From 0514363136b0797a431ed56fd953eef13bb23c1f Mon Sep 17 00:00:00 2001
From: sudhir <sudhir9297@gmail.com>
Date: Fri, 8 May 2026 14:31:58 +0530
Subject: [PATCH] Add column hit testing and align column defaults

---
 packages/core/src/schema/nodes/column.ts      |  32 +--
 .../src/components/editor/floorplan-panel.tsx |  29 ++
 .../editor/use-floorplan-hit-testing.ts       |  12 +
 .../components/tools/column/column-tool.tsx   |   5 +-
 .../components/tools/fence/fence-drafting.ts  |  59 ++--
 .../tools/fence/move-fence-endpoint-tool.tsx  |  60 ++--
 .../tools/select/box-select-tool.tsx          |  15 +
 .../components/ui/floating-level-selector.tsx |  42 ++-
 packages/editor/src/hooks/use-keyboard.ts     |  15 +
 .../src/lib/floorplan/selection-tool.ts       |  20 ++
 packages/editor/src/lib/scene-clipboard.ts    | 267 ++++++++++++++++++
 .../renderers/column/column-renderer.tsx      |  44 ++-
 .../viewer/src/systems/slab/slab-system.tsx   |  15 +-
 13 files changed, 532 insertions(+), 83 deletions(-)
 create mode 100644 packages/editor/src/lib/scene-clipboard.ts

diff --git a/packages/core/src/schema/nodes/column.ts b/packages/core/src/schema/nodes/column.ts
index 0e19a8d6..78a52126 100644
--- a/packages/core/src/schema/nodes/column.ts
+++ b/packages/core/src/schema/nodes/column.ts
@@ -88,7 +88,7 @@ export const ColumnNode = BaseNode.extend({
   rotation: z.number().default(0),
   style: ColumnStyle.default('plain'),
   crossSection: ColumnCrossSection.default('round'),
-  height: z.number().positive().default(2.8),
+  height: z.number().positive().default(2.5),
   radius: z.number().positive().default(0.22),
   width: z.number().positive().default(0.44),
   depth: z.number().positive().default(0.44),
@@ -179,7 +179,7 @@ export const COLUMN_PRESETS = {
     label: 'Straight Round',
     style: 'plain',
     crossSection: 'round',
-    height: 2.9,
+    height: 2.5,
     radius: 0.22,
     width: 0.44,
     depth: 0.44,
@@ -229,7 +229,7 @@ export const COLUMN_PRESETS = {
     label: 'Square Block',
     style: 'faceted',
     crossSection: 'square',
-    height: 2.9,
+    height: 2.5,
     radius: 0.24,
     width: 0.48,
     depth: 0.48,
@@ -279,7 +279,7 @@ export const COLUMN_PRESETS = {
     label: 'Tapered Round',
     style: 'plain',
     crossSection: 'round',
-    height: 3,
+    height: 2.5,
     radius: 0.23,
     width: 0.46,
     depth: 0.46,
@@ -329,7 +329,7 @@ export const COLUMN_PRESETS = {
     label: 'Soft Bulged',
     style: 'plain',
     crossSection: 'round',
-    height: 2.9,
+    height: 2.5,
     radius: 0.22,
     width: 0.44,
     depth: 0.44,
@@ -379,7 +379,7 @@ export const COLUMN_PRESETS = {
     label: 'Hourglass',
     style: 'plain',
     crossSection: 'round',
-    height: 2.9,
+    height: 2.5,
     radius: 0.22,
     width: 0.44,
     depth: 0.44,
@@ -430,7 +430,7 @@ export const COLUMN_PRESETS = {
     supportStyle: 'a-frame',
     style: 'faceted',
     crossSection: 'rectangular',
-    height: 2.6,
+    height: 2.5,
     radius: 0.08,
     width: 0.16,
     depth: 0.16,
@@ -486,7 +486,7 @@ export const COLUMN_PRESETS = {
     supportStyle: 'y-frame',
     style: 'faceted',
     crossSection: 'rectangular',
-    height: 2.7,
+    height: 2.5,
     radius: 0.08,
     width: 0.16,
     depth: 0.16,
@@ -542,7 +542,7 @@ export const COLUMN_PRESETS = {
     supportStyle: 'v-frame',
     style: 'faceted',
     crossSection: 'rectangular',
-    height: 2.6,
+    height: 2.5,
     radius: 0.08,
     width: 0.16,
     depth: 0.16,
@@ -598,7 +598,7 @@ export const COLUMN_PRESETS = {
     supportStyle: 'x-brace',
     style: 'faceted',
     crossSection: 'rectangular',
-    height: 2.6,
+    height: 2.5,
     radius: 0.07,
     width: 0.14,
     depth: 0.14,
@@ -654,7 +654,7 @@ export const COLUMN_PRESETS = {
     supportStyle: 'k-brace',
     style: 'faceted',
     crossSection: 'rectangular',
-    height: 2.6,
+    height: 2.5,
     radius: 0.07,
     width: 0.14,
     depth: 0.14,
@@ -710,7 +710,7 @@ export const COLUMN_PRESETS = {
     supportStyle: 'single-strut',
     style: 'faceted',
     crossSection: 'rectangular',
-    height: 2.6,
+    height: 2.5,
     radius: 0.07,
     width: 0.14,
     depth: 0.14,
@@ -766,7 +766,7 @@ export const COLUMN_PRESETS = {
     supportStyle: 'tripod',
     style: 'faceted',
     crossSection: 'rectangular',
-    height: 2.6,
+    height: 2.5,
     radius: 0.07,
     width: 0.14,
     depth: 0.14,
@@ -822,7 +822,7 @@ export const COLUMN_PRESETS = {
     supportStyle: 'trestle',
     style: 'faceted',
     crossSection: 'rectangular',
-    height: 2.6,
+    height: 2.5,
     radius: 0.07,
     width: 0.14,
     depth: 0.14,
@@ -878,7 +878,7 @@ export const COLUMN_PRESETS = {
     supportStyle: 'portal-frame',
     style: 'faceted',
     crossSection: 'rectangular',
-    height: 2.6,
+    height: 2.5,
     radius: 0.08,
     width: 0.16,
     depth: 0.16,
@@ -934,7 +934,7 @@ export const COLUMN_PRESETS = {
     supportStyle: 'box-frame',
     style: 'faceted',
     crossSection: 'rectangular',
-    height: 2.6,
+    height: 2.5,
     radius: 0.07,
     width: 0.14,
     depth: 0.14,
diff --git a/packages/editor/src/components/editor/floorplan-panel.tsx b/packages/editor/src/components/editor/floorplan-panel.tsx
index b74e4515..aa44ad6a 100644
--- a/packages/editor/src/components/editor/floorplan-panel.tsx
+++ b/packages/editor/src/components/editor/floorplan-panel.tsx
@@ -625,6 +625,12 @@ type FloorplanSpawnEntry = {
   rotation: number
 }
 
