feat(materials): dynamic library registry, picker source tabs, Other category (#525)

* feat(materials): dynamic library registry, picker source tabs, create-material entry point

Core gains a runtime material registry (registerLibraryMaterials/
unregisterLibraryMaterials/subscribeLibraryMaterials) so embedders can
feed user/community materials; library: refs to registered materials
resolve in the viewer unchanged. MaterialCatalogItem carries an optional
source (pascal|community|mine|workspace). MaterialPicker gets a source
filter row and an optional onCreateMaterialRequest '+ New material'
tile, threaded through MaterialPaintPanel.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* fix(materials): underline source tabs in picker, matching catalog browse surfaces

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* feat(materials): add 'other' category for uncategorized library materials

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* fix(viewer): rebuild node material when a texture slot is cleared

Reused cached WebGPU materials keep a compiled TextureNode per slot; nulling
the slot for a cold texture load (or a preset without the map) without
needsUpdate leaves the node's per-frame material reference pulling null,
crashing the render pass in TextureNode.update. Cold loads are the norm for
freshly generated library materials, whose maps aren't in the texture cache.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* fix(viewer): standard materials always carry a displacement texture

three's WebGPU shadow pass copies each object's displacementMap onto one
shared per-light shadow material while caching per-mesh shadow node graphs
against that shared override. A mesh whose shadow graph was built with a
displacement TextureNode (painted with a generated material — the only
presets carrying height maps) crashes the render pass with "null (reading
'matrix')" the moment a material without a displacement texture is swapped
onto it, which is exactly what the paint hover preview does. Give every
MeshStandardNodeMaterial a shared 1x1 black displacement texel (zero offset)
when it has no real height map, so the copied slot is never null in either
direction.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

packages/core/src/index.ts

@@ -157,7 +157,9 @@ export {
 } from './lib/zone-quantities'
 export {
   getCatalogMaterialById,
+  getDynamicLibraryMaterials,
   getLibraryMaterialIdFromRef,
+  getLibraryMaterialsVersion,
   getMaterialPresetByRef,
   getMaterialsForCategory,
   getSceneMaterialIdFromRef,
@@ -168,12 +170,16 @@ export {
   type MaterialCatalogItem,
   type MaterialCategory,
   type MaterialRef,
+  type MaterialSource,
   type MaterialSurface,
   type ParsedMaterialRef,
   parseMaterialRef,
+  registerLibraryMaterials,
   SCENE_MATERIAL_REF_PREFIX,
+  subscribeLibraryMaterials,
   toLibraryMaterialRef,
   toSceneMaterialRef,
+  unregisterLibraryMaterials,
 } from './material-library'
 export type {
   FloorPlacedFootprint,

packages/core/src/material-library.ts

@@ -4,10 +4,14 @@ import {
   MaterialTarget as MaterialTargetSchema,
 } from './schema/material'
 
+export type MaterialSource = 'pascal' | 'community' | 'mine' | 'workspace'
+
 export type MaterialCatalogItem = {
   id: string
   label: string
   category: MaterialCategory
+  /** Origin of the entry. Absent = 'pascal' (all static catalog entries). */
+  source?: MaterialSource
   /**
    * Where this finish is appropriate. Absent = universal (e.g. flat colors).
    * The paint picker may filter by the slot being painted; v1 shows everything.
@@ -69,6 +73,7 @@ export const MATERIAL_CATEGORIES = [
   'roofing',
   'ground',
   'glass',
+  'other',
 ] as const
 export type MaterialCategory = (typeof MATERIAL_CATEGORIES)[number]
 
@@ -4149,13 +4154,64 @@ export const MATERIAL_CATALOG: MaterialCatalogItem[] = [
   },
 ]
 
