
+}
+
+function getServiceLevels(levels: LevelNode[], fromLevelId: string, toLevelId: string) {
+  const fromIndex = levels.findIndex((level) => level.id === fromLevelId)
+  const toIndex = levels.findIndex((level) => level.id === toLevelId)
+  if (fromIndex < 0 && toIndex < 0) return []
+
+  const resolvedFromIndex = fromIndex >= 0 ? fromIndex : toIndex
+  const resolvedToIndex =
+    toIndex >= 0 ? toIndex : Math.min(Math.max(resolvedFromIndex, 0) + 1, levels.length - 1)
+  const minIndex = Math.min(resolvedFromIndex, resolvedToIndex)
+  const maxIndex = Math.max(resolvedFromIndex, resolvedToIndex)
+
+  return levels.slice(minIndex, maxIndex + 1)
+}
+
+function stripDuplicateFlags(metadata: ElevatorNode['metadata']) {
+  if (typeof metadata !== 'object' || metadata === null || Array.isArray(metadata)) {
+    return metadata
+  }
+
+  const nextMeta = { ...(metadata as Record<string, unknown>) }
+  delete nextMeta.isNew
+  delete nextMeta.isTransient
+  return nextMeta as ElevatorNode['metadata']
+}
+
+type ElevatorMetricKey =
+  | 'width'
+  | 'depth'
+  | 'shaftWidth'
+  | 'shaftDepth'
+  | 'shaftWallThickness'
+  | 'cabHeight'
+  | 'doorWidth'
+  | 'doorHeight'
+
+type ElevatorAccessField = 'disabledLevelIds' | 'serviceOnlyLevelIds'
+
+const DOOR_STYLE_OPTIONS: Array<{
+  label: string
+  value: ElevatorNode['doorStyle']
+}> = [
+  { label: 'Center opening', value: 'center-opening' },
+  { label: 'Single left', value: 'single-left' },
+  { label: 'Single right', value: 'single-right' },
+]
+
+const DOOR_PANEL_STYLE_OPTIONS: Array<{
+  label: string
+  value: ElevatorNode['doorPanelStyle']
+}> = [
+  { label: 'Glass frame', value: 'glass-frame' },
+  { label: 'Solid panel', value: 'solid-panel' },
+  { label: 'Segmented panel', value: 'segmented-panel' },
+]
+
+const SHAFT_STYLE_OPTIONS: Array<{
+  label: string
+  value: ElevatorNode['shaftStyle']
+}> = [
+  { label: 'Solid', value: 'solid' },
+  { label: 'Glass', value: 'glass' },
+]
+
+function roundMeters(value: number) {
+  return Math.round(value * 100) / 100
+}
+
+function getResolvedShaftWidth(node: ElevatorNode) {
+  return Math.max(node.shaftWidth ?? node.width, node.width, 0.8)
+}
+
+function getResolvedShaftDepth(node: ElevatorNode) {
+  return Math.max(node.shaftDepth ?? node.depth, node.depth, 0.8)
+}
+
+function getResolvedShaftWallThickness(node: ElevatorNode) {
+  return Math.max(node.shaftWallThickness ?? 0.09, 0.04)
+}
+
+function radiansToDegrees(radians: number) {
+  return Math.round((radians * 180) / Math.PI)
+}
+
+function degreesToRadians(degrees: number) {
+  return (degrees * Math.PI) / 180
+}
+
+export function ElevatorPanel() {
+  const selectedId = useViewer((s) => s.selection.selectedIds[0])
+  const selectedCount = useViewer((s) => s.selection.selectedIds.length)
+  const setSelection = useViewer((s) => s.setSelection)
+  const updateNode = useScene((s) => s.updateNode)
+  const createNode = useScene((s) => s.createNode)
+  const setMovingNode = useEditor((s) => s.setMovingNode)
+  const runtime = useInteractive(
+    useShallow((s) => {
+      const state = selectedId ? s.elevators[selectedId as AnyNodeId] : null
+      if (!state) return null
+      return {
+        currentLevelId: state.currentLevelId,
+        queue: state.queue,
+        targetLevelId: state.targetLevelId,
+      }
+    }),
+  )
+
+  const node = useScene((s) =>
+    selectedId ? (s.nodes[selectedId as AnyNode['id']] as ElevatorNode | undefined) : undefined,
+  )
+  const liveOverrides = useLiveNodeOverrides((s) =>
+    selectedId ? s.get(selectedId as AnyNodeId) : undefined,
+  )
+  const liveTransform = useLiveTransforms((s) =>
+    selectedId ? s.get(selectedId as AnyNodeId) : undefined,
+  )
+
+  useEffect(() => {
+    return () => {
+      if (!selectedId) return
+      useLiveNodeOverrides.getState().clear(selectedId as AnyNodeId)
+      useLiveTransforms.getState().clear(selectedId as AnyNodeId)
+    }
+  }, [selectedId])
+
+  const levels = useScene(
+    useShallow((s) => {
+      if (!(node?.parentId && s.nodes[node.parentId as AnyNodeId]?.type === 'building')) return []
+      const building = s.nodes[node.parentId as AnyNodeId]
+      if (building?.type !== 'building') return []
+      return building.children
+        .map((childId) => s.nodes[childId as AnyNodeId])
+        .filter((entry): entry is LevelNode => entry?.type === 'level')
+        .sort((left, right) => left.level - right.level)
+    }),
+  )
+
+  const handleUpdate = useCallback(
+    (updates: Partial<ElevatorNode>) => {
+      if (!selectedId) return
+      updateNode(selectedId as AnyNode['id'], updates)
+    },
+    [selectedId, updateNode],
+  )
+
+  const clearLivePreview = useCallback(() => {
+    if (!selectedId) return
+    useLiveNodeOverrides.getState().clear(selectedId as AnyNodeId)
+    useLiveTransforms.getState().clear(selectedId as AnyNodeId)
+  }, [selectedId])
+
+  useEffect(() => {
+    if (!(selectedId && node?.type === 'elevator')) return
+    const supportY = resolveElevatorNodeSupportY(node)
+    if (node.position[1] >= supportY - 1e-4) return
+
+    updateNode(selectedId as AnyNode['id'], {
+      position: [node.position[0], supportY, node.position[2]],
+    })
+  }, [
+    node?.defaultLevelId,
+    node?.fromLevelId,
+    node?.id,
+    node?.parentId,
+    node?.position[0],
+    node?.position[1],
+    node?.position[2],
+    node?.type,
+    selectedId,
+    updateNode,
+  ])
+
+  const previewMetric = useCallback(
+    <K extends ElevatorMetricKey>(key: K, value: ElevatorNode[K]) => {
+      if (!selectedId) return
+      useLiveNodeOverrides.getState().set(selectedId as AnyNodeId, { [key]: value })
+    },
+    [selectedId],
+  )
+
+  const commitMetric = useCallback(
+    <K extends ElevatorMetricKey>(key: K, value: ElevatorNode[K]) => {
+      if (!selectedId) return
+
+      const hasChange = !(node && Math.abs(Number(node[key]) - Number(value)) <= 1e-6)
+      if (hasChange) {
+        updateNode(selectedId as AnyNode['id'], { [key]: value } as Partial<ElevatorNode>)
+      }
+      useLiveNodeOverrides.getState().clear(selectedId as AnyNodeId)
+    },
+    [node, selectedId, updateNode],
+  )
+
+  const previewTransform = useCallback(
+    (position: ElevatorNode['position'], rotation: ElevatorNode['rotation']) => {
+      if (!selectedId) return
+      useLiveTransforms.getState().set(selectedId as AnyNodeId, { position, rotation })
+    },
+    [selectedId],
+  )
+
+  const commitTransform = useCallback(
+    (position: ElevatorNode['position'], rotation: ElevatorNode['rotation']) => {
+      if (!(selectedId && node)) return
+      useLiveTransforms.getState().clear(selectedId as AnyNodeId)
+      const positionChanged = node.position.some(
+        (value, index) => Math.abs(value - position[index]!) > 1e-6,
+      )
+      const rotationChanged = Math.abs(node.rotation - rotation) > 1e-6
+      if (positionChanged || rotationChanged) {
+        updateNode(selectedId as AnyNode['id'], { position, rotation })
+      }
+    },
+    [node, selectedId, updateNode],
+  )
+
+  const getSupportedPosition = useCallback(
+    (x: number, z: number): ElevatorNode['position'] => {
+      if (!node) return [x, 0, z]
+      const supportY = resolveElevatorSupportY({
+        buildingId: node.parentId,
+        preferredLevelId: node.fromLevelId ?? node.defaultLevelId,
+        x,
+        z,
+      })
+      return [x, supportY, z]
+    },
+    [node],
+  )
+
+  const handleClose = useCallback(() => {
+    clearLivePreview()
+    setSelection({ selectedIds: [] })
+  }, [clearLivePreview, setSelection])
+
+  const handleMove = useCallback(() => {
+    if (!node) return
+    sfxEmitter.emit('sfx:item-pick')
+    clearLivePreview()
+    setMovingNode(node)
+    setSelection({ selectedIds: [] })
+  }, [clearLivePreview, node, setMovingNode, setSelection])
+
+  const handleDuplicate = useCallback(() => {
+    if (!(node && node.parentId)) return
+    sfxEmitter.emit('sfx:item-pick')
+
+    const duplicate = ElevatorNodeSchema.parse({
+      ...structuredClone(node),
+      id: undefined,
+      name: node.name ? `${node.name} Copy` : 'Elevator Copy',
+      position: [node.position[0] + 1, node.position[1], node.position[2] + 1],
+      metadata: { ...(stripDuplicateFlags(node.metadata) as Record<string, unknown>), isNew: true },
+    })
+
+    createNode(duplicate, node.parentId as AnyNodeId)
+    clearLivePreview()
+    setMovingNode(duplicate)
+    setSelection({ selectedIds: [] })
+  }, [clearLivePreview, node, createNode, setMovingNode, setSelection])
+
+  const handleDelete = useCallback(() => {
+    if (!(selectedId && node)) return
+    sfxEmitter.emit('sfx:structure-delete')
+    clearLivePreview()
+    useScene.getState().deleteNode(selectedId as AnyNodeId)
+    setSelection({ selectedIds: [] })
+  }, [clearLivePreview, selectedId, node, setSelection])
+
+  const requestLevel = useCallback(
+    (levelId: LevelNode['id']) => {
+      if (!node) return
+      if ((node.disabledLevelIds ?? []).includes(levelId)) return
+      requestElevatorLevel(node.id as AnyNodeId, levelId as AnyNodeId)
+    },
+    [node],
+  )
+
+  const toggleLevelAccess = useCallback(
+    (field: ElevatorAccessField, levelId: LevelNode['id']) => {
+      if (!node) return
+      const disabledIds = new Set(node.disabledLevelIds ?? [])
+      const serviceOnlyIds = new Set(node.serviceOnlyLevelIds ?? [])
+      const targetSet = field === 'disabledLevelIds' ? disabledIds : serviceOnlyIds
+
+      if (targetSet.has(levelId)) {
+        targetSet.delete(levelId)
+      } else {
+        targetSet.add(levelId)
+      }
+
+      if (field === 'disabledLevelIds' && disabledIds.has(levelId)) {
+        serviceOnlyIds.delete(levelId)
+      }
+      if (field === 'serviceOnlyLevelIds' && serviceOnlyIds.has(levelId)) {
+        disabledIds.delete(levelId)
+      }
+
+      const nextServiceLevels = getServiceLevels(
+        levels,
+        getResolvedFromLevelId(node, levels),
+        getResolvedToLevelId(node, levels, getResolvedFromLevelId(node, levels)),
+      )
+      const nextDefaultLevelId =
+        node.defaultLevelId && !disabledIds.has(node.defaultLevelId)
+          ? node.defaultLevelId
+          : (nextServiceLevels.find((level) => !disabledIds.has(level.id))?.id ??
+            nextServiceLevels[0]?.id ??
+            null)
+
+      handleUpdate({
+        defaultLevelId: nextDefaultLevelId,
+        disabledLevelIds: Array.from(disabledIds),
