Wassim SAMADandClaude Opus 4.7
7b946ce8b7
New page covering the geometry/renderer/system trio that registry-driven kinds opt into. Documents: - The three optional fields on NodeDefinition and when each applies - Generic <GeometrySystem> + <ParametricNodeRenderer> runtime - GeometryContext shape (resolve / children / siblings / parent) - Combination matrix for shelf / spawn / zone / door / window / GLB items - Migration recipe from custom renderer+system files to def.geometry - Rules around purity, dispose-on-rebuild, register-once renderers.md and systems.md gain "prefer registry-driven" banners and link out to the new page. Architecture README adds the page to the index so review-architecture skill picks it up. The pattern was validated by the shelf spike: inline-JSX geometry was visibly laggy on parametric edits; moving to a per-kind system reading dirtyNodes (mirroring door/wall/item) restored smoothness. The three- checkbox model generalises that win so most future kinds need only a pure geometry function. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
187 lines
10 KiB
Markdown
187 lines
10 KiB
Markdown
# Node definitions
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*The registry-driven composition model for node kinds.*
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Applies to: `packages/core/src/registry/`, `packages/nodes/src/<kind>/`, `packages/viewer/src/components/viewer/{registered-systems.tsx,node-renderer.tsx}`.
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A *node kind* — shelf, wall, door, item, spawn, zone — is described by a `NodeDefinition` registered with `nodeRegistry`. The definition is plain data + lazy module references. Three optional fields decide how the kind appears in the scene at runtime; pick whichever combination matches the kind's needs.
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This page covers those three fields. For the broader registry contract (schemas, capabilities, parametrics, MCP), see [the registry plan](../../../plans/editor-node-registry.md) in the private repo.
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## The three-checkbox model
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| Field | Purpose | Pick it when |
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|---|---|---|
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| `geometry?: (node, ctx) => Object3D` | Pure builder. Returns the meshes for this node. | The kind has parametric meshes that should rebuild when `updateNode` runs. |
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| `renderer?: () => Promise<{ default: ComponentType<{ node }> }>` | Optional custom React component. Owns mesh creation. | The kind needs JSX-only features: `<Html>`, `useGLTF`, drei helpers, instancing, TSL shader materials, R3F portals. |
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| `system?: () => Promise<{ default: ComponentType }>` | Optional per-frame component (`useFrame` returning `null`). | The kind needs imperative work per frame: animations, opacity transitions, named-mesh material poking, cross-kind dirty cascades. |
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The three fields are **independent**. There is no discriminator tag — presence is participation:
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```ts
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// shelf — pure geometry, no React, no per-frame work
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export const shelfDefinition: NodeDefinition<typeof ShelfNode> = {
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// ...
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geometry: buildShelfGeometry, // pure function in geometry.ts
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}
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// zone — built once via React (uses <Html>), animated per-frame via system
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export const zoneDefinition: NodeDefinition<typeof ZoneNode> = {
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// ...
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renderer: () => import('./renderer'), // composes <Html> + TSL materials
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system: { module: () => import('./system') }, // pokes uniforms per frame
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}
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// door — pure geometry + animation system
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export const doorDefinition: NodeDefinition<typeof DoorNode> = {
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// ...
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geometry: buildDoorGeometry,
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system: { module: () => import('./animation') }, // advances operationState
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}
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```
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## Runtime: how the three fields are wired
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Two framework components live in `packages/viewer/src/components/viewer/`:
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- **`<NodeRenderer>`** chooses what React mounts for a node:
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1. If `def.renderer` is set → mount the custom renderer.
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2. Otherwise → mount `<ParametricNodeRenderer>` — a thin empty `<group>` that registers with `sceneRegistry`, attaches pointer handlers via `useNodeEvents`, reads `useLiveTransforms` for drag overrides, and calls `useScene.getState().markDirty(node.id)` on mount.
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- **`<GeometrySystem>`** runs every frame:
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1. Read `dirtyNodes` from `useScene`.
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2. For each dirty node whose kind has `def.geometry`, look up the registered `Group` from `sceneRegistry`, build a `GeometryContext`, call `def.geometry(node, ctx)`, dispose old children, attach the new ones, call `clearDirty(id)`.
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3. Kinds with no `def.geometry` are skipped — their custom `def.renderer` handles geometry on its own.
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Per-kind `def.system` components mount alongside via `<RegisteredSystems>`. They run their own `useFrame` and can mark nodes dirty, address meshes by `getObjectByName`, advance animation state, etc. They run **in addition** to `GeometrySystem`, not instead of it.
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## `GeometryContext`
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The second arg to `geometry()` is scene read access for builders that reference other nodes by ID. Most kinds ignore it.