+type FloorplanColumnEntry = {
+  column: ColumnNode
+  points: string
+  polygon: Point2D[]
+}
+
 type ReferenceFloorData = {
   ceilingPolygons: CeilingPolygonEntry[]
   columnEntries: ReferenceFloorColumnEntry[]
@@ -8189,6 +8195,28 @@ export function FloorplanPanel() {
         : entry,
     )
   }, [zoneBoundaryDraft, zonePolygons])
+  const floorplanColumnEntries = useMemo<FloorplanColumnEntry[]>(
+    () =>
+      levelDescendantNodes.flatMap((node) => {
+        if (!(node.type === 'column' && node.visible !== false)) {
+          return []
+        }
+
+        const polygon = getColumnPlanFootprint(node)
+        if (polygon.length < 3) {
+          return []
+        }
+
+        return [
+          {
+            column: node,
+            points: formatPolygonPoints(polygon),
+            polygon,
+          },
+        ]
+      }),
+    [levelDescendantNodes],
+  )
   const levelDescendantNodeById = useMemo(
     () => new Map(levelDescendantNodes.map((node) => [node.id, node] as const)),
     [levelDescendantNodes],
@@ -13016,6 +13044,7 @@ export function FloorplanPanel() {
   )
   const { getFloorplanHitIdAtPoint, getFloorplanSelectionIdsInBounds } = useFloorplanHitTesting({
     ceilingPolygons: displayCeilingPolygons,
+    columnPolygons: floorplanColumnEntries,
     displaySlabPolygons,
     displayWallPolygons,
     floorplanItemEntries,
diff --git a/packages/editor/src/components/editor/use-floorplan-hit-testing.ts b/packages/editor/src/components/editor/use-floorplan-hit-testing.ts
index 39722305..09bc830c 100644
--- a/packages/editor/src/components/editor/use-floorplan-hit-testing.ts
+++ b/packages/editor/src/components/editor/use-floorplan-hit-testing.ts
@@ -3,6 +3,7 @@
 import type {
   AnyNode,
   CeilingNode,
+  ColumnNode,
   DoorNode,
   ItemNode,
   Point2D,
@@ -46,6 +47,11 @@ type CeilingPolygonEntry = {
   holes: Point2D[][]
 }
 
+type ColumnPolygonEntry = {
+  column: ColumnNode
+  polygon: Point2D[]
+}
+
 type FloorplanRoofEntry = {
   roof: RoofNode
   segments: Array<{
@@ -72,6 +78,7 @@ type FloorplanStairEntry = {
 
 type UseFloorplanHitTestingArgs = {
   ceilingPolygons: CeilingPolygonEntry[]
+  columnPolygons: ColumnPolygonEntry[]
   displaySlabPolygons: SlabPolygonEntry[]
   displayWallPolygons: WallPolygonEntry[]
   floorplanItemEntries: FloorplanItemEntry[]
@@ -88,6 +95,7 @@ type UseFloorplanHitTestingArgs = {
 
 export function useFloorplanHitTesting({
   ceilingPolygons,
+  columnPolygons,
   displaySlabPolygons,
   displayWallPolygons,
   floorplanItemEntries,
@@ -117,11 +125,13 @@ export function useFloorplanHitTesting({
         slabs: displaySlabPolygons,
         openingHitTolerance: floorplanOpeningHitTolerance,
         wallHitTolerance: floorplanWallHitTolerance,
+        columns: columnPolygons,
         getOpeningCenterLine,
       })
     },
     [
       ceilingPolygons,
+      columnPolygons,
       displaySlabPolygons,
       displayWallPolygons,
       floorplanItemEntries,
@@ -149,10 +159,12 @@ export function useFloorplanHitTesting({
         openings: openingsPolygons,
         roofs: floorplanRoofEntries,
         slabs: displaySlabPolygons,
+        columns: columnPolygons,
         stairs: floorplanStairEntries,
       }),
     [
       ceilingPolygons,
+      columnPolygons,
       displaySlabPolygons,
       displayWallPolygons,
       floorplanItemEntries,
diff --git a/packages/editor/src/components/tools/column/column-tool.tsx b/packages/editor/src/components/tools/column/column-tool.tsx
index e9593d1a..837b1729 100644
--- a/packages/editor/src/components/tools/column/column-tool.tsx
+++ b/packages/editor/src/components/tools/column/column-tool.tsx
@@ -13,7 +13,6 @@ import {
 import { useEffect, useRef, useState } from 'react'
 import type { Group } from 'three'
 import { sfxEmitter } from '../../../lib/sfx-bus'
-import useEditor from '../../../store/use-editor'
 import { CursorSphere } from '../shared/cursor-sphere'
 
 const COLUMN_ICON = (
@@ -70,8 +69,6 @@ export const ColumnTool: React.FC<ColumnToolProps> = ({ currentLevelId, onPlaced
       useScene.getState().createNode(column, currentLevelId)
       onPlaced?.(column.id)
       sfxEmitter.emit('sfx:structure-build')
-      useEditor.getState().setTool(null)
-      useEditor.getState().setMode('select')
     }
 