+        serviceOnlyLevelIds: Array.from(serviceOnlyIds),
+      })
+    },
+    [handleUpdate, levels, node],
+  )
+
+  const handleServiceBoundaryChange = useCallback(
+    (field: 'fromLevelId' | 'toLevelId', levelId: string) => {
+      if (!node) return
+      const nextFromLevelId =
+        field === 'fromLevelId' ? levelId : getResolvedFromLevelId(node, levels)
+      const nextToLevelId =
+        field === 'toLevelId' ? levelId : getResolvedToLevelId(node, levels, nextFromLevelId)
+      const nextServedLevels = getServiceLevels(levels, nextFromLevelId, nextToLevelId)
+      const currentDefaultIsServed = nextServedLevels.some(
+        (level) => level.id === node.defaultLevelId,
+      )
+
+      handleUpdate({
+        [field]: levelId || null,
+        defaultLevelId: currentDefaultIsServed
+          ? node.defaultLevelId
+          : nextFromLevelId || nextServedLevels[0]?.id || null,
+        ...(field === 'fromLevelId'
+          ? {
+              position: [
+                node.position[0],
+                resolveElevatorSupportY({
+                  buildingId: node.parentId,
+                  preferredLevelId: nextFromLevelId,
+                  x: node.position[0],
+                  z: node.position[2],
+                }),
+                node.position[2],
+              ] as ElevatorNode['position'],
+            }
+          : {}),
+        servedLevelIds: undefined,
+      } as Partial<ElevatorNode>)
+    },
+    [node, levels, handleUpdate],
+  )
+
+  if (!(node && node.type === 'elevator' && selectedId && selectedCount === 1)) return null
+
+  const displayNode = liveOverrides ? ({ ...node, ...liveOverrides } as ElevatorNode) : node
+  const displayPosition = liveTransform?.position ?? displayNode.position
+  const displayRotation = liveTransform?.rotation ?? displayNode.rotation
+  const displayRotationDegrees = radiansToDegrees(displayRotation)
+  const displayShaftWidth = getResolvedShaftWidth(displayNode)
+  const displayShaftDepth = getResolvedShaftDepth(displayNode)
+  const displayShaftWallThickness = getResolvedShaftWallThickness(displayNode)
+  const fromLevelId = getResolvedFromLevelId(node, levels)
+  const toLevelId = getResolvedToLevelId(node, levels, fromLevelId)
+  const servedLevels = getServiceLevels(levels, fromLevelId, toLevelId)
+  const servedLevelIdSet = new Set<string>(servedLevels.map((level) => level.id))
+  const disabledLevelIds = new Set(
+    (node.disabledLevelIds ?? []).filter((levelId) => servedLevelIdSet.has(levelId)),
+  )
+  const serviceOnlyLevelIds = new Set(
+    (node.serviceOnlyLevelIds ?? []).filter((levelId) => servedLevelIdSet.has(levelId)),
+  )
+  const enabledServedLevels = servedLevels.filter((level) => !disabledLevelIds.has(level.id))
+  const defaultLevelOptions =
+    enabledServedLevels.length > 0 ? enabledServedLevels : servedLevels.length > 0 ? servedLevels : levels
+  const selectedDefaultLevelId = defaultLevelOptions.some(
+    (level) => level.id === node.defaultLevelId,
+  )
+    ? (node.defaultLevelId ?? '')
+    : fromLevelId
+  const activeLevelId =
+    runtime?.currentLevelId ??
+    (servedLevels.some((level) => level.id === node.defaultLevelId)
+      ? node.defaultLevelId
+      : fromLevelId || levels[0]?.id) ??
+    null
+  const destinationOrderByLevelId = new Map<string, number>()
+  const orderedDestinationIds: string[] = []
+  if (runtime?.targetLevelId) orderedDestinationIds.push(runtime.targetLevelId)
+  for (const levelId of runtime?.queue ?? []) {
+    if (!orderedDestinationIds.includes(levelId)) orderedDestinationIds.push(levelId)
+  }
+  orderedDestinationIds.forEach((levelId, index) => {
+    destinationOrderByLevelId.set(levelId, index + 1)
+  })
+
+  return (
+    <PanelWrapper
+      icon="/icons/elevator.svg"
+      onClose={handleClose}
+      title={node.name || 'Elevator'}
+      width={300}
+    >
+      <PanelSection title="Actions">
+        <ActionGroup>
+          <ActionButton icon={<Move className="h-3.5 w-3.5" />} label="Move" onClick={handleMove} />
+          <ActionButton
+            icon={<Copy className="h-3.5 w-3.5" />}
+            label="Duplicate"
+            onClick={handleDuplicate}
+          />
+          <ActionButton
+            className="text-destructive hover:text-destructive"
+            icon={<Trash2 className="h-3.5 w-3.5" />}
+            label="Delete"
+            onClick={handleDelete}
+          />
+        </ActionGroup>
+      </PanelSection>
+
+      <PanelSection title="Position">
+        <SliderControl
+          label="X"
+          max={50}
+          min={-50}
+          onChange={(value) => {
+            const position = getSupportedPosition(value, displayPosition[2])
+            previewTransform(position, displayRotation)
+          }}
+          onCommit={(value) => {
+            const position = getSupportedPosition(value, displayPosition[2])
+            commitTransform(position, displayRotation)
+          }}
+          precision={2}
+          restoreOnCommit={false}
+          step={0.05}
+          unit="m"
+          value={roundMeters(displayPosition[0])}
+        />
+        <SliderControl
+          label="Y"
+          max={50}
+          min={-50}
+          onChange={(value) => {
+            const position: ElevatorNode['position'] = [
+              displayPosition[0],
+              value,
+              displayPosition[2],
+            ]
+            previewTransform(position, displayRotation)
+          }}
+          onCommit={(value) => {
+            const position: ElevatorNode['position'] = [
+              displayPosition[0],
+              value,
+              displayPosition[2],
+            ]
+            commitTransform(position, displayRotation)
+          }}
+          precision={2}
+          restoreOnCommit={false}
+          step={0.05}
+          unit="m"
+          value={roundMeters(displayPosition[1])}
+        />
+        <SliderControl
+          label="Z"
+          max={50}
+          min={-50}
+          onChange={(value) => {
+            const position = getSupportedPosition(displayPosition[0], value)
+            previewTransform(position, displayRotation)
+          }}
+          onCommit={(value) => {
+            const position = getSupportedPosition(displayPosition[0], value)
+            commitTransform(position, displayRotation)
+          }}
+          precision={2}
+          restoreOnCommit={false}
+          step={0.05}
+          unit="m"
+          value={roundMeters(displayPosition[2])}
+        />
+      </PanelSection>
+
+      <PanelSection title="Rotation">
+        <SliderControl
+          label="Yaw"
+          max={180}
+          min={-180}
+          onChange={(degrees) => previewTransform(displayPosition, degreesToRadians(degrees))}
+          onCommit={(degrees) => commitTransform(displayPosition, degreesToRadians(degrees))}
+          precision={0}
+          restoreOnCommit={false}
+          step={1}
+          unit="°"
+          value={displayRotationDegrees}
+        />
+        <div className="flex gap-1.5 px-1 pt-2 pb-1">
+          <ActionButton
+            label="-45°"
+            onClick={() => {
+              sfxEmitter.emit('sfx:item-rotate')
+              commitTransform(displayPosition, displayRotation - Math.PI / 4)
+            }}
+          />
+          <ActionButton
+            label="+45°"
+            onClick={() => {
+              sfxEmitter.emit('sfx:item-rotate')
+              commitTransform(displayPosition, displayRotation + Math.PI / 4)
+            }}
+          />
+        </div>
+      </PanelSection>
+
+      <PanelSection title="Cab">
+        <MetricControl
+          label="Width"
+          max={4}
+          min={0.8}
+          onChange={(value) => previewMetric('width', value)}
+          onCommit={(value) => commitMetric('width', value)}
+          precision={2}
+          restoreOnCommit={false}
+          step={0.05}
+          unit="m"
+          value={displayNode.width}
+        />
+        <MetricControl
+          label="Depth"
+          max={4}
+          min={0.8}
+          onChange={(value) => previewMetric('depth', value)}
+          onCommit={(value) => commitMetric('depth', value)}
+          precision={2}
+          restoreOnCommit={false}
+          step={0.05}
+          unit="m"
+          value={displayNode.depth}
+        />
+        <MetricControl
+          label="Cab Height"
+          max={4}
+          min={1.8}
+          onChange={(value) => previewMetric('cabHeight', value)}
+          onCommit={(value) => commitMetric('cabHeight', value)}
+          precision={2}
+          restoreOnCommit={false}
+          step={0.05}
+          unit="m"
+          value={displayNode.cabHeight}
+        />
+      </PanelSection>
+
+      <PanelSection title="Shaft">
+        <div className="space-y-1.5">
+          <div className="px-1 text-[11px] uppercase tracking-[0.14em] text-muted-foreground">
+            Shaft Style
+          </div>
+          <select
+            className="h-9 w-full rounded-lg border border-border/50 bg-[#2C2C2E] px-3 text-sm text-foreground"
+            onChange={(event) =>
+              handleUpdate({ shaftStyle: event.target.value as ElevatorNode['shaftStyle'] })
+            }
+            value={displayNode.shaftStyle ?? 'solid'}
+          >
+            {SHAFT_STYLE_OPTIONS.map((option) => (
+              <option key={option.value} value={option.value}>
+                {option.label}
+              </option>
+            ))}
+          </select>
+        </div>
+        <MetricControl
+          label="Shaft Width"
+          max={5}
+          min={displayNode.width}
+          onChange={(value) => previewMetric('shaftWidth', Math.max(value, displayNode.width))}
+          onCommit={(value) => commitMetric('shaftWidth', Math.max(value, displayNode.width))}
+          precision={2}
+          restoreOnCommit={false}
+          step={0.05}
+          unit="m"
+          value={displayShaftWidth}
+        />
+        <MetricControl
+          label="Shaft Depth"
+          max={5}
+          min={displayNode.depth}
+          onChange={(value) => previewMetric('shaftDepth', Math.max(value, displayNode.depth))}
+          onCommit={(value) => commitMetric('shaftDepth', Math.max(value, displayNode.depth))}
+          precision={2}
+          restoreOnCommit={false}
+          step={0.05}
+          unit="m"
+          value={displayShaftDepth}
+        />
+        <MetricControl