+const STATIC_CATALOG_IDS = new Set(MATERIAL_CATALOG.map((item) => item.id))
+
+// Embedder-registered library materials (user/community/workspace). Core stays
+// passive: hosts push entries in; nothing here fetches. Static catalog entries
+// win on id collision so a registration can never shadow a built-in.
+const dynamicLibraryMaterials = new Map<string, MaterialCatalogItem>()
+const dynamicLibraryListeners = new Set<() => void>()
+let dynamicLibraryVersion = 0
+
+function notifyDynamicLibraryChange(): void {
+  dynamicLibraryVersion += 1
+  for (const listener of [...dynamicLibraryListeners]) {
+    listener()
+  }
+}
+
+export function registerLibraryMaterials(items: MaterialCatalogItem[]): void {
+  if (items.length === 0) return
+  for (const item of items) {
+    dynamicLibraryMaterials.set(item.id, item)
+  }
+  notifyDynamicLibraryChange()
+}
+
+export function unregisterLibraryMaterials(ids: string[]): void {
+  let changed = false
+  for (const id of ids) {
+    changed = dynamicLibraryMaterials.delete(id) || changed
+  }
+  if (changed) notifyDynamicLibraryChange()
+}
+
+export function getDynamicLibraryMaterials(): MaterialCatalogItem[] {
+  return [...dynamicLibraryMaterials.values()]
+}
+
+export function subscribeLibraryMaterials(listener: () => void): () => void {
+  dynamicLibraryListeners.add(listener)
+  return () => {
+    dynamicLibraryListeners.delete(listener)
+  }
+}
+
+export function getLibraryMaterialsVersion(): number {
+  return dynamicLibraryVersion
+}
+
 export function getMaterialsForCategory(category: MaterialCategory): MaterialCatalogItem[] {
-  return MATERIAL_CATALOG.filter((item) => item.category === category)
+  const items = MATERIAL_CATALOG.filter((item) => item.category === category)
+  for (const item of dynamicLibraryMaterials.values()) {
+    if (item.category === category && !STATIC_CATALOG_IDS.has(item.id)) items.push(item)
+  }
+  return items
 }
 
 export function getCatalogMaterialById(id?: string): MaterialCatalogItem | undefined {
   if (!id) return undefined
-  return MATERIAL_CATALOG.find((item) => item.id === id)
+  return MATERIAL_CATALOG.find((item) => item.id === id) ?? dynamicLibraryMaterials.get(id)
 }
 
 export const LIBRARY_MATERIAL_REF_PREFIX = 'library:'

packages/editor/src/components/ui/controls/material-paint-panel.tsx

@@ -27,7 +27,12 @@ import { SceneMaterialList } from './scene-material-list'
  * fixed control/category header, a single scrolling catalog grid, and a fixed
  * scene-material footer (always visible, with a `+` to add a custom material).
  */
-export function MaterialPaintPanel() {
+export type MaterialPaintPanelProps = {
+  /** When provided, the catalog grid leads with a "New material" tile that invokes it. */
+  onCreateMaterialRequest?: () => void
+}
+
+export function MaterialPaintPanel({ onCreateMaterialRequest }: MaterialPaintPanelProps) {
   const activePaintMaterial = useEditor((state) => state.activePaintMaterial)
   const activePaintTarget = useEditor((state) => state.activePaintTarget)
   const setActivePaintMaterial = useEditor((state) => state.setActivePaintMaterial)
@@ -109,6 +114,7 @@ export function MaterialPaintPanel() {
       {/* Scrolls: category tabs (fixed inside) + catalog grid (the scroll). */}
       <div className="min-h-0 flex-1">
         <MaterialPicker
+          onCreateMaterialRequest={onCreateMaterialRequest}
           onSelectMaterialPreset={(materialPreset) => {
             setActivePaintMaterial({ materialPreset, sourceTarget: activePaintTarget })
           }}

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

@@ -2,44 +2,82 @@
 
 import {
   getCatalogMaterialById,
+  getDynamicLibraryMaterials,
   getLibraryMaterialIdFromRef,
+  getLibraryMaterialsVersion,
   getMaterialsForCategory,
   MATERIAL_CATEGORIES,
+  type MaterialCatalogItem,
+  type MaterialSource,
   type MaterialTarget,
+  subscribeLibraryMaterials,
   toLibraryMaterialRef,
 } from '@pascal-app/core'
-import { useEffect, useState } from 'react'
+import { Plus } from 'lucide-react'
+import { useEffect, useMemo, useState, useSyncExternalStore } from 'react'
 import { triggerSFX } from '../../../lib/sfx-bus'
 