     emitter.on('grid:move', onGridMove)
@@ -88,7 +85,7 @@ export const ColumnTool: React.FC<ColumnToolProps> = ({ currentLevelId, onPlaced
   return (
     <CursorSphere
       color="#a78bfa"
-      height={2.8}
+      height={2.5}
       ref={cursorRef}
       showTooltip
       tooltipContent={COLUMN_ICON}
diff --git a/packages/editor/src/components/tools/fence/fence-drafting.ts b/packages/editor/src/components/tools/fence/fence-drafting.ts
index 4f1fbd8f..d3af19f8 100644
--- a/packages/editor/src/components/tools/fence/fence-drafting.ts
+++ b/packages/editor/src/components/tools/fence/fence-drafting.ts
@@ -20,6 +20,9 @@ import {
 
 export type FencePlanPoint = WallPlanPoint
 
+const FENCE_CORNER_SNAP_RADIUS = 0.28
+const FENCE_SPAN_SNAP_RADIUS = 0.16
+
 type SegmentNode = {
   start: FencePlanPoint
   end: FencePlanPoint
@@ -57,46 +60,68 @@ function findFenceSnapTarget(
   fences: FenceNode[],
   ignoreFenceIds: string[] = [],
 ): FencePlanPoint | null {
-  const radiusSquared = 0.35 ** 2
+  const cornerRadiusSquared = FENCE_CORNER_SNAP_RADIUS ** 2
+  const spanRadiusSquared = FENCE_SPAN_SNAP_RADIUS ** 2
   const ignoredFenceIds = new Set(ignoreFenceIds)
-  let bestTarget: FencePlanPoint | null = null
-  let bestDistanceSquared = Number.POSITIVE_INFINITY
+  let bestCornerTarget: FencePlanPoint | null = null
+  let bestCornerDistanceSquared = Number.POSITIVE_INFINITY
+  let bestSpanTarget: FencePlanPoint | null = null
+  let bestSpanDistanceSquared = Number.POSITIVE_INFINITY
 
   for (const fence of fences) {
     if (ignoredFenceIds.has(fence.id)) {
       continue
     }
 
-    const candidates: Array<FencePlanPoint | null> = [fence.start, fence.end]
-    if (isCurvedWall(fence)) {
-      const sampleCount = Math.max(8, Math.ceil(getWallCurveLength(fence) / 0.3))
-      for (let index = 0; index <= sampleCount; index += 1) {
-        const frame = getWallCurveFrameAt(fence, index / sampleCount)
-        candidates.push([frame.point.x, frame.point.y])
+    for (const candidate of [fence.start, fence.end]) {
+      const candidateDistanceSquared = distanceSquared(point, candidate)
+      if (
+        candidateDistanceSquared > cornerRadiusSquared ||
+        candidateDistanceSquared >= bestCornerDistanceSquared
+      ) {
+        continue
       }
-    } else {
-      candidates.push(projectPointOntoSegment(point, fence))
+
+      bestCornerTarget = candidate
+      bestCornerDistanceSquared = candidateDistanceSquared
     }
 
-    for (const candidate of candidates) {
+    if (isCurvedWall(fence)) {
+      const sampleCount = Math.max(8, Math.ceil(getWallCurveLength(fence) / 0.3))
+      for (let index = 1; index < sampleCount; index += 1) {
+        const frame = getWallCurveFrameAt(fence, index / sampleCount)
+        const candidate: FencePlanPoint = [frame.point.x, frame.point.y]
+        const candidateDistanceSquared = distanceSquared(point, candidate)
+        if (
+          candidateDistanceSquared > spanRadiusSquared ||
+          candidateDistanceSquared >= bestSpanDistanceSquared
+        ) {
+          continue
+        }
+
+        bestSpanTarget = candidate
+        bestSpanDistanceSquared = candidateDistanceSquared
+      }
+    } else {
+      const candidate = projectPointOntoSegment(point, fence)
       if (!candidate) {
         continue
       }
 
       const candidateDistanceSquared = distanceSquared(point, candidate)
       if (
-        candidateDistanceSquared > radiusSquared ||
-        candidateDistanceSquared >= bestDistanceSquared
+        candidateDistanceSquared > spanRadiusSquared ||
+        candidateDistanceSquared >= bestSpanDistanceSquared
       ) {
         continue
       }
 
-      bestTarget = candidate
-      bestDistanceSquared = candidateDistanceSquared
+      bestSpanTarget = candidate
+      bestSpanDistanceSquared = candidateDistanceSquared
     }
   }
 
-  return bestTarget
+  return bestCornerTarget ?? bestSpanTarget
 }
 
 export function snapFenceDraftPoint(args: {
diff --git a/packages/editor/src/components/tools/fence/move-fence-endpoint-tool.tsx b/packages/editor/src/components/tools/fence/move-fence-endpoint-tool.tsx
index 8ebb774e..5bbadedd 100644
--- a/packages/editor/src/components/tools/fence/move-fence-endpoint-tool.tsx
+++ b/packages/editor/src/components/tools/fence/move-fence-endpoint-tool.tsx
@@ -25,8 +25,13 @@ import {
 import { isWallLongEnough } from '../wall/wall-drafting'
 import { type FencePlanPoint, snapFenceDraftPoint } from './fence-drafting'
 
+const LINKED_FENCE_ENDPOINT_EPSILON = 0.025
+
 function samePoint(a: FencePlanPoint, b: FencePlanPoint) {
-  return a[0] === b[0] && a[1] === b[1]
+  return (
+    Math.abs(a[0] - b[0]) <= LINKED_FENCE_ENDPOINT_EPSILON &&
+    Math.abs(a[1] - b[1]) <= LINKED_FENCE_ENDPOINT_EPSILON
+  )
 }
 
 type SegmentLike = {
@@ -114,10 +119,9 @@ type LinkedFenceSnapshot = {
 function getLinkedFenceSnapshots(args: {
   fenceId: FenceNode['id']
   fenceParentId: string | null
-  originalStart: FencePlanPoint
-  originalEnd: FencePlanPoint
+  linkedPoint: FencePlanPoint
 }) {
-  const { fenceId, fenceParentId, originalStart, originalEnd } = args
+  const { fenceId, fenceParentId, linkedPoint } = args
   const { nodes } = useScene.getState()
   const snapshots: LinkedFenceSnapshot[] = []
 