+          label="Wall Thickness"
+          max={0.4}
+          min={0.04}
+          onChange={(value) => previewMetric('shaftWallThickness', value)}
+          onCommit={(value) => commitMetric('shaftWallThickness', value)}
+          precision={2}
+          restoreOnCommit={false}
+          step={0.01}
+          unit="m"
+          value={displayShaftWallThickness}
+        />
+      </PanelSection>
+
+      <PanelSection title="Doors">
+        <div className="space-y-1.5">
+          <div className="px-1 text-[11px] uppercase tracking-[0.14em] text-muted-foreground">
+            Opening Style
+          </div>
+          <select
+            className="h-9 w-full rounded-lg border border-border/50 bg-[#2C2C2E] px-3 text-sm text-foreground"
+            onChange={(event) =>
+              handleUpdate({ doorStyle: event.target.value as ElevatorNode['doorStyle'] })
+            }
+            value={displayNode.doorStyle ?? 'center-opening'}
+          >
+            {DOOR_STYLE_OPTIONS.map((option) => (
+              <option key={option.value} value={option.value}>
+                {option.label}
+              </option>
+            ))}
+          </select>
+        </div>
+        <div className="space-y-1.5">
+          <div className="px-1 text-[11px] uppercase tracking-[0.14em] text-muted-foreground">
+            Door Type
+          </div>
+          <select
+            className="h-9 w-full rounded-lg border border-border/50 bg-[#2C2C2E] px-3 text-sm text-foreground"
+            onChange={(event) =>
+              handleUpdate({
+                doorPanelStyle: event.target.value as ElevatorNode['doorPanelStyle'],
+              })
+            }
+            value={displayNode.doorPanelStyle ?? 'glass-frame'}
+          >
+            {DOOR_PANEL_STYLE_OPTIONS.map((option) => (
+              <option key={option.value} value={option.value}>
+                {option.label}
+              </option>
+            ))}
+          </select>
+        </div>
+        <MetricControl
+          label="Door Width"
+          max={Math.max(displayNode.width - 0.1, 0.5)}
+          min={0.45}
+          onChange={(value) => previewMetric('doorWidth', value)}
+          onCommit={(value) => commitMetric('doorWidth', value)}
+          precision={2}
+          restoreOnCommit={false}
+          step={0.05}
+          unit="m"
+          value={displayNode.doorWidth}
+        />
+        <MetricControl
+          label="Door Height"
+          max={Math.max(displayNode.cabHeight - 0.1, 1.3)}
+          min={1.2}
+          onChange={(value) => previewMetric('doorHeight', value)}
+          onCommit={(value) => commitMetric('doorHeight', value)}
+          precision={2}
+          restoreOnCommit={false}
+          step={0.05}
+          unit="m"
+          value={displayNode.doorHeight}
+        />
+      </PanelSection>
+
+      <PanelSection title="Service">
+        <div className="grid grid-cols-2 gap-2">
+          <div className="space-y-1.5">
+            <div className="px-1 text-[11px] uppercase tracking-[0.14em] text-muted-foreground">
+              From
+            </div>
+            <select
+              className="h-9 w-full rounded-lg border border-border/50 bg-[#2C2C2E] px-2 text-sm text-foreground"
+              onChange={(event) =>
+                handleServiceBoundaryChange('fromLevelId', event.target.value)
+              }
+              value={fromLevelId}
+            >
+              {levels.map((level) => (
+                <option key={level.id} value={level.id}>
+                  {level.name || `Level ${level.level}`}
+                </option>
+              ))}
+            </select>
+          </div>
+
+          <div className="space-y-1.5">
+            <div className="px-1 text-[11px] uppercase tracking-[0.14em] text-muted-foreground">
+              To
+            </div>
+            <select
+              className="h-9 w-full rounded-lg border border-border/50 bg-[#2C2C2E] px-2 text-sm text-foreground"
+              onChange={(event) => handleServiceBoundaryChange('toLevelId', event.target.value)}
+              value={toLevelId}
+            >
+              {levels.map((level) => (
+                <option key={level.id} value={level.id}>
+                  {level.name || `Level ${level.level}`}
+                </option>
+              ))}
+            </select>
+          </div>
+        </div>
+
+        <div className="space-y-1.5">
+          <div className="px-1 text-[11px] uppercase tracking-[0.14em] text-muted-foreground">
+            Default Floor
+          </div>
+          <select
+            className="h-9 w-full rounded-lg border border-border/50 bg-[#2C2C2E] px-3 text-sm text-foreground"
+            onChange={(event) => handleUpdate({ defaultLevelId: event.target.value || null })}
+            value={selectedDefaultLevelId}
+          >
+            {defaultLevelOptions.map((level) => (
+              <option key={level.id} value={level.id}>
+                {level.name || `Level ${level.level}`}
+              </option>
+            ))}
+          </select>
+        </div>
+      </PanelSection>
+
+      <PanelSection title="Access">
+        <div className="space-y-2">
+          {servedLevels.map((level) => {
+            const isDisabled = disabledLevelIds.has(level.id)
+            const isServiceOnly = serviceOnlyLevelIds.has(level.id)
+
+            return (
+              <div
+                className="flex items-center justify-between gap-2 rounded-lg border border-border/45 bg-[#2C2C2E] px-2.5 py-2"
+                key={level.id}
+              >
+                <span className="min-w-0 truncate text-sm">
+                  {level.name || `Level ${level.level}`}
+                </span>
+                <div className="flex shrink-0 gap-1.5">
+                  <button
+                    className={`rounded-md border px-2 py-1 text-[11px] transition-colors ${
+                      isServiceOnly
+                        ? 'border-sky-300/45 bg-sky-400/15 text-sky-100'
+                        : 'border-border/50 bg-black/15 text-muted-foreground hover:text-foreground'
+                    } ${isDisabled ? 'cursor-not-allowed opacity-45' : ''}`}
+                    disabled={isDisabled}
+                    onClick={() => toggleLevelAccess('serviceOnlyLevelIds', level.id)}
+                    type="button"
+                  >
+                    Service
+                  </button>
+                  <button
+                    className={`rounded-md border px-2 py-1 text-[11px] transition-colors ${
+                      isDisabled
+                        ? 'border-red-300/45 bg-red-400/15 text-red-100'
+                        : 'border-border/50 bg-black/15 text-muted-foreground hover:text-foreground'
+                    }`}
+                    onClick={() => toggleLevelAccess('disabledLevelIds', level.id)}
+                    type="button"
+                  >
+                    Disabled
+                  </button>
+                </div>
+              </div>
+            )
+          })}
+        </div>
+      </PanelSection>
+
+      <PanelSection title="Destination">
+        <div className="grid grid-cols-2 gap-1.5">
+          {servedLevels.map((level) => {
+            const isActive = activeLevelId === level.id
+            const stopOrder = destinationOrderByLevelId.get(level.id)
+            const isDisabled = disabledLevelIds.has(level.id)
+            const isServiceOnly = serviceOnlyLevelIds.has(level.id)
+            return (
+              <button
+                className={`flex min-h-11 items-center justify-between gap-2 rounded-lg border px-2.5 text-left transition-colors ${
+                  isDisabled
+                    ? 'cursor-not-allowed border-border/35 bg-[#202024] text-muted-foreground/55'
+                    : isActive
+                      ? 'border-emerald-400/45 bg-emerald-400/15 text-emerald-100'
+                      : 'border-border/50 bg-[#2C2C2E] text-foreground hover:bg-[#3e3e3e]'
+                }`}
+                disabled={isDisabled}
+                key={level.id}
+                onClick={() => requestLevel(level.id)}
+                type="button"
+              >
+                <span className="flex min-w-0 flex-col">
+                  <span className="truncate text-xs">{level.name || `Level ${level.level}`}</span>
+                  {isDisabled ? (
+                    <span className="mt-0.5 text-[10px] font-medium uppercase tracking-[0.12em] text-current/65">
+                      Disabled
+                    </span>
+                  ) : isServiceOnly ? (
+                    <span className="mt-0.5 text-[10px] font-medium uppercase tracking-[0.12em] text-current/65">
+                      Service
+                    </span>
+                  ) : (
+                    stopOrder && (
+                      <span className="mt-0.5 text-[10px] font-medium uppercase tracking-[0.12em] text-current/65">
+                        Stop {stopOrder}
+                      </span>
+                    )
+                  )}
+                </span>
+                <span
+                  className={`flex h-6 min-w-6 items-center justify-center rounded-full border border-white/15 bg-black/20 ${
+                    stopOrder ? 'px-1.5 font-mono text-[11px] font-semibold' : ''
+                  }`}
+                >
+                  {isDisabled ? '×' : (stopOrder ?? <Send className="h-3 w-3" />)}
+                </span>
+              </button>
+            )
+          })}
+        </div>
+      </PanelSection>
+
+      <PanelSection title="Motion">
+        <SliderControl
+          label="Speed"
+          max={8}
+          min={0.5}
+          onChange={(value) => handleUpdate({ speed: value })}
+          precision={1}
+          step={0.1}
+          unit="m/s"
+          value={node.speed}
+        />
+        <SliderControl
+          label="Door Time"
+          max={2200}
+          min={300}
+          onChange={(value) => handleUpdate({ doorDurationMs: value })}
+          step={50}
+          unit="ms"
+          value={node.doorDurationMs}
+        />
+        <SliderControl
+          label="Dwell"
+          max={5000}
+          min={300}
+          onChange={(value) => handleUpdate({ dwellMs: value })}
+          step={100}
+          unit="ms"
+          value={node.dwellMs}
+        />
+      </PanelSection>
+    </PanelWrapper>
+  )
+}