-type MaterialPickerProps = {
+export type MaterialSourceFilter = 'all' | MaterialSource
+
+export type MaterialPickerProps = {
   selectedMaterialPreset?: string
   onSelectMaterialPreset?: (materialPreset: string) => void
   disabled?: boolean
   nodeType?: MaterialTarget
   hideSideControl?: boolean
+  onCreateMaterialRequest?: () => void
 }
 
+const SOURCE_FILTERS: { id: MaterialSourceFilter; label: string }[] = [
+  { id: 'all', label: 'All' },
+  { id: 'pascal', label: 'Pascal' },
+  { id: 'mine', label: 'Mine' },
+  { id: 'workspace', label: 'Workspace' },
+  { id: 'community', label: 'Community' },
+]
+
 function getCategoryLabel(category: (typeof MATERIAL_CATEGORIES)[number]) {
   return category.charAt(0).toUpperCase() + category.slice(1)
 }
 
+function filterBySource(items: MaterialCatalogItem[], filter: MaterialSourceFilter) {
+  if (filter === 'all') return items
+  return items.filter((item) => (item.source ?? 'pascal') === filter)
+}
+
 /**
- * Catalog material picker: a fixed row of category tabs over a scrollable grid
- * of swatches. Custom-material creation lives in the scene-material section
- * (the host's `+` action), not here, so it's available from any category.
+ * Catalog material picker: a fixed row of category tabs and a source filter row
+ * over a scrollable grid of swatches. Scene-material creation lives in the
+ * scene-material section (the host's `+` action); `onCreateMaterialRequest` is
+ * the host's entry point for authoring a new *library* material.
  */
 export function MaterialPicker({
   selectedMaterialPreset,
   onSelectMaterialPreset,
   disabled = false,
+  onCreateMaterialRequest,
 }: MaterialPickerProps) {
   const [selectedCategory, setSelectedCategory] = useState<(typeof MATERIAL_CATEGORIES)[number]>(
     MATERIAL_CATEGORIES[0],
   )
+  const [sourceFilter, setSourceFilter] = useState<MaterialSourceFilter>('all')
+  // Version counter so host registrations/unregistrations re-render the picker.
+  const libraryVersion = useSyncExternalStore(
+    subscribeLibraryMaterials,
+    getLibraryMaterialsVersion,
+    getLibraryMaterialsVersion,
+  )
+  const hasWorkspaceMaterials = useMemo(
+    () => getDynamicLibraryMaterials().some((item) => item.source === 'workspace'),
+    [libraryVersion],
+  )
+  const visibleSourceFilters = SOURCE_FILTERS.filter(
+    (filter) => filter.id !== 'workspace' || hasWorkspaceMaterials,
+  )
   const availableCategories = MATERIAL_CATEGORIES.filter(
     (category) => getMaterialsForCategory(category).length > 0,
   )
-  const catalogItems = getMaterialsForCategory(selectedCategory)
+  const catalogItems = filterBySource(getMaterialsForCategory(selectedCategory), sourceFilter)
 