@@ -130,12 +134,7 @@ function getLinkedFenceSnapshots(args: {
       continue
     }
 
-    if (
-      !samePoint(node.start, originalStart) &&
-      !samePoint(node.start, originalEnd) &&
-      !samePoint(node.end, originalStart) &&
-      !samePoint(node.end, originalEnd)
-    ) {
+    if (!samePoint(node.start, linkedPoint) && !samePoint(node.end, linkedPoint)) {
       continue
     }
 
@@ -152,24 +151,14 @@ function getLinkedFenceSnapshots(args: {
 
 function getLinkedFenceUpdates(
   linkedFences: LinkedFenceSnapshot[],
-  originalStart: FencePlanPoint,
-  originalEnd: FencePlanPoint,
-  nextStart: FencePlanPoint,
-  nextEnd: FencePlanPoint,
+  linkedPoint: FencePlanPoint,
+  nextLinkedPoint: FencePlanPoint,
 ) {
   return linkedFences.map((fence) => ({
     id: fence.id,
     curveOffset: fence.curveOffset,
-    start: samePoint(fence.start, originalStart)
-      ? nextStart
-      : samePoint(fence.start, originalEnd)
-        ? nextEnd
-        : fence.start,
-    end: samePoint(fence.end, originalStart)
-      ? nextStart
-      : samePoint(fence.end, originalEnd)
-        ? nextEnd
-        : fence.end,
+    start: samePoint(fence.start, linkedPoint) ? nextLinkedPoint : fence.start,
+    end: samePoint(fence.end, linkedPoint) ? nextLinkedPoint : fence.end,
   }))
 }
 
@@ -181,6 +170,11 @@ export const MoveFenceEndpointTool: React.FC<{ target: MovingFenceEndpoint }> =
   const nodeIdRef = useRef(target.fence.id)
   const originalStartRef = useRef<FencePlanPoint>([...target.fence.start] as FencePlanPoint)
   const originalEndRef = useRef<FencePlanPoint>([...target.fence.end] as FencePlanPoint)
+  const originalMovingPointRef = useRef<FencePlanPoint>(
+    target.endpoint === 'start'
+      ? ([...target.fence.start] as FencePlanPoint)
+      : ([...target.fence.end] as FencePlanPoint),
+  )
   const fixedPointRef = useRef<FencePlanPoint>(
     target.endpoint === 'start'
       ? ([...target.fence.end] as FencePlanPoint)
@@ -190,8 +184,7 @@ export const MoveFenceEndpointTool: React.FC<{ target: MovingFenceEndpoint }> =
     getLinkedFenceSnapshots({
       fenceId: target.fence.id,
       fenceParentId: target.fence.parentId ?? null,
-      originalStart: target.fence.start,
-      originalEnd: target.fence.end,
+      linkedPoint: target.endpoint === 'start' ? target.fence.start : target.fence.end,
     }),
   )
   const previewRef = useRef<{ start: FencePlanPoint; end: FencePlanPoint } | null>(null)
@@ -211,6 +204,7 @@ export const MoveFenceEndpointTool: React.FC<{ target: MovingFenceEndpoint }> =
     const nodeId = nodeIdRef.current
     const originalStart = originalStartRef.current
     const originalEnd = originalEndRef.current
+    const originalMovingPoint = originalMovingPointRef.current
     const fixedPoint = fixedPointRef.current
     const siblings = Object.values(useScene.getState().nodes)
     const levelWalls = siblings.filter(
@@ -244,13 +238,7 @@ export const MoveFenceEndpointTool: React.FC<{ target: MovingFenceEndpoint }> =
       const nextEnd = target.endpoint === 'end' ? movingPoint : fixedPoint
       const linkedUpdates = detachLinkedFences
         ? []
-        : getLinkedFenceUpdates(
-            linkedOriginalsRef.current,
-            originalStart,
-            originalEnd,
-            nextStart,
-            nextEnd,
-          )
+        : getLinkedFenceUpdates(linkedOriginalsRef.current, originalMovingPoint, movingPoint)
       previewRef.current = { start: nextStart, end: nextEnd }
       setCursorLocalPos([movingPoint[0], 0, movingPoint[1]])
       setAngleLabel(
@@ -321,10 +309,8 @@ export const MoveFenceEndpointTool: React.FC<{ target: MovingFenceEndpoint }> =
             ? []
             : getLinkedFenceUpdates(
                 linkedOriginalsRef.current,
-                originalStart,
-                originalEnd,
-                preview.start,
-                preview.end,
+                originalMovingPoint,
+                target.endpoint === 'start' ? preview.start : preview.end,
               )),
         ])
         pauseSceneHistory(useScene)
diff --git a/packages/editor/src/components/tools/select/box-select-tool.tsx b/packages/editor/src/components/tools/select/box-select-tool.tsx
index 8dd700a6..6a86db7d 100644
--- a/packages/editor/src/components/tools/select/box-select-tool.tsx
+++ b/packages/editor/src/components/tools/select/box-select-tool.tsx
@@ -1,7 +1,10 @@
+import '../../../three-types'
+
 import { Icon } from '@iconify/react'
 import {
   type AnyNodeId,
   type CeilingNode,
+  type ColumnNode,
   emitter,
   type GridEvent,
   type ItemNode,
@@ -14,6 +17,7 @@ import {
 } from '@pascal-app/core'
 import { useViewer } from '@pascal-app/viewer'
 import { useThree } from '@react-three/fiber'
+import type { ThreeElements } from '@react-three/fiber'
 import { useEffect, useRef } from 'react'
 import {
   Box3,
@@ -34,6 +38,12 @@ import { sfxEmitter } from '../../../lib/sfx-bus'
 import useEditor from '../../../store/use-editor'
 import { CursorSphere } from '../shared/cursor-sphere'
 