packages/editor/src/components/ui/panels/node-display.ts

@@ -13,6 +13,7 @@ const TYPE_DEFAULTS: Record<string, NodeDisplay> = {
   slab: { icon: '/icons/floor.png', label: 'Slab' },
   ceiling: { icon: '/icons/ceiling.png', label: 'Ceiling' },
   column: { icon: '/icons/column.png', label: 'Column' },
+  elevator: { icon: '/icons/elevator.svg', label: 'Elevator' },
   fence: { icon: '/icons/fence.png', label: 'Fence' },
   roof: { icon: '/icons/roof.png', label: 'Roof' },
   'roof-segment': { icon: '/icons/roof.png', label: 'Roof segment' },

packages/editor/src/components/ui/panels/panel-manager.tsx

@@ -7,6 +7,7 @@ import {
   type CeilingNode,
   type ColumnNode,
   type DoorNode,
+  type ElevatorNode,
   type FenceNode,
   type ItemNode,
   type RoofNode,
@@ -26,6 +27,7 @@ import useEditor from '../../../store/use-editor'
 import { CeilingPanel } from './ceiling-panel'
 import { ColumnPanel } from './column-panel'
 import { DoorPanel } from './door-panel'
+import { ElevatorPanel } from './elevator-panel'
 import { FencePanel } from './fence-panel'
 import { ItemPanel } from './item-panel'
 import { MobilePanelSheet } from './mobile-panel-sheet'
@@ -46,6 +48,7 @@ type MovableNode =
   | ItemNode
   | WindowNode
   | DoorNode
+  | ElevatorNode
   | CeilingNode
   | ColumnNode
   | SlabNode
@@ -61,6 +64,7 @@ const MOVABLE_TYPES = new Set<string>([
   'item',
   'window',
   'door',
+  'elevator',
   'ceiling',
   'column',
   'slab',
@@ -104,6 +108,8 @@ function panelForType(type: string | null) {
       return <FencePanel />
     case 'door':
       return <DoorPanel />
+    case 'elevator':
+      return <ElevatorPanel />
     case 'window':
       return <WindowPanel />
     default:
@@ -239,6 +245,5 @@ export function PanelManager() {
     return <PaintPanel />
   }
 
-  // Show appropriate panel based on selected node type
   return panelForType(selectedNodeType)
 }

packages/editor/src/components/ui/panels/slab-panel.tsx

@@ -91,7 +91,7 @@ export function SlabPanel() {
     (index: number) => {
       if (!selectedId) return
       const currentHoles = node?.holes || []
-      if (node?.holeMetadata?.[index]?.source === 'stair') return
+      if ((node?.holeMetadata?.[index]?.source ?? 'manual') !== 'manual') return
       const newHoles = currentHoles.filter((_, i) => i !== index)
       const currentMetadata = currentHoles.map(
         (_, metadataIndex) => node?.holeMetadata?.[metadataIndex] ?? { source: 'manual' as const },
@@ -173,7 +173,8 @@ export function SlabPanel() {
               const isEditing =
                 editingHole?.nodeId === selectedId && editingHole?.holeIndex === index
               const source = node.holeMetadata?.[index]?.source ?? 'manual'
-              const isAutoHole = source === 'stair'
+              const isAutoHole = source !== 'manual'
+              const autoLabel = source === 'elevator' ? 'Auto elevator cutout' : 'Auto stair cutout'
               return (
                 <div
                   className={`flex items-center justify-between rounded-lg border p-2 transition-colors ${
@@ -191,7 +192,7 @@ export function SlabPanel() {
                     </p>
                     <p className="text-[10px] text-muted-foreground">
                       {holeArea.toFixed(2)} m² · {hole.length} pts ·{' '}
-                      {isAutoHole ? 'Auto stair cutout' : 'Manual'}
+                      {isAutoHole ? autoLabel : 'Manual'}
                     </p>
                   </div>
                   <div className="flex items-center gap-1">

packages/editor/src/components/ui/sidebar/panels/site-panel/building-tree-node.tsx

@@ -39,8 +39,10 @@ export const BuildingTreeNode = memo(function BuildingTreeNode({
 
   const handleAddLevel = (e: React.MouseEvent) => {
     e.stopPropagation()
+    const nodes = useScene.getState().nodes
+    const levelCount = children.filter((childId) => nodes[childId]?.type === 'level').length
     const newLevel = LevelNode.parse({
-      level: children.length,
+      level: levelCount,
       children: [],
       parentId: nodeId,
     })

packages/editor/src/components/ui/sidebar/panels/site-panel/elevator-tree-node.tsx

@@ -0,0 +1,75 @@
+import { type AnyNodeId, type ElevatorNode, useScene } from '@pascal-app/core'
+import { useViewer } from '@pascal-app/viewer'
+import Image from 'next/image'
+import { memo, useCallback, useState } from 'react'
+import useEditor from './../../../../../store/use-editor'
+import { InlineRenameInput } from './inline-rename-input'
+import { focusTreeNode, handleTreeSelection, TreeNodeWrapper } from './tree-node'
+import { TreeNodeActions } from './tree-node-actions'
+
+interface ElevatorTreeNodeProps {
+  nodeId: AnyNodeId
+  depth: number
+  isLast?: boolean
+}
+
+export const ElevatorTreeNode = memo(function ElevatorTreeNode({
+  nodeId,
+  depth,
+  isLast,
+}: ElevatorTreeNodeProps) {
+  const [isEditing, setIsEditing] = useState(false)
+  const isVisible = useScene((s) => s.nodes[nodeId]?.visible !== false)
+  const node = useScene((s) => s.nodes[nodeId] as ElevatorNode | undefined)
+  const isSelected = useViewer((state) => state.selection.selectedIds.includes(nodeId))
+  const isHovered = useViewer((state) => state.hoveredId === nodeId)
+  const setSelection = useViewer((state) => state.setSelection)
+  const setHoveredId = useViewer((state) => state.setHoveredId)
+
+  const handleClick = useCallback(
+    (event: React.MouseEvent) => {
+      event.stopPropagation()
+      const handled = handleTreeSelection(
+        event,
+        nodeId,
+        useViewer.getState().selection.selectedIds,
+        setSelection,
+      )
+      if (!handled && useEditor.getState().phase === 'furnish') {
+        useEditor.getState().setPhase('structure')
+      }
+    },
+    [nodeId, setSelection],
+  )
+
+  return (
+    <TreeNodeWrapper
+      actions={<TreeNodeActions nodeId={nodeId} />}
+      depth={depth}
+      expanded={false}
+      hasChildren={false}
+      icon={
+        <Image alt="" className="object-contain" height={14} src="/icons/elevator.svg" width={14} />
+      }
+      isHovered={isHovered}
+      isLast={isLast}
+      isSelected={isSelected}
+      isVisible={isVisible}
+      label={
+        <InlineRenameInput
+          defaultName={node?.name || 'Elevator'}
+          isEditing={isEditing}
+          nodeId={nodeId}
+          onStartEditing={() => setIsEditing(true)}
+          onStopEditing={() => setIsEditing(false)}
+        />
+      }
+      nodeId={nodeId}
+      onClick={handleClick}
+      onDoubleClick={() => focusTreeNode(nodeId)}
+      onMouseEnter={() => setHoveredId(nodeId)}
+      onMouseLeave={() => setHoveredId(null)}
+      onToggle={() => {}}
+    />
+  )
+})

packages/editor/src/components/ui/sidebar/panels/site-panel/tree-node.tsx

@@ -58,6 +58,7 @@ import { BuildingTreeNode } from './building-tree-node'
 import { CeilingTreeNode } from './ceiling-tree-node'
 import { ColumnTreeNode } from './column-tree-node'
 import { DoorTreeNode } from './door-tree-node'
+import { ElevatorTreeNode } from './elevator-tree-node'
 import { FenceTreeNode } from './fence-tree-node'
 import { ItemTreeNode } from './item-tree-node'
 import { LevelTreeNode } from './level-tree-node'
@@ -89,6 +90,8 @@ export const TreeNode = memo(function TreeNode({ nodeId, depth = 0, isLast }: Tr
       return <CeilingTreeNode depth={depth} isLast={isLast} nodeId={nodeId} />
     case 'column':
       return <ColumnTreeNode depth={depth} isLast={isLast} nodeId={nodeId} />
+    case 'elevator':
+      return <ElevatorTreeNode depth={depth} isLast={isLast} nodeId={nodeId} />
     case 'level':
       return <LevelTreeNode depth={depth} isLast={isLast} nodeId={nodeId as `level_${string}`} />
     case 'slab':

packages/editor/src/hooks/use-contextual-tools.ts

@@ -28,6 +28,7 @@ export function useContextualTools() {
       'slab',
       'ceiling',
       'roof',
+      'elevator',
       'door',
       'window',
     ]