   // Keep the visible category in sync with the externally-selected catalog
   // material (a `scene:` ref matches no catalog entry, so the tab stays put).
@@ -72,7 +110,7 @@ export function MaterialPicker({
               setSelectedCategory(category)
               // Auto-select the first material in the category so the brush is
               // immediately ready (and the swatch shows as selected).
-              const first = getMaterialsForCategory(category)[0]
+              const first = filterBySource(getMaterialsForCategory(category), sourceFilter)[0]
               if (first) handleCatalogSelect(first.id)
             }}
             type="button"
@@ -81,11 +119,52 @@ export function MaterialPicker({
           </button>
         ))}
       </div>
+      {/* Fixed source filter tabs — underline style, matching the catalog
+          browse surfaces (Items / Rooms / Build / Search) rather than the
+          pill-button category row above. */}
+      <div className="flex shrink-0 items-center gap-4 px-1">
+        {visibleSourceFilters.map((filter) => (
+          <button
+            className={`-mb-px border-b-2 px-0.5 py-1.5 font-medium text-xs transition-colors ${
+              sourceFilter === filter.id
+                ? 'border-foreground text-foreground'
+                : 'border-transparent text-muted-foreground hover:text-foreground'
+            }`}
+            key={filter.id}
+            onClick={() => {
+              triggerSFX('sfx:menu-click')
+              setSourceFilter(filter.id)
+            }}
+            onMouseEnter={() => triggerSFX('sfx:menu-hover')}
+            type="button"
+          >
+            {filter.label}
+          </button>
+        ))}
+      </div>
       {/* The only scrolling region. */}
       <div
         className="subtle-scrollbar grid min-h-0 flex-1 auto-rows-min gap-2 overflow-y-auto pb-1"
         style={{ gridTemplateColumns: 'repeat(auto-fill, minmax(72px, 1fr))' }}
       >
+        {onCreateMaterialRequest ? (
+          <button
+            className="group relative flex flex-col gap-1.5 rounded-xl p-1.5 transition-colors hover:cursor-pointer hover:bg-sidebar-accent"
+            onClick={() => {
+              triggerSFX('sfx:menu-click')
+              onCreateMaterialRequest()
+            }}
+            onMouseEnter={() => triggerSFX('sfx:menu-hover')}
+            type="button"
+          >
+            <div className="flex aspect-square w-full items-center justify-center rounded-lg border border-border/45 border-dashed">
+              <Plus className="size-5 text-muted-foreground group-hover:text-foreground" />
+            </div>
+            <span className="truncate px-0.5 text-left font-medium text-[11px] text-muted-foreground group-hover:text-foreground">
+              New material
+            </span>
+          </button>
+        ) : null}
         {catalogItems.map((item) => {
           const isSelected = selectedMaterialPreset === toLibraryMaterialRef(item.id)
           return (

packages/editor/src/index.tsx

@@ -207,8 +207,15 @@ export {
 } from './components/ui/action-menu/view-toggles'
 export { useCommandPalette } from './components/ui/command-palette'
 export { ActionButton, ActionGroup } from './components/ui/controls/action-button'
-export { MaterialPaintPanel } from './components/ui/controls/material-paint-panel'
-export { MaterialPicker } from './components/ui/controls/material-picker'
+export {
+  MaterialPaintPanel,
+  type MaterialPaintPanelProps,
+} from './components/ui/controls/material-paint-panel'
+export {
+  MaterialPicker,
+  type MaterialPickerProps,
+  type MaterialSourceFilter,
+} from './components/ui/controls/material-picker'
 export { MetricControl } from './components/ui/controls/metric-control'
 export { PanelSection } from './components/ui/controls/panel-section'
 export { SegmentedControl } from './components/ui/controls/segmented-control'

packages/viewer/src/lib/materials.ts

@@ -286,6 +286,40 @@ function getPresetTexture(
   return texture
 }
 
+// three's WebGPU shadow pass copies each object's base-material
+// `displacementMap` onto one shared per-light shadow material, while the
+// per-mesh shadow node graph is cached against that shared override. A mesh
+// whose graph was built with a displacement TextureNode crashes the render
+// pass ("Cannot read properties of null (reading 'matrix')") as soon as a
+// material *without* a displacement texture is swapped onto it — the paint
+// hover preview does exactly that. Standard node materials therefore always
+// carry a displacement texture: a shared 1×1 black texel (zero offset, so
+// shading is unchanged) whenever there is no real height map.
+let neutralDisplacement: THREE.Texture | null = null
+
+function getNeutralDisplacementTexture(): THREE.Texture {
+  if (!neutralDisplacement) {
+    neutralDisplacement = new THREE.DataTexture(new Uint8Array([0, 0, 0, 255]), 1, 1)
+    neutralDisplacement.needsUpdate = true
+  }
+  return neutralDisplacement
+}
+
+function ensureDisplacementFallback<T extends THREE.Material>(material: T): T {
+  const textureMaterial = material as THREE.Material as TextureMaterial
+  if (material instanceof MeshStandardNodeMaterial && !textureMaterial.displacementMap) {
+    textureMaterial.displacementMap = getNeutralDisplacementTexture()
+  }
+  return material
+}
+
+/** The value a cleared slot falls back to (never null for displacement). */
+function clearedSlotValue(material: CommonMaterial, slot: TextureSlot): THREE.Texture | null {
+  return slot === 'displacementMap' && material instanceof MeshStandardNodeMaterial
+    ? getNeutralDisplacementTexture()
+    : null
+}
+
 function createAssignedTexture(
   source: THREE.Texture,
   props: MaterialMapProperties,
@@ -360,7 +394,14 @@ function queueTextureAssignment(
   const textureMaterial = material as TextureMaterial
 