+declare module 'react/jsx-runtime' {
+  namespace JSX {
+    interface IntrinsicElements extends ThreeElements {}
+  }
+}
+
 /**
  * Module-level flag to prevent the SelectionManager from deselecting
  * on the grid:click that fires right after a box-select drag completes.
@@ -240,6 +250,11 @@ function collectNodeIdsInBounds(bounds: Bounds): string[] {
         if (objectBoundsIntersectsBounds(node.id, bounds)) {
           result.push(node.id)
         }
+      } else if (node.type === 'column') {
+        const column = node as ColumnNode
+        if (objectBoundsIntersectsBounds(column.id, bounds)) {
+          result.push(column.id)
+        }
       }
     }
   } else if (phase === 'structure' && structureLayer === 'zones') {
diff --git a/packages/editor/src/components/ui/floating-level-selector.tsx b/packages/editor/src/components/ui/floating-level-selector.tsx
index c348a303..f251a001 100755
--- a/packages/editor/src/components/ui/floating-level-selector.tsx
+++ b/packages/editor/src/components/ui/floating-level-selector.tsx
@@ -26,7 +26,7 @@ import {
   useScene,
 } from '@pascal-app/core'
 import { useViewer } from '@pascal-app/viewer'
-import { Copy, GripVertical, MoreVertical, Plus, Trash2 } from 'lucide-react'
+import { ClipboardPaste, Copy, GripVertical, MoreVertical, Plus, Trash2 } from 'lucide-react'
 import {
   type ButtonHTMLAttributes,
   type CSSProperties,
@@ -34,6 +34,7 @@ import {
   useEffect,
   useRef,
   useState,
+  useSyncExternalStore,
 } from 'react'
 import { useShallow } from 'zustand/react/shallow'
 import {
@@ -41,6 +42,12 @@ import {
   type LevelDuplicatePreset,
 } from '../../lib/level-duplication'
 import { deleteLevelWithFallbackSelection } from '../../lib/level-selection'
+import {
+  getEditorClipboardSnapshot,
+  pasteEditorClipboardToLevel,
+  subscribeEditorClipboard,
+} from '../../lib/scene-clipboard'
+import { sfxEmitter } from '../../lib/sfx-bus'
 import { cn } from '../../lib/utils'
 import { LevelDuplicateDialog } from './level-duplicate-dialog'
 import {
@@ -126,6 +133,7 @@ function LevelRow({
   dragHandleRef,
   onSelect,
   onDuplicate,
+  onPaste,
   onRequestDelete,
 }: {
   level: LevelNode
@@ -135,6 +143,7 @@ function LevelRow({
   dragHandleRef?: (element: HTMLButtonElement | null) => void
   onSelect: () => void
   onDuplicate: (preset?: LevelDuplicatePreset) => void
+  onPaste?: () => void
   onRequestDelete: () => void
 }) {
   const [duplicateDialogOpen, setDuplicateDialogOpen] = useState(false)
@@ -223,6 +232,19 @@ function LevelRow({
                 <Copy className="h-3 w-3" />
                 Duplicate with options...
               </button>
+              {onPaste && (
+                <button
+                  className="flex w-full items-center gap-2 rounded-md px-2.5 py-1.5 text-left text-muted-foreground text-xs transition-colors hover:bg-white/10 hover:text-foreground"
+                  onClick={(e) => {
+                    e.stopPropagation()
+                    onPaste()
+                  }}
+                  type="button"
+                >
+                  <ClipboardPaste className="h-3 w-3" />
+                  Paste copied selection
+                </button>
+              )}
               <button
                 className="flex w-full items-center gap-2 rounded-md px-2.5 py-1.5 text-left text-muted-foreground text-xs transition-colors hover:bg-white/10 hover:text-red-400"
                 onClick={(e) => {
@@ -256,12 +278,14 @@ function SortableLevelRow({
   isSelected,
   onSelect,
   onDuplicate,
+  onPaste,
   onRequestDelete,
 }: {
   level: LevelNode
   isSelected: boolean
   onSelect: () => void
   onDuplicate: (preset?: LevelDuplicatePreset) => void
+  onPaste?: () => void
   onRequestDelete: () => void
 }) {
   const {
@@ -291,6 +315,7 @@ function SortableLevelRow({
         isSelected={isSelected}
         level={level}
         onDuplicate={onDuplicate}
+        onPaste={onPaste}
         onRequestDelete={onRequestDelete}
         onSelect={onSelect}
       />
@@ -310,6 +335,11 @@ export function FloatingLevelSelector() {
 
   const [deletingLevel, setDeletingLevel] = useState<LevelNode | null>(null)
   const [draggingLevelId, setDraggingLevelId] = useState<string | null>(null)
+  const clipboardSnapshot = useSyncExternalStore(
+    subscribeEditorClipboard,
+    getEditorClipboardSnapshot,
+    getEditorClipboardSnapshot,
+  )
   const sensors = useSensors(
     useSensor(PointerSensor, {
       activationConstraint: { distance: 4 },
@@ -424,6 +454,13 @@ export function FloatingLevelSelector() {
     [createNodes, levels, resolvedBuildingId, setSelection, updateNodes],
   )
 