packages/editor/src/hooks/use-keyboard.ts

@@ -134,13 +134,19 @@ export const useKeyboard = ({
         const { buildingId, levelId } = useViewer.getState().selection
         if (buildingId) {
           const building = useScene.getState().nodes[buildingId]
-          if (building && building.type === 'building' && building.children.length > 0) {
-            const currentIdx = levelId ? building.children.indexOf(levelId as any) : -1
-            const nextIdx = currentIdx < building.children.length - 1 ? currentIdx + 1 : currentIdx
+          const levels =
+            building?.type === 'building'
+              ? building.children.filter(
+                  (childId) => useScene.getState().nodes[childId as AnyNodeId]?.type === 'level',
+                )
+              : []
+          if (levels.length > 0) {
+            const currentIdx = levelId ? levels.indexOf(levelId as any) : -1
+            const nextIdx = currentIdx < levels.length - 1 ? currentIdx + 1 : currentIdx
             if (nextIdx !== -1 && nextIdx !== currentIdx) {
-              useViewer.getState().setSelection({ levelId: building.children[nextIdx] as any })
+              useViewer.getState().setSelection({ levelId: levels[nextIdx] as any })
             } else if (currentIdx === -1) {
-              useViewer.getState().setSelection({ levelId: building.children[0] as any })
+              useViewer.getState().setSelection({ levelId: levels[0] as any })
             }
           }
         }
@@ -149,15 +155,19 @@ export const useKeyboard = ({
         const { buildingId, levelId } = useViewer.getState().selection
         if (buildingId) {
           const building = useScene.getState().nodes[buildingId]
-          if (building && building.type === 'building' && building.children.length > 0) {
-            const currentIdx = levelId ? building.children.indexOf(levelId as any) : -1
+          const levels =
+            building?.type === 'building'
+              ? building.children.filter(
+                  (childId) => useScene.getState().nodes[childId as AnyNodeId]?.type === 'level',
+                )
+              : []
+          if (levels.length > 0) {
+            const currentIdx = levelId ? levels.indexOf(levelId as any) : -1
             const prevIdx = currentIdx > 0 ? currentIdx - 1 : currentIdx
             if (prevIdx !== -1 && prevIdx !== currentIdx) {
-              useViewer.getState().setSelection({ levelId: building.children[prevIdx] as any })
+              useViewer.getState().setSelection({ levelId: levels[prevIdx] as any })
             } else if (currentIdx === -1) {
-              useViewer
-                .getState()
-                .setSelection({ levelId: building.children[building.children.length - 1] as any })
+              useViewer.getState().setSelection({ levelId: levels[levels.length - 1] as any })
             }
           }
         }

packages/editor/src/lib/elevator-support.ts

@@ -0,0 +1,96 @@
+import {
+  type AnyNode,
+  type AnyNodeId,
+  type BuildingNode,
+  type ElevatorNode,
+  type LevelNode,
+  spatialGridManager,
+  useScene,
+} from '@pascal-app/core'
+
+function getBuildingLevels(
+  buildingId: string | null | undefined,
+  nodes: Record<string, AnyNode>,
+): LevelNode[] {
+  if (!buildingId) return []
+  const building = nodes[buildingId as AnyNodeId]
+  if (building?.type !== 'building') return []
+
+  return building.children
+    .map((childId) => nodes[childId as AnyNodeId])
+    .filter((entry): entry is LevelNode => entry?.type === 'level')
+    .sort((left, right) => left.level - right.level)
+}
+
+export function resolveCurrentBuildingId({
+  buildingId,
+  levelId,
+  nodes,
+}: {
+  buildingId: BuildingNode['id'] | null
+  levelId: LevelNode['id'] | null
+  nodes: Record<string, AnyNode>
+}): BuildingNode['id'] | null {
+  if (buildingId) return buildingId
+  if (!levelId) return null
+
+  const level = nodes[levelId as AnyNodeId]
+  if (
+    level?.type === 'level' &&
+    level.parentId &&
+    nodes[level.parentId as AnyNodeId]?.type === 'building'
+  ) {
+    return level.parentId as BuildingNode['id']
+  }
+
+  return null
+}
+
+export function resolveElevatorSupportLevelId({
+  buildingId,
+  preferredLevelId,
+}: {
+  buildingId: string | null | undefined
+  preferredLevelId?: string | null
+}): LevelNode['id'] | null {
+  const nodes = useScene.getState().nodes
+  const preferred = preferredLevelId ? nodes[preferredLevelId as AnyNodeId] : undefined
+  const levels = getBuildingLevels(buildingId, nodes)
+  const preferredInBuilding = preferredLevelId
+    ? levels.find((level) => level.id === preferredLevelId)
+    : undefined
+
+  if (preferredInBuilding) return preferredInBuilding.id
+  if (levels.length === 0) return preferred?.type === 'level' ? preferred.id : null
+
+  return levels[0]?.id ?? null
+}
+
+export function resolveElevatorSupportY({
+  buildingId,
+  preferredLevelId,
+  x,
+  z,
+}: {
+  buildingId: string | null | undefined
+  preferredLevelId?: string | null
+  x: number
+  z: number
+}): number {
+  const levelId = resolveElevatorSupportLevelId({ buildingId, preferredLevelId })
+  if (!levelId) return 0
+
+  return Math.max(0, spatialGridManager.getSlabElevationAt(levelId, x, z))
+}
+
+export function resolveElevatorNodeSupportY(
+  node: ElevatorNode,
+  position: [number, number, number] = node.position,
+): number {
+  return resolveElevatorSupportY({
+    buildingId: node.parentId,
+    preferredLevelId: node.fromLevelId ?? node.defaultLevelId,
+    x: position[0],
+    z: position[2],
+  })
+}

packages/editor/src/lib/floorplan/selection-tool.ts

@@ -2,6 +2,7 @@ import type {
   CeilingNode,
   ColumnNode,
   DoorNode,
+  ElevatorNode,
   ItemNode,
   Point2D,
   RoofNode,
@@ -59,6 +60,11 @@ type ColumnEntry = {
   polygon: Point2D[]
 }
 
+type ElevatorEntry = {
+  elevator: ElevatorNode
+  polygon: Point2D[]
+}
+
 type RoofEntry = {
   roof: RoofNode
   segments: Array<{
@@ -78,6 +84,7 @@ type FloorplanSelectionToolContext = {
   slabs: SlabEntry[]
   ceilings: CeilingEntry[]
   columns: ColumnEntry[]
+  elevators: ElevatorEntry[]
   roofs: RoofEntry[]
   openingHitTolerance: number
   wallHitTolerance: number
@@ -130,6 +137,13 @@ export function getFloorplanHitNodeId(context: FloorplanSelectionToolContext) {
       return stairHit.stair.id
     }
 
+    const elevatorHit = context.elevators.find(({ polygon }) =>
+      isPointInsidePolygon(context.point, polygon),
+    )
+    if (elevatorHit) {
+      return elevatorHit.elevator.id
+    }
+
     const columnHit = context.columns.find(({ polygon }) =>
       isPointInsidePolygon(context.point, polygon),
     )
@@ -181,6 +195,7 @@ type FloorplanSelectionBoundsContext = {
   slabs: SlabEntry[]
   ceilings: CeilingEntry[]
   columns: ColumnEntry[]
+  elevators: ElevatorEntry[]
   stairs: StairEntry[]
   roofs: RoofEntry[]
 }
@@ -195,6 +210,7 @@ export function getFloorplanSelectionIdsInBounds({
   slabs,
   ceilings,
   columns,
+  elevators,
   stairs,
   roofs,
 }: FloorplanSelectionBoundsContext) {
@@ -223,6 +239,9 @@ export function getFloorplanSelectionIdsInBounds({
   const columnIds = columns
     .filter(({ polygon }) => doesPolygonIntersectSelectionBounds(polygon, bounds))
     .map(({ column }) => column.id)
+  const elevatorIds = elevators
+    .filter(({ polygon }) => doesPolygonIntersectSelectionBounds(polygon, bounds))
+    .map(({ elevator }) => elevator.id)
   const stairIds = stairs
     .filter((stair) =>
       getStairHitPolygons(stair).some((polygon) =>
@@ -244,6 +263,7 @@ export function getFloorplanSelectionIdsInBounds({
       ...slabIds,
       ...ceilingIds,
       ...columnIds,
+      ...elevatorIds,
       ...stairIds,
       ...roofIds,
     ]),

packages/editor/src/lib/history.ts

@@ -1,6 +1,7 @@
-import { useLiveTransforms, useScene } from '@pascal-app/core'
+import { useLiveNodeOverrides, useLiveTransforms, useScene } from '@pascal-app/core'
 
 function refreshSceneAfterHistoryJump() {
+  useLiveNodeOverrides.getState().clearAll()
   useLiveTransforms.getState().clearAll()
 
   const state = useScene.getState()

packages/editor/src/store/use-editor.tsx

@@ -7,6 +7,7 @@ import {
   type CeilingNode,
   type ColumnNode,
   type DoorNode,
+  type ElevatorNode,
   type FenceNode,
   type ItemNode,
   type LevelNode,
@@ -27,7 +28,6 @@ import {
 import { useViewer } from '@pascal-app/viewer'
 import { create } from 'zustand'
 import { persist } from 'zustand/middleware'
-import { getDefaultCatalogItem } from '../components/ui/item-catalog/catalog-items'
 import {
   type ActivePaintMaterial,
   type PaintableMaterialTarget,
@@ -58,6 +58,7 @@ export type StructureTool =
   | 'ceiling'
   | 'roof'
   | 'column'
+  | 'elevator'
   | 'stair'
   | 'item'
   | 'zone'
@@ -138,6 +139,7 @@ type EditorState = {
     | ItemNode
     | WindowNode
     | DoorNode
+    | ElevatorNode
     | CeilingNode
     | ColumnNode
     | SlabNode
@@ -155,6 +157,7 @@ type EditorState = {
       | ItemNode
       | WindowNode
       | DoorNode
+      | ElevatorNode
       | CeilingNode
       | ColumnNode
       | SlabNode
@@ -453,9 +456,14 @@ export function selectDefaultBuildingAndLevel() {
     })
     if (level0Id) {
       viewer.setSelection({ levelId: level0Id as LevelNode['id'] })
-    } else if (buildingNode.children[0]) {
+    } else {
       // Fallback to first level if level 0 doesn't exist
-      viewer.setSelection({ levelId: buildingNode.children[0] as LevelNode['id'] })
+      const firstLevelId = buildingNode.children.find(
+        (childId) => scene.nodes[childId]?.type === 'level',
+      )
+      if (firstLevelId) {
+        viewer.setSelection({ levelId: firstLevelId as LevelNode['id'] })
+      }
     }
   }
 }
@@ -559,12 +567,15 @@ const useEditor = create<EditorState>()(
         | ItemNode
         | WindowNode
         | DoorNode
+        | ElevatorNode
         | CeilingNode
+        | ColumnNode
         | SlabNode
         | WallNode
         | FenceNode
         | RoofNode
         | RoofSegmentNode
+        | SpawnNode
         | StairNode
         | StairSegmentNode
         | BuildingNode

packages/viewer/src/components/renderers/node-renderer.tsx

@@ -5,6 +5,7 @@ import { BuildingRenderer } from './building/building-renderer'
 import { CeilingRenderer } from './ceiling/ceiling-renderer'
 import { ColumnRenderer } from './column/column-renderer'
 import { DoorRenderer } from './door/door-renderer'
+import { ElevatorRenderer } from './elevator/elevator-renderer'
 import { FenceRenderer } from './fence/fence-renderer'
 import { GuideRenderer } from './guide/guide-renderer'
 import { ItemRenderer } from './item/item-renderer'
@@ -32,6 +33,7 @@ export const NodeRenderer = ({ nodeId }: { nodeId: AnyNode['id'] }) => {
       {node.type === 'building' && <BuildingRenderer node={node} />}
       {node.type === 'ceiling' && <CeilingRenderer node={node} />}
       {node.type === 'column' && <ColumnRenderer node={node} />}
+      {node.type === 'elevator' && <ElevatorRenderer node={node} />}
       {node.type === 'level' && <LevelRenderer node={node} />}
       {node.type === 'item' && <ItemRenderer node={node} />}
       {node.type === 'slab' && <SlabRenderer node={node} />}

packages/viewer/src/components/renderers/site/site-renderer.tsx

@@ -2,6 +2,7 @@ import { useRegistry, useScene, type SiteNode, type SlabNode } from '@pascal-app
 import { useMemo, useRef } from 'react'
 import { BufferGeometry, Float32BufferAttribute, Path, Shape, type Group } from 'three'
 import { useNodeEvents } from '../../../hooks/use-node-events'
+import { unionPolygons } from '../../../lib/polygon-union'
 import useViewer from '../../../store/use-viewer'
 import { NodeRenderer } from '../node-renderer'
 