   if (!path) {
-    textureMaterial[slot] = null
+    const cleared = clearedSlotValue(material, slot)
+    if (textureMaterial[slot] !== cleared) {
+      // Rebuild the node graph: a cached WebGPU material keeps a TextureNode
+      // for the slot, whose per-frame material reference would pull the null
+      // and crash in TextureNode.update ("null (reading 'matrix')").
+      textureMaterial[slot] = cleared
+      material.needsUpdate = true
+    }
     return
   }
 
@@ -379,7 +420,15 @@ function queueTextureAssignment(
     return
   }
 
-  textureMaterial[slot] = null
+  // Cold load: clear the slot for the fetch window, and rebuild the node
+  // graph if it previously held a texture — reused cached materials otherwise
+  // keep a TextureNode whose reference pulls the null and crashes the render
+  // pass. Cold loads are the norm for freshly generated library materials.
+  const placeholder = clearedSlotValue(material, slot)
+  if (textureMaterial[slot] !== placeholder) {
+    textureMaterial[slot] = placeholder
+    material.needsUpdate = true
+  }
 
   loadPresetTexture(path, props, slot).then((texture) => {
     if (!texture) return
@@ -496,8 +545,9 @@ export function createMaterialFromPreset(
     return materialCache.get(cacheKey)!
   }
 
-  const material =
-    shading === 'solid' ? new MeshLambertNodeMaterial() : new MeshStandardNodeMaterial()
+  const material = ensureDisplacementFallback(
+    shading === 'solid' ? new MeshLambertNodeMaterial() : new MeshStandardNodeMaterial(),
+  )
   applyMaterialPresetToMaterials(material, preset)
   maybeApplyGlassFresnel(material)
   material.userData.__pascalCachedMaterial = true
@@ -541,14 +591,15 @@ export function createMaterial(
 
   if (map) materialParams.map = map
 
-  const threeMaterial =
+  const threeMaterial = ensureDisplacementFallback(
     shading === 'solid'
       ? new MeshLambertNodeMaterial(materialParams)
       : new MeshStandardNodeMaterial({
           ...materialParams,
           roughness: props.roughness,
           metalness: props.metalness,
-        })
+        }),
+  )
 
   maybeApplyGlassFresnel(threeMaterial)
   threeMaterial.userData.__pascalCachedMaterial = true
@@ -608,12 +659,14 @@ export function createDefaultMaterial(
     })
   }
 
-  return new MeshStandardNodeMaterial({
+  return ensureDisplacementFallback(
+    new MeshStandardNodeMaterial({
       color,
       roughness,
       metalness: 0,
       side: resolvedSide,
-  })
+    }),
+  )
 }
 
 function cachedDefaultMaterial(
@@ -704,14 +757,15 @@ export function DEFAULT_WINDOW_MATERIAL(shading: RenderShading = 'rendered'): TH
     transparent: true,
     side: THREE.FrontSide,
   }
-  const material =
+  const material = ensureDisplacementFallback(
     shading === 'solid'
       ? new MeshLambertNodeMaterial(params)
       : new MeshStandardNodeMaterial({
           ...params,
           roughness: 0.1,
           metalness: 0.1,
-        })
+        }),
+  )
   maybeApplyGlassFresnel(material)
   defaultMaterialCache.set(cacheKey, material)
   return material