+  const handlePasteToLevel = useCallback((level: LevelNode) => {
+    const result = pasteEditorClipboardToLevel(level.id)
+    if (result?.pastedIds.length) {
+      sfxEmitter.emit('sfx:item-place')
+    }
+  }, [])
+
   const handleDragStart = useCallback((event: DragStartEvent) => {
     setDraggingLevelId(String(event.active.id))
   }, [])
@@ -523,6 +560,9 @@ export function FloatingLevelSelector() {
                         isSelected={isSelected}
                         level={level}
                         onDuplicate={(preset) => handleDuplicateLevel(level, preset)}
+                        onPaste={
+                          clipboardSnapshot ? () => handlePasteToLevel(level) : undefined
+                        }
                         onRequestDelete={() => setDeletingLevel(level)}
                         onSelect={() =>
                           setSelection(
diff --git a/packages/editor/src/hooks/use-keyboard.ts b/packages/editor/src/hooks/use-keyboard.ts
index 4e565c94..3183fd56 100755
--- a/packages/editor/src/hooks/use-keyboard.ts
+++ b/packages/editor/src/hooks/use-keyboard.ts
@@ -3,6 +3,10 @@ import { useViewer } from '@pascal-app/viewer'
 import { useEffect } from 'react'
 import { closeDoorOpenState, toggleDoorOpenState } from '../lib/door-interaction'
 import { runRedo, runUndo } from '../lib/history'
+import {
+  copySelectedNodesToEditorClipboard,
+  pasteEditorClipboardToLevel,
+} from '../lib/scene-clipboard'
 import { sfxEmitter } from '../lib/sfx-bus'
 import { closeWindowOpenState, toggleWindowOpenState } from '../lib/window-interaction'
 import useEditor from '../store/use-editor'
@@ -105,6 +109,17 @@ export const useKeyboard = ({
         useEditor.getState().setPhase('structure')
         useEditor.getState().setStructureLayer('elements')
         useEditor.getState().setMode('material-paint')
+      } else if (e.key === 'c' && (e.metaKey || e.ctrlKey) && !e.shiftKey) {
+        if (isVersionPreviewMode) return
+        e.preventDefault()
+        copySelectedNodesToEditorClipboard()
+      } else if (e.key === 'v' && (e.metaKey || e.ctrlKey) && !e.shiftKey) {
+        if (isVersionPreviewMode) return
+        e.preventDefault()
+        const result = pasteEditorClipboardToLevel()
+        if (result?.pastedIds.length) {
+          sfxEmitter.emit('sfx:item-place')
+        }
       } else if (e.key === 'z' && (e.metaKey || e.ctrlKey)) {
         if (isVersionPreviewMode) return
         e.preventDefault()
diff --git a/packages/editor/src/lib/floorplan/selection-tool.ts b/packages/editor/src/lib/floorplan/selection-tool.ts
index f6827e95..15e133f0 100644
--- a/packages/editor/src/lib/floorplan/selection-tool.ts
+++ b/packages/editor/src/lib/floorplan/selection-tool.ts
@@ -1,5 +1,6 @@
 import type {
   CeilingNode,
+  ColumnNode,
   DoorNode,
   ItemNode,
   Point2D,
@@ -53,6 +54,11 @@ type CeilingEntry = {
   holes: Point2D[][]
 }
 
+type ColumnEntry = {
+  column: ColumnNode
+  polygon: Point2D[]
+}
+
 type RoofEntry = {
   roof: RoofNode
   segments: Array<{
@@ -71,6 +77,7 @@ type FloorplanSelectionToolContext = {
   walls: WallEntry[]
   slabs: SlabEntry[]
   ceilings: CeilingEntry[]
+  columns: ColumnEntry[]
   roofs: RoofEntry[]
   openingHitTolerance: number
   wallHitTolerance: number
@@ -123,6 +130,13 @@ export function getFloorplanHitNodeId(context: FloorplanSelectionToolContext) {
       return stairHit.stair.id
     }
 