@@ -87,17 +88,16 @@ export const SiteRenderer = ({ node }: { node: SiteNode }) => {
     for (let i = 1; i < pts.length; i++) shape.lineTo(pts[i]![0], -pts[i]![1])
     shape.closePath()
 
-    for (const polygon of slabPolygons) {
-      if (polygon.length < 3) continue
-
+    if (slabPolygons.length > 0) {
+      for (const ring of unionPolygons(slabPolygons.map((p) => p.map((pt) => [pt[0], -pt[1]])))) {
+        if (ring.length < 3) continue
         const hole = new Path()
-      hole.moveTo(polygon[0]![0], -polygon[0]![1])
-      for (let i = 1; i < polygon.length; i++) {
-        hole.lineTo(polygon[i]![0], -polygon[i]![1])
-      }
+        hole.moveTo(ring[0]![0], ring[0]![1])
+        for (let i = 1; i < ring.length; i++) hole.lineTo(ring[i]![0], ring[i]![1])
         hole.closePath()
         shape.holes.push(hole)
       }
+    }
 
     return shape
   }, [node?.polygon?.points, slabPolygons])

packages/viewer/src/components/viewer/ground-occluder.tsx

@@ -1,6 +1,7 @@
 import { type LevelNode, useScene } from '@pascal-app/core'
 import { useMemo } from 'react'
 import * as THREE from 'three'
+import { unionPolygons } from '../../lib/polygon-union'
 import useViewer from '../../store/use-viewer'
 
 export const GroundOccluder = () => {
@@ -62,17 +63,19 @@ export const GroundOccluder = () => {
       polygons.push(node.polygon as [number, number][])
     })
 
-    for (const polygon of polygons) {
-      if (polygon.length < 3) continue
-
+    if (polygons.length > 0) {
+      for (const ring of unionPolygons(polygons.map((pts) => pts.map((p) => [p[0], -p[1]])))) {
+        if (ring.length < 3) continue
         const hole = new THREE.Path()
-      hole.moveTo(polygon[0]![0], -polygon[0]![1])
-      for (let i = 1; i < polygon.length; i++) {
-        hole.lineTo(polygon[i]![0], -polygon[i]![1])
+
+        hole.moveTo(ring[0]![0], ring[0]![1])
+        for (let i = 1; i < ring.length; i++) {
+          hole.lineTo(ring[i]![0], ring[i]![1])
         }
         hole.closePath()
         s.holes.push(hole)
       }
+    }
 
     return s
   }, [nodes])

packages/viewer/src/components/viewer/index.tsx

@@ -1,6 +1,7 @@
 'use client'
 
-import { Canvas, extend, useFrame, useThree, type ThreeToJSXElements } from '@react-three/fiber'
+import { ElevatorOpeningSystem, ElevatorRuntimeSystem } from '@pascal-app/core'
+import { Canvas, extend, type ThreeToJSXElements, useFrame, useThree } from '@react-three/fiber'
 import { useEffect, useMemo, useRef } from 'react'
 import * as THREE from 'three/webgpu'
 import { PERF_OVERLAY_ENABLED, pushGpuSample } from '../../lib/gpu-perf'
@@ -8,6 +9,7 @@ import useViewer from '../../store/use-viewer'
 import { CeilingSystem } from '../../systems/ceiling/ceiling-system'
 import { DoorAnimationSystem } from '../../systems/door/door-animation-system'
 import { DoorSystem } from '../../systems/door/door-system'
+import { ElevatorInteractionSystem } from '../../systems/elevator/elevator-interaction-system'
 import { FenceSystem } from '../../systems/fence/fence-system'
 import { GuideSystem } from '../../systems/guide/guide-system'
 import { ItemLightSystem } from '../../systems/item-light/item-light-system'
@@ -106,7 +108,7 @@ function GPUDeviceWatcher() {
 
   useEffect(() => {
     const backend = (gl as any).backend
-    const device: GPUDevice | undefined = backend?.device
+    const device = backend?.device as WebGPUDeviceLike | undefined
 
     if (!device) {
       console.warn('[viewer] No WebGPU device on backend — running on a fallback renderer.', {
@@ -121,22 +123,22 @@ function GPUDeviceWatcher() {
       features: Array.from(device.features ?? []),
     })
 
-    device.lost.then((info) => {
+    device.lost.then((info: WebGPUDeviceLossInfo) => {
       console.error(
-        `[viewer] WebGPU device lost: reason="${info.reason}", message="${info.message}". ` +
+        `[viewer] WebGPU device lost: reason="${info.reason ?? 'unknown'}", message="${info.message ?? ''}". ` +
           'The page must be reloaded to recover the GPU context.',
       )
     })
 
     // Uncaptured errors are normally silent (only console-warned by Chrome at
     // best). Pipe them to console.error so silent mobile crashes show up.
-    const onUncapturedError = (event: GPUUncapturedErrorEvent) => {
-      console.error('[viewer] WebGPU uncaptured error:', event.error.message, event.error)
+    const onUncapturedError = (event: any) => {
+      console.error('[viewer] WebGPU uncaptured error:', event?.error?.message, event?.error)
     }
-    device.addEventListener('uncapturederror', onUncapturedError as EventListener)
+    device.addEventListener?.('uncapturederror', onUncapturedError)
 
     return () => {
-      device.removeEventListener('uncapturederror', onUncapturedError as EventListener)
+      device.removeEventListener?.('uncapturederror', onUncapturedError)
     }
   }, [gl])
 
@@ -175,24 +177,12 @@ const Viewer: React.FC<ViewerProps> = ({
           const canvas = props.canvas
           const cached = canvas ? WEBGPU_RENDERER_CACHE.get(canvas) : undefined
           if (cached) return cached
-          // Surface the env we're about to ask WebGPU for — catches "no
-          // navigator.gpu" / "adapter request failed" silently failing in
-          // mobile WebViews where WebGPU is gated behind flags.
-          const hasGpu = typeof navigator !== 'undefined' && 'gpu' in navigator
-          console.log('[viewer] Creating WebGPURenderer', {
-            hasNavigatorGPU: hasGpu,
-            ua: typeof navigator !== 'undefined' ? navigator.userAgent : 'n/a',
-          })
           const promise = (async () => {
             try {
               const renderer = new THREE.WebGPURenderer(props as any)
               renderer.toneMapping = THREE.ACESFilmicToneMapping
               renderer.toneMappingExposure = 0.9
               await renderer.init()
-              console.log('[viewer] WebGPURenderer ready', {
-                backend: (renderer as any).backend?.constructor?.name,
-                isWebGPU: (renderer as any).isWebGPURenderer === true,
-              })
               return renderer
             } catch (err) {
               // Drop the failed promise from the cache so a future Canvas
@@ -240,6 +230,9 @@ const Viewer: React.FC<ViewerProps> = ({
         {/* Core systems */}
         <CeilingSystem />
         <DoorAnimationSystem />
+        <ElevatorRuntimeSystem />
+        <ElevatorInteractionSystem />
+        <ElevatorOpeningSystem />
         <WindowAnimationSystem />
         <DoorSystem />
         <FenceSystem />

packages/viewer/src/components/viewer/post-processing.tsx

@@ -154,6 +154,7 @@ const PostProcessingPasses = ({
 
   // Subscribe to projectId so the pipeline rebuilds on project switch
   const projectId = useViewer((s) => s.projectId)
+  const lastProjectIdRef = useRef(projectId)
 
   // Bump this to force a pipeline rebuild (used by retry logic)
   const [pipelineVersion, setPipelineVersion] = useState(0)
@@ -169,6 +170,8 @@ const PostProcessingPasses = ({
 
   // Reset retry state when project changes
   useEffect(() => {
+    if (lastProjectIdRef.current === projectId) return
+    lastProjectIdRef.current = projectId
     retryCountRef.current = 0
     if (rebuildTimeoutRef.current !== null) {
       clearTimeout(rebuildTimeoutRef.current)
@@ -231,6 +234,21 @@ const PostProcessingPasses = ({
 
     hasPipelineErrorRef.current = false
 
+    // WebGPU availability check: SSGI, denoise, and RenderPipeline are all
+    // WebGPU-only APIs. When the browser falls back to WebGL2 (no
+    // `navigator.gpu`, or the device couldn't be created), building the
+    // pipeline either throws silently or produces a broken output where
+    // the scene renders for a few frames and then goes black as the retry
+    // loop fights the direct-render fallback path. Short-circuit here so
+    // `useFrame` uses the direct `renderer.render(scene, camera)` path
+    // exclusively and never attempts the TSL pipeline.
+    const hasWebGPU = typeof navigator !== 'undefined' && 'gpu' in navigator
+    if (!hasWebGPU) {
+      hasPipelineErrorRef.current = true
+      renderPipelineRef.current = null
+      return
+    }
+
     // Clear outliner arrays synchronously to prevent stale Object3D refs
     // from the previous project leaking into the new pipeline's outline passes.
     const outliner = useViewer.getState().outliner
@@ -361,7 +379,6 @@ const PostProcessingPasses = ({
       renderPipeline.outputNode = finalOutput
       renderPipelineRef.current = renderPipeline
       retryCountRef.current = 0
-      console.log('[viewer/post-processing] Pipeline built OK', { version: pipelineVersion })
     } catch (error) {
       hasPipelineErrorRef.current = true
       console.error(
@@ -388,6 +405,7 @@ const PostProcessingPasses = ({
   }, [
     camera,
     hoverHiddenColor,
+    hoverHighlightMode,
     hoverPulseMix,
     hoverStrength,
     hoverVisibleColor,
@@ -463,9 +481,6 @@ const PostProcessingPasses = ({
       if (retryCountRef.current < MAX_PIPELINE_RETRIES) {
         // Auto-retry: schedule a pipeline rebuild if we haven't exceeded the retry limit
         retryCountRef.current++
-        console.warn(
-          `[viewer/post-processing] Scheduling pipeline rebuild (attempt ${retryCountRef.current}/${MAX_PIPELINE_RETRIES})`,
-        )
         if (rebuildTimeoutRef.current !== null) {
           clearTimeout(rebuildTimeoutRef.current)
         }