+    const columnHit = context.columns.find(({ polygon }) =>
+      isPointInsidePolygon(context.point, polygon),
+    )
+    if (columnHit) {
+      return columnHit.column.id
+    }
+
     const wallHit = context.walls.find(
       ({ wall, polygon }) =>
         isPointInsidePolygon(context.point, polygon) ||
@@ -166,6 +180,7 @@ type FloorplanSelectionBoundsContext = {
   openings: OpeningPolygonEntry[]
   slabs: SlabEntry[]
   ceilings: CeilingEntry[]
+  columns: ColumnEntry[]
   stairs: StairEntry[]
   roofs: RoofEntry[]
 }
@@ -179,6 +194,7 @@ export function getFloorplanSelectionIdsInBounds({
   openings,
   slabs,
   ceilings,
+  columns,
   stairs,
   roofs,
 }: FloorplanSelectionBoundsContext) {
@@ -204,6 +220,9 @@ export function getFloorplanSelectionIdsInBounds({
   const ceilingIds = ceilings
     .filter(({ polygon }) => doesPolygonIntersectSelectionBounds(polygon, bounds))
     .map(({ ceiling }) => ceiling.id)
+  const columnIds = columns
+    .filter(({ polygon }) => doesPolygonIntersectSelectionBounds(polygon, bounds))
+    .map(({ column }) => column.id)
   const stairIds = stairs
     .filter((stair) =>
       getStairHitPolygons(stair).some((polygon) =>
@@ -224,6 +243,7 @@ export function getFloorplanSelectionIdsInBounds({
       ...openingIds,
       ...slabIds,
       ...ceilingIds,
+      ...columnIds,
       ...stairIds,
       ...roofIds,
     ]),
diff --git a/packages/editor/src/lib/scene-clipboard.ts b/packages/editor/src/lib/scene-clipboard.ts
new file mode 100644
index 00000000..4cbbef3a
--- /dev/null
+++ b/packages/editor/src/lib/scene-clipboard.ts
@@ -0,0 +1,267 @@
+import {
+  AnyNode,
+  type AnyNodeId,
+  generateId,
+  type LevelNode,
+  type StairNode,
+  useScene,
+} from '@pascal-app/core'
+import { useViewer } from '@pascal-app/viewer'
+
+type ClipboardPayload = {
+  copiedAt: number
+  nodes: AnyNode[]
+  rootIds: AnyNodeId[]
+}
+
+type PasteResult = {
+  pastedIds: AnyNodeId[]
+  skippedIds: AnyNodeId[]
+}
+
+const COPYABLE_ROOT_TYPES = new Set<AnyNode['type']>([
+  'wall',
+  'fence',
+  'column',
+  'item',
+  'slab',
+  'ceiling',
+  'roof',
+  'stair',
+  'spawn',
+  'zone',
+])
+
+let clipboardPayload: ClipboardPayload | null = null
+const subscribers = new Set<() => void>()
+
+function notifySubscribers() {
+  for (const subscriber of subscribers) {
+    subscriber()
+  }
+}
+
+export function subscribeEditorClipboard(subscriber: () => void) {
+  subscribers.add(subscriber)
+  return () => {
+    subscribers.delete(subscriber)
+  }
+}
+
+export function getEditorClipboardSnapshot() {
+  return clipboardPayload
+}
+
+export function hasEditorClipboard() {
+  return !!clipboardPayload && clipboardPayload.rootIds.length > 0
+}
+
+function extractIdPrefix(id: string) {
+  const underscoreIndex = id.indexOf('_')
+  return underscoreIndex === -1 ? 'node' : id.slice(0, underscoreIndex)
+}
+
+function collectSubtreeIds(
+  nodes: Record<AnyNodeId, AnyNode>,
+  rootId: AnyNodeId,
+  ids: Set<AnyNodeId>,
+) {
+  if (ids.has(rootId)) return
+  const node = nodes[rootId]
+  if (!node) return
+  ids.add(rootId)
+
+  if ('children' in node && Array.isArray(node.children)) {
+    for (const childId of node.children as AnyNodeId[]) {
+      collectSubtreeIds(nodes, childId, ids)
+    }
+  }
+}
+
+function hasSelectedAncestor(
+  nodes: Record<AnyNodeId, AnyNode>,
+  id: AnyNodeId,
+  selectedIds: Set<AnyNodeId>,
+) {
+  let parentId = nodes[id]?.parentId as AnyNodeId | null
+
+  while (parentId) {
+    if (selectedIds.has(parentId)) return true
+    parentId = nodes[parentId]?.parentId as AnyNodeId | null
+  }
+
+  return false
+}
+
+function isLevelChildRoot(nodes: Record<AnyNodeId, AnyNode>, node: AnyNode) {
+  const parentId = node.parentId as AnyNodeId | null
+  if (!parentId) return true
+  return nodes[parentId]?.type === 'level'
+}
+
+function getPasteTargetLevel(targetLevelId?: AnyNodeId) {
+  const scene = useScene.getState()
+  const resolvedLevelId =
+    targetLevelId ?? (useViewer.getState().selection.levelId as AnyNodeId | null)
+  if (!resolvedLevelId) return null
+
+  const level = scene.nodes[resolvedLevelId]
+  return level?.type === 'level' ? level : null
+}
+
+function getNextLevelId(level: LevelNode, nodes: Record<AnyNodeId, AnyNode>) {
+  const parentId = level.parentId as AnyNodeId | null
+  if (!parentId) return null
+
+  const building = nodes[parentId]
+  if (!building || building.type !== 'building') return null
+
+  const siblingLevels = building.children
+    .map((childId) => nodes[childId as AnyNodeId])
+    .filter((node): node is LevelNode => node?.type === 'level')
+
+  return (
+    siblingLevels
+      .filter((candidate) => candidate.level > level.level)
+      .sort((a, b) => a.level - b.level)[0]?.id ?? null
+  )
+}
+
+function remapNodeReferences(
+  node: AnyNode,
+  oldId: AnyNodeId,
+  targetLevel: LevelNode,
+  idMap: Map<AnyNodeId, AnyNodeId>,
+  rootIds: Set<AnyNodeId>,
+  nodes: Record<AnyNodeId, AnyNode>,
+) {
+  const clone = JSON.parse(JSON.stringify(node)) as AnyNode
+  ;(clone as Record<string, unknown>).id = idMap.get(oldId)
+
+  if (rootIds.has(oldId)) {
+    clone.parentId = targetLevel.id
+  } else if (clone.parentId && typeof clone.parentId === 'string') {
+    clone.parentId = idMap.get(clone.parentId as AnyNodeId) ?? clone.parentId
+  }
+
+  if ('children' in clone && Array.isArray(clone.children)) {
+    ;(clone as Record<string, unknown>).children = (clone.children as AnyNodeId[])
+      .map((childId) => idMap.get(childId))
+      .filter((childId): childId is AnyNodeId => !!childId)
+  }
+
+  if ('wallId' in clone && typeof clone.wallId === 'string') {
+    const nextWallId = idMap.get(clone.wallId as AnyNodeId)
+    if (nextWallId) {
+      ;(clone as Record<string, unknown>).wallId = nextWallId
+    } else {
+      delete (clone as Record<string, unknown>).wallId
+    }
+  }
+
+  if (clone.type === 'stair') {
+    const nextLevelId = getNextLevelId(targetLevel, nodes)
+    ;(clone as StairNode).fromLevelId = targetLevel.id
+    ;(clone as StairNode).toLevelId = nextLevelId
+  }
+
+  const metadata =
+    clone.metadata && typeof clone.metadata === 'object' && !Array.isArray(clone.metadata)
+      ? { ...(clone.metadata as Record<string, unknown>) }
+      : {}
+  delete metadata.isNew
+  delete metadata.isTransient
+  ;(clone as Record<string, unknown>).metadata = metadata
+
+  return AnyNode.parse(clone)
+}
+
+export function copySelectedNodesToEditorClipboard(selectedIds?: AnyNodeId[]) {
+  const scene = useScene.getState()
+  const ids = selectedIds ?? (useViewer.getState().selection.selectedIds as AnyNodeId[])
+  const selectedIdSet = new Set(ids)
+  const rootIds = ids.filter((id) => {
+    const node = scene.nodes[id]
+    return (
+      node &&
+      COPYABLE_ROOT_TYPES.has(node.type) &&
+      isLevelChildRoot(scene.nodes, node) &&
+      !hasSelectedAncestor(scene.nodes, id, selectedIdSet)
+    )
+  })
+
+  if (rootIds.length === 0) {
+    return false
+  }
+
+  const subtreeIds = new Set<AnyNodeId>()
+  for (const rootId of rootIds) {
+    collectSubtreeIds(scene.nodes, rootId, subtreeIds)
+  }
+
+  clipboardPayload = {
+    copiedAt: Date.now(),
+    nodes: [...subtreeIds]
+      .map((id) => scene.nodes[id])
+      .filter((node): node is AnyNode => !!node)
+      .map((node) => JSON.parse(JSON.stringify(node)) as AnyNode),
+    rootIds,
+  }
+  notifySubscribers()
+
+  return true
+}
+
+export function pasteEditorClipboardToLevel(targetLevelId?: AnyNodeId): PasteResult | null {
+  const payload = clipboardPayload
+  const targetLevel = getPasteTargetLevel(targetLevelId)
+  if (!payload || !targetLevel) return null
+
+  const scene = useScene.getState()
+  const idMap = new Map<AnyNodeId, AnyNodeId>()
+
+  for (const node of payload.nodes) {
+    idMap.set(node.id as AnyNodeId, generateId(extractIdPrefix(node.id)) as AnyNodeId)
+  }
+
+  const rootIdSet = new Set(payload.rootIds)
+  const pastedNodes: AnyNode[] = []
+  const skippedIds: AnyNodeId[] = []
+
+  for (const node of payload.nodes) {
+    try {
+      pastedNodes.push(
+        remapNodeReferences(node, node.id as AnyNodeId, targetLevel, idMap, rootIdSet, scene.nodes),
+      )
+    } catch (error) {
+      console.error('Failed to paste copied node', node.id, error)
+      skippedIds.push(node.id as AnyNodeId)
+    }
+  }
+
+  if (pastedNodes.length === 0) {
+    return { pastedIds: [], skippedIds }
+  }
+
+  scene.createNodes(
+    pastedNodes.map((node) => ({
+      node,
+      parentId: (node.parentId as AnyNodeId | null) ?? undefined,
+    })),
+  )
+
+  const pastedNodeIds = new Set(pastedNodes.map((node) => node.id as AnyNodeId))
+  const pastedRootIds = payload.rootIds
+    .map((rootId) => idMap.get(rootId))
+    .filter((id): id is AnyNodeId => !!id && pastedNodeIds.has(id))
+
+  useViewer.getState().setSelection({
+    levelId: targetLevel.id,
+    selectedIds: pastedRootIds,
+  })
+
+  return {
+    pastedIds: pastedRootIds,
+    skippedIds,
+  }
+}
diff --git a/packages/viewer/src/components/renderers/column/column-renderer.tsx b/packages/viewer/src/components/renderers/column/column-renderer.tsx
index e97adc59..75e4d4f7 100644
--- a/packages/viewer/src/components/renderers/column/column-renderer.tsx
+++ b/packages/viewer/src/components/renderers/column/column-renderer.tsx
@@ -181,23 +181,55 @@ function FlatEndedBeam({
       [3, 7, 4, 0],
     ];
     const positions: number[] = [];
-    const pushTriangle = (a: number, b: number, c: number) => {
+    const uvs: number[] = [];
+    const pushVertex = (vertexIndex: number, uv: [number, number]) => {
+      const vertex = vertices[vertexIndex];
+      if (!vertex) return false;
+      positions.push(...vertex);
+      uvs.push(...uv);
+      return true;
+    };
+    const pushTriangle = (
+      a: number,
+      b: number,
+      c: number,
+      uvA: [number, number],
+      uvB: [number, number],
+      uvC: [number, number],
+    ) => {
       const va = vertices[a];
       const vb = vertices[b];
       const vc = vertices[c];
       if (!va || !vb || !vc) return;
-      positions.push(...va, ...vb, ...vc);
+      pushVertex(a, uvA);
+      pushVertex(b, uvB);
+      pushVertex(c, uvC);
     };
 