packages/viewer/src/hooks/use-node-events.ts

@@ -7,6 +7,8 @@ import {
   type ColumnNode,
   type DoorEvent,
   type DoorNode,
+  type ElevatorEvent,
+  type ElevatorNode,
   type EventSuffix,
   emitter,
   type FenceEvent,
@@ -57,6 +59,7 @@ type NodeConfig = {
   'stair-segment': { node: StairSegmentNode; event: StairSegmentEvent }
   window: { node: WindowNode; event: WindowEvent }
   door: { node: DoorNode; event: DoorEvent }
+  elevator: { node: ElevatorNode; event: ElevatorEvent }
 }
 
 type NodeType = keyof NodeConfig

packages/viewer/src/lib/polygon-union.test.ts

@@ -0,0 +1,77 @@
+// @ts-expect-error — bun:test is provided by the Bun runtime; viewer does not
+// depend on @types/bun so the import type is unresolved at compile time.
+import { describe, expect, test } from 'bun:test'
+import { type Point2D, unionPolygons } from './polygon-union'
+
+function polygonArea(points: Point2D[]) {
+  let area = 0
+  for (let i = 0; i < points.length; i++) {
+    const current = points[i]!
+    const next = points[(i + 1) % points.length]!
+    area += current[0] * next[1] - next[0] * current[1]
+  }
+  return Math.abs(area / 2)
+}
+
+describe('unionPolygons', () => {
+  test('collapses a contained polygon into the containing polygon', () => {
+    const small: Point2D[] = [
+      [0, 0],
+      [1, 0],
+      [1, 1],
+      [0, 1],
+    ]
+    const large: Point2D[] = [
+      [-1, -1],
+      [2, -1],
+      [2, 2],
+      [-1, 2],
+    ]
+
+    const result = unionPolygons([small, large])
+
+    expect(result).toHaveLength(1)
+    expect(polygonArea(result[0]!)).toBeCloseTo(9)
+  })
+
+  test('combines overlapping rectangles into one boundary', () => {
+    const left: Point2D[] = [
+      [0, 0],
+      [2, 0],
+      [2, 2],
+      [0, 2],
+    ]
+    const right: Point2D[] = [
+      [1, 1],
+      [3, 1],
+      [3, 3],
+      [1, 3],
+    ]
+
+    const result = unionPolygons([left, right])
+
+    expect(result).toHaveLength(1)
+    expect(result[0]).toHaveLength(8)
+    expect(polygonArea(result[0]!)).toBeCloseTo(7)
+  })
+
+  test('keeps disjoint polygons as separate boundaries', () => {
+    const left: Point2D[] = [
+      [0, 0],
+      [1, 0],
+      [1, 1],
+      [0, 1],
+    ]
+    const right: Point2D[] = [
+      [2, 0],
+      [3, 0],
+      [3, 1],
+      [2, 1],
+    ]
+
+    const result = unionPolygons([left, right])
+
+    expect(result).toHaveLength(2)
+    expect(result.map(polygonArea)).toEqual([1, 1])
+  })
+})

packages/viewer/src/lib/polygon-union.ts

@@ -0,0 +1,294 @@
+export type Point2D = [number, number]
+
+const EPSILON = 1e-7
+const KEY_SCALE = 1e6
+
+type Edge = {
+  start: Point2D
+  end: Point2D
+  polygonIndex: number
+  splits: number[]
+}
+
+type Segment = {
+  start: Point2D
+  end: Point2D
+  used: boolean
+}
+
+function pointsEqual(a: Point2D, b: Point2D, tolerance = EPSILON) {
+  return Math.hypot(a[0] - b[0], a[1] - b[1]) <= tolerance
+}
+
+function pointKey(point: Point2D) {
+  return `${Math.round(point[0] * KEY_SCALE)}:${Math.round(point[1] * KEY_SCALE)}`
+}
+
+function interpolate(a: Point2D, b: Point2D, t: number): Point2D {
+  return [a[0] + (b[0] - a[0]) * t, a[1] + (b[1] - a[1]) * t]
+}
+
+function cross(ax: number, ay: number, bx: number, by: number) {
+  return ax * by - ay * bx
+}
+
+function polygonArea(points: Point2D[]) {
+  let area = 0
+  for (let i = 0; i < points.length; i++) {
+    const current = points[i]!
+    const next = points[(i + 1) % points.length]!
+    area += current[0] * next[1] - next[0] * current[1]
+  }
+  return area / 2
+}
+
+function pointOnSegment(point: Point2D, start: Point2D, end: Point2D) {
+  const dx = end[0] - start[0]
+  const dz = end[1] - start[1]
+  const crossValue = cross(point[0] - start[0], point[1] - start[1], dx, dz)
+  if (Math.abs(crossValue) > EPSILON) return false
+
+  const dot =
+    (point[0] - start[0]) * (point[0] - end[0]) + (point[1] - start[1]) * (point[1] - end[1])
+  return dot <= EPSILON
+}
+
+function pointInPolygon(point: Point2D, polygon: Point2D[]) {
+  let inside = false
+
+  for (let i = 0, j = polygon.length - 1; i < polygon.length; j = i++) {
+    const pi = polygon[i]!
+    const pj = polygon[j]!
+
+    if (pointOnSegment(point, pj, pi)) return false
+
+    const intersects =
+      pi[1] > point[1] !== pj[1] > point[1] &&
+      point[0] < ((pj[0] - pi[0]) * (point[1] - pi[1])) / (pj[1] - pi[1]) + pi[0]
+
+    if (intersects) inside = !inside
+  }
+
+  return inside
+}
+
+function normalizeRing(ring: Point2D[]) {
+  const normalized: Point2D[] = []
+
+  for (const [x, z] of ring) {
+    if (!Number.isFinite(x) || !Number.isFinite(z)) continue
+
+    const point: Point2D = [x, z]
+    const previous = normalized[normalized.length - 1]
+    if (!previous || !pointsEqual(previous, point)) {
+      normalized.push(point)
+    }
+  }
+
+  const first = normalized[0]
+  const last = normalized[normalized.length - 1]
+  if (first && last && pointsEqual(first, last)) {
+    normalized.pop()
+  }
+
+  if (normalized.length < 3 || Math.abs(polygonArea(normalized)) <= EPSILON) return []
+  return polygonArea(normalized) < 0 ? [...normalized].reverse() : normalized
+}
+
+function addSplit(edge: Edge, t: number) {
+  if (t < -EPSILON || t > 1 + EPSILON) return
+  const clamped = Math.max(0, Math.min(1, t))
+  if (edge.splits.some((split) => Math.abs(split - clamped) <= EPSILON)) return
+  edge.splits.push(clamped)
+}
+
+function parameterOnEdge(point: Point2D, edge: Edge) {
+  const dx = edge.end[0] - edge.start[0]
+  const dz = edge.end[1] - edge.start[1]
+  const lengthSquared = dx * dx + dz * dz
+  if (lengthSquared <= EPSILON) return 0
+  return ((point[0] - edge.start[0]) * dx + (point[1] - edge.start[1]) * dz) / lengthSquared
+}
+
+function addIntersectionSplits(left: Edge, right: Edge) {
+  const rx = left.end[0] - left.start[0]
+  const rz = left.end[1] - left.start[1]
+  const sx = right.end[0] - right.start[0]
+  const sz = right.end[1] - right.start[1]
+  const qpx = right.start[0] - left.start[0]
+  const qpz = right.start[1] - left.start[1]
+  const denominator = cross(rx, rz, sx, sz)
+  const numerator = cross(qpx, qpz, rx, rz)
+
+  if (Math.abs(denominator) <= EPSILON) {
+    if (Math.abs(numerator) > EPSILON) return
+
+    for (const point of [left.start, left.end, right.start, right.end]) {
+      if (
+        pointOnSegment(point, left.start, left.end) &&
+        pointOnSegment(point, right.start, right.end)
+      ) {
+        addSplit(left, parameterOnEdge(point, left))
+        addSplit(right, parameterOnEdge(point, right))
+      }
+    }
+    return
+  }
+
+  const t = cross(qpx, qpz, sx, sz) / denominator
+  const u = cross(qpx, qpz, rx, rz) / denominator
+  if (t < -EPSILON || t > 1 + EPSILON || u < -EPSILON || u > 1 + EPSILON) return
+
+  addSplit(left, t)
+  addSplit(right, u)
+}
+
+function buildEdges(polygons: Point2D[][]) {
+  const edges: Edge[] = []
+
+  polygons.forEach((polygon, polygonIndex) => {
+    for (let i = 0; i < polygon.length; i++) {
+      edges.push({
+        start: polygon[i]!,
+        end: polygon[(i + 1) % polygon.length]!,
+        polygonIndex,
+        splits: [0, 1],
+      })
+    }
+  })
+
+  for (let i = 0; i < edges.length; i++) {
+    for (let j = i + 1; j < edges.length; j++) {
+      const left = edges[i]!
+      const right = edges[j]!
+      if (left.polygonIndex === right.polygonIndex) continue
+      addIntersectionSplits(left, right)
+    }
+  }
+
+  return edges
+}
+
+function buildBoundarySegments(edges: Edge[], polygons: Point2D[][]) {
+  const segments: Segment[] = []
+
+  for (const edge of edges) {
+    const splits = [...edge.splits].sort((a, b) => a - b)
+
+    for (let i = 0; i < splits.length - 1; i++) {
+      const startT = splits[i]!
+      const endT = splits[i + 1]!
+      if (endT - startT <= EPSILON) continue
+
+      const start = interpolate(edge.start, edge.end, startT)
+      const end = interpolate(edge.start, edge.end, endT)
+      const mid = interpolate(edge.start, edge.end, (startT + endT) / 2)
+      const insideAnother = polygons.some(
+        (polygon, index) => index !== edge.polygonIndex && pointInPolygon(mid, polygon),
+      )
+
+      if (!insideAnother) {
+        segments.push({ start, end, used: false })
+      }
+    }
+  }
+
+  return removeDuplicateInteriorSegments(segments)
+}
+
+function segmentKey(segment: Segment) {
+  const start = pointKey(segment.start)
+  const end = pointKey(segment.end)
+  return start < end ? `${start}|${end}` : `${end}|${start}`
+}
+
+function removeDuplicateInteriorSegments(segments: Segment[]) {
+  const groups = new Map<string, Segment[]>()
+  for (const segment of segments) {
+    const key = segmentKey(segment)
+    const group = groups.get(key)
+    if (group) {
+      group.push(segment)
+    } else {
+      groups.set(key, [segment])
+    }
+  }
+
+  const result: Segment[] = []
+  for (const group of groups.values()) {
+    if (group.length === 1) {
+      result.push(group[0]!)
+      continue
+    }
+
+    const firstStart = pointKey(group[0]!.start)
+    const firstEnd = pointKey(group[0]!.end)
+    const hasOppositeDirection = group.some(
+      (segment) => pointKey(segment.start) === firstEnd && pointKey(segment.end) === firstStart,
+    )
+
+    if (!hasOppositeDirection) {
+      result.push(group[0]!)
+    }
+  }
+
+  return result
+}
+
+function assembleRings(segments: Segment[]) {
+  const byStart = new Map<string, Segment[]>()
+  for (const segment of segments) {
+    const key = pointKey(segment.start)
+    const group = byStart.get(key)
+    if (group) {
+      group.push(segment)
+    } else {
+      byStart.set(key, [segment])
+    }
+  }
+
+  const rings: Point2D[][] = []
+
+  for (const firstSegment of segments) {
+    if (firstSegment.used) continue
+
+    firstSegment.used = true
+    const ring: Point2D[] = [firstSegment.start, firstSegment.end]
+    const startKey = pointKey(firstSegment.start)
+    let currentKey = pointKey(firstSegment.end)
+
+    while (currentKey !== startKey) {
+      const next = byStart.get(currentKey)?.find((segment) => !segment.used)
+      if (!next) break
+
+      next.used = true
+      ring.push(next.end)
+      currentKey = pointKey(next.end)
+    }
+
+    if (currentKey !== startKey) continue
+
+    const last = ring[ring.length - 1]
+    if (last && pointsEqual(ring[0]!, last)) {
+      ring.pop()
+    }
+
+    const normalized = normalizeRing(ring)
+    if (normalized.length >= 3) {
+      rings.push(normalized)
+    }
+  }
+
+  return rings
+}
+
+export function unionPolygons(polygons: Point2D[][]): Point2D[][] {
+  const validPolygons = polygons.map(normalizeRing).filter((polygon) => polygon.length >= 3)
+  if (validPolygons.length <= 1) return validPolygons
+
+  const edges = buildEdges(validPolygons)
+  const segments = buildBoundarySegments(edges, validPolygons)
+  const rings = assembleRings(segments)
+
+  return rings.length > 0 ? rings : validPolygons
+}