     for (const [a, b, c, d] of faceQuads) {
-      pushTriangle(a, b, c);
-      pushTriangle(a, c, d);
-      pushTriangle(a, c, b);
-      pushTriangle(a, d, c);
+      const va = vertices[a];
+      const vb = vertices[b];
+      const vc = vertices[c];
+      const vd = vertices[d];
+      if (!va || !vb || !vc || !vd) continue;
+
+      const edgeU = Math.hypot(vb[0] - va[0], vb[1] - va[1], vb[2] - va[2]);
+      const edgeV = Math.hypot(vd[0] - va[0], vd[1] - va[1], vd[2] - va[2]);
+      const uvA: [number, number] = [0, 0];
+      const uvB: [number, number] = [edgeU, 0];
+      const uvC: [number, number] = [edgeU, edgeV];
+      const uvD: [number, number] = [0, edgeV];
+
+      pushTriangle(a, b, c, uvA, uvB, uvC);
+      pushTriangle(a, c, d, uvA, uvC, uvD);
+      pushTriangle(a, c, b, uvA, uvC, uvB);
+      pushTriangle(a, d, c, uvA, uvD, uvC);
     }
 
     const geometry = new BufferGeometry();
     geometry.setAttribute("position", new Float32BufferAttribute(positions, 3));
+    geometry.setAttribute("uv", new Float32BufferAttribute(uvs, 2));
+    geometry.setAttribute("uv2", new Float32BufferAttribute(uvs.slice(), 2));
     geometry.computeVertexNormals();
     return geometry;
   }, [depth, length, start, end, width]);
diff --git a/packages/viewer/src/systems/slab/slab-system.tsx b/packages/viewer/src/systems/slab/slab-system.tsx
index d9f02df9..3d866445 100644
--- a/packages/viewer/src/systems/slab/slab-system.tsx
+++ b/packages/viewer/src/systems/slab/slab-system.tsx
@@ -1,11 +1,12 @@
-import { useFrame } from '@react-three/fiber'
 import {
   type AnyNodeId,
   getRenderableSlabPolygon,
-  sceneRegistry,
   type SlabNode,
+  sceneRegistry,
   useScene,
 } from '@pascal-app/core'
+import { useFrame } from '@react-three/fiber'
+import { useEffect } from 'react'
 import * as THREE from 'three'
 
 function ensureUv2Attribute(geometry: THREE.BufferGeometry) {
@@ -22,6 +23,16 @@ function ensureUv2Attribute(geometry: THREE.BufferGeometry) {
 export const SlabSystem = () => {
   const dirtyNodes = useScene((state) => state.dirtyNodes)
   const clearDirty = useScene((state) => state.clearDirty)
+  const markDirty = useScene((state) => state.markDirty)
+
+  useEffect(() => {
+    const nodes = useScene.getState().nodes
+    for (const node of Object.values(nodes)) {
+      if (node.type === 'slab') {
+        markDirty(node.id)
+      }
+    }
+  }, [markDirty])
 
   useFrame(() => {
     if (dirtyNodes.size === 0) return