packages/viewer/src/systems/ceiling/ceiling-system.tsx

@@ -1,6 +1,7 @@
 import { type AnyNodeId, type CeilingNode, sceneRegistry, useScene } from '@pascal-app/core'
 import { useFrame } from '@react-three/fiber'
 import * as THREE from 'three'
+import { mergeSurfaceHolePolygons } from '../surface-hole-geometry'
 
 function ensureUv2Attribute(geometry: THREE.BufferGeometry) {
   const uv = geometry.getAttribute('uv')
@@ -82,7 +83,7 @@ export function generateCeilingGeometry(ceilingNode: CeilingNode): THREE.BufferG
   shape.closePath()
 
   // Add holes to the shape
-  const holes = ceilingNode.holes || []
+  const holes = mergeSurfaceHolePolygons(ceilingNode.holes || [])
   for (const holePolygon of holes) {
     if (holePolygon.length < 3) continue
 

packages/viewer/src/systems/elevator/elevator-interaction-system.tsx

@@ -0,0 +1,93 @@
+import {
+  type AnyNodeId,
+  openElevatorDoor,
+  resolveElevatorDispatchTarget,
+  requestElevatorLevel,
+  useInteractive,
+  useScene,
+} from '@pascal-app/core'
+import { useThree } from '@react-three/fiber'
+import { useEffect, useRef } from 'react'
+import { type Object3D, Raycaster, Vector2 } from 'three'
+
+type ElevatorButtonAction = 'open-door' | 'request-level'
+
+type ElevatorButtonUserData = {
+  action: ElevatorButtonAction
+  disabled: boolean
+  elevatorId: AnyNodeId
+  kind: 'cab' | 'landing'
+  levelId?: AnyNodeId
+}
+
+function getElevatorButtonData(object: Object3D): ElevatorButtonUserData | null {
+  let current: Object3D | null = object
+
+  while (current) {
+    const data = (current.userData as { elevatorButton?: ElevatorButtonUserData }).elevatorButton
+    if (data) return data
+    current = current.parent
+  }
+
+  return null
+}
+
+export function ElevatorInteractionSystem() {
+  const camera = useThree((state) => state.camera)
+  const gl = useThree((state) => state.gl)
+  const scene = useThree((state) => state.scene)
+  const raycasterRef = useRef(new Raycaster())
+  const pointerRef = useRef(new Vector2())
+
+  useEffect(() => {
+    const canvas = gl.domElement
+
+    const handlePointerDown = (event: PointerEvent) => {
+      if (event.button !== 0) return
+
+      const rect = canvas.getBoundingClientRect()
+      const pointer = pointerRef.current
+      pointer.x = ((event.clientX - rect.left) / rect.width) * 2 - 1
+      pointer.y = -((event.clientY - rect.top) / rect.height) * 2 + 1
+
+      const raycaster = raycasterRef.current
+      raycaster.setFromCamera(pointer, camera)
+
+      const button = raycaster
+        .intersectObjects(scene.children, true)
+        .map((intersection) => getElevatorButtonData(intersection.object))
+        .find((data): data is ElevatorButtonUserData => data !== null)
+
+      if (!button || button.disabled) return
+
+      event.preventDefault()
+      event.stopPropagation()
+
+      if (button.action === 'open-door') {
+        openElevatorDoor(button.elevatorId)
+        return
+      }
+
+      if (!button.levelId) return
+
+      const targetElevatorId =
+        button.kind === 'landing'
+          ? resolveElevatorDispatchTarget({
+              elevators: useInteractive.getState().elevators,
+              levelId: button.levelId,
+              nodes: useScene.getState().nodes,
+              requestedElevatorId: button.elevatorId,
+            })
+          : button.elevatorId
+
+      requestElevatorLevel(targetElevatorId, button.levelId)
+    }
+
+    canvas.addEventListener('pointerdown', handlePointerDown, true)
+    return () => {
+      canvas.removeEventListener('pointerdown', handlePointerDown, true)
+    }
+  }, [camera, gl, scene])
+
+  return null
+}

packages/viewer/src/systems/slab/slab-system.tsx

@@ -8,6 +8,7 @@ import {
 import { useFrame } from '@react-three/fiber'
 import { useEffect } from 'react'
 import * as THREE from 'three'
+import { mergeSurfaceHolePolygons } from '../surface-hole-geometry'
 
 function ensureUv2Attribute(geometry: THREE.BufferGeometry) {
   const uv = geometry.getAttribute('uv')
@@ -86,6 +87,7 @@ export function generateSlabGeometry(slabNode: SlabNode): THREE.BufferGeometry {
 function generatePositiveSlabGeometry(slabNode: SlabNode): THREE.BufferGeometry {
   const polygon = getRenderableSlabPolygon(slabNode)
   const elevation = slabNode.elevation ?? 0.05
+  const holePolygons = mergeSurfaceHolePolygons(slabNode.holes ?? [])
 
   if (polygon.length < 3) return new THREE.BufferGeometry()
 
@@ -94,7 +96,7 @@ function generatePositiveSlabGeometry(slabNode: SlabNode): THREE.BufferGeometry
   for (let i = 1; i < polygon.length; i++) shape.lineTo(polygon[i]![0], -polygon[i]![1])
   shape.closePath()
 
-  for (const holePolygon of slabNode.holes ?? []) {
+  for (const holePolygon of holePolygons) {
     if (holePolygon.length < 3) continue
     const holePath = new THREE.Path()
     holePath.moveTo(holePolygon[0]![0], -holePolygon[0]![1])
@@ -122,6 +124,7 @@ function generatePositiveSlabGeometry(slabNode: SlabNode): THREE.BufferGeometry
 function generatePoolGeometry(slabNode: SlabNode): THREE.BufferGeometry {
   const polygon = getRenderableSlabPolygon(slabNode)
   const depth = Math.abs(slabNode.elevation ?? 0.05)
+  const holePolygons = mergeSurfaceHolePolygons(slabNode.holes ?? [])
 
   if (polygon.length < 3) return new THREE.BufferGeometry()
 
@@ -134,7 +137,7 @@ function generatePoolGeometry(slabNode: SlabNode): THREE.BufferGeometry {
   for (const [x, z] of polygon) {
     bounds.expandByPoint(new THREE.Vector2(x, z))
   }
-  for (const hole of slabNode.holes ?? []) {
+  for (const hole of holePolygons) {
     for (const [x, z] of hole) {
       bounds.expandByPoint(new THREE.Vector2(x, z))
     }
@@ -157,8 +160,8 @@ function generatePoolGeometry(slabNode: SlabNode): THREE.BufferGeometry {
   for (const [x, z] of polygon) pushFloorVertex(x!, 0, z!)
 
   const pts2d = polygon.map(([x, z]) => new THREE.Vector2(x!, z!))
-  const holesPts2d = (slabNode.holes ?? []).map((h) => h.map(([x, z]) => new THREE.Vector2(x!, z!)))
-  for (const hole of slabNode.holes ?? []) {
+  const holesPts2d = holePolygons.map((h) => h.map(([x, z]) => new THREE.Vector2(x!, z!)))
+  for (const hole of holePolygons) {
     for (const [x, z] of hole) pushFloorVertex(x!, 0, z!)
   }
 

packages/viewer/src/systems/surface-hole-geometry.ts

@@ -0,0 +1,5 @@
+import { type Point2D, unionPolygons } from '../lib/polygon-union'
+
+export function mergeSurfaceHolePolygons(holes: Point2D[][]): Point2D[][] {
+  return unionPolygons(holes)
+}