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```ts
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type GeometryContext = {
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resolve: <N = AnyNode>(id: AnyNodeId) => N | undefined
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children: AnyNode[] // resolved children of this node
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siblings: AnyNode[] // same kind, same parent (drives wall mitering)
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parent: AnyNode | null
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}
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```
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- **Shelf, spawn, item, column, fence segment** — builder reads only `node`. `ctx` argument unused.
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- **Wall** — `ctx.siblings` for corner mitering with adjacent walls. `ctx.children` for cutout footprints (doors / windows hosted on the wall).
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- **Door / window** — `ctx.parent` for parent-wall thickness, so the frame depth lines up with the wall it's cut into.
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`GeometryContext` exists so builders stay pure (no `useScene` import, no store mutation) and trivially unit-testable. The generic `<GeometrySystem>` builds `ctx` from the current scene snapshot once per dirty node; the cost is a few `Map.get` calls.
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For level-scoped batch data (wall mitering across an entire level), `ctx` can be extended with `ctx.levelData?.miters` in a future revision — decided alongside the wall migration (Phase 3 of the registry plan).
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## Choosing the right combination
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### `geometry` only
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Use this when the kind's meshes are a pure function of its node data. **Shelf, spawn, item, column, fence segment, wall, door (geometry side), window (geometry side).**
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```ts
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// packages/nodes/src/shelf/geometry.ts
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export function buildShelfGeometry(node: ShelfNode): Group {
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const group = new Group()
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group.add(buildTopBoard(node))
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group.add(buildBracket(node, -1))
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group.add(buildBracket(node, +1))
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return group
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}
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// packages/nodes/src/shelf/definition.ts
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export const shelfDefinition: NodeDefinition<typeof ShelfNode> = {
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// ...
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geometry: buildShelfGeometry,
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}
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```
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No renderer.tsx, no system.tsx. The generic renderer mounts an empty group, the generic system fills it.
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### `renderer` only (no `geometry`, no `system`)
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Use this when the kind composes its scene via JSX-only features and never needs imperative per-frame work. **GLB-backed items, kinds that mount drei helpers.**
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```tsx
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// packages/nodes/src/<kind>/renderer.tsx
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import { useGLTF } from '@react-three/drei'
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import { useRegistry } from '@pascal-app/core'
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import { useNodeEvents } from '@pascal-app/viewer'
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const FurnitureRenderer = ({ node }: { node: FurnitureNode }) => {
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const ref = useRef<Group>(null!)
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const { scene } = useGLTF(node.asset.url)
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const handlers = useNodeEvents(node, 'furniture')
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useRegistry(node.id, 'furniture', ref)
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return <primitive object={scene.clone()} ref={ref} {...handlers} />
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}
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```
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No `def.geometry` — geometry is the GLB. No `def.system` — there's nothing to animate.
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### `renderer` + `system` (no `geometry`)
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Use this when the kind's tree contains React-only primitives (e.g. `<Html>`) and needs per-frame imperative work that doesn't rebuild geometry. **Zone.**
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The renderer composes the tree once. The system pokes uniforms / opacity / transforms by name:
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```tsx
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// renderer.tsx
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<group ref={ref} {...handlers}>
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<Html name="label" position={centroid}>{node.name}</Html>
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<mesh name="floor" geometry={floorGeometry} material={floorMaterial} />
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<mesh name="walls" geometry={wallGeometry} material={wallMaterial} />
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</group>
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// system.tsx
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useFrame(() => {
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sceneRegistry.byType.zone.forEach((id) => {
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const group = sceneRegistry.nodes.get(id) as Group
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const walls = group.getObjectByName('walls') as Mesh
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const material = walls.material as MeshBasicNodeMaterial
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material.userData.uOpacity.value = lerp(currentOpacity, targetOpacity, lerpSpeed)
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})
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})
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```
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### `geometry` + `system`
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Use this when the kind has parametric geometry **and** extra responsibilities. **Door, window.**
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- `geometry` builds the visible meshes (frame, panels, hardware) as a pure function of node state + parent wall.
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- `system` advances animation (`operationState`), then calls `markDirty(node.id)` so the geometry system rebuilds on the next frame.
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This split keeps animation state outside the node schema (it's ephemeral — lives in `useInteractive`) while still re-using the generic rebuild path.
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## Named meshes work in either pattern
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Setting `mesh.name = 'walls'` is just a three.js property. A system targeting `getObjectByName('walls')` doesn't care whether the mesh was created in JSX (`<mesh name="walls" />`) or imperatively in a pure builder (`mesh.name = 'walls'; group.add(mesh)`). Use whichever fits the kind.
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## Migrating from custom renderer+system files to `def.geometry`
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If your kind's current system *only* rebuilds geometry on dirty (no animations, no cascades, no material poking), it can collapse to a single `def.geometry` function:
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1. Extract the imperative `updateXMesh(node, group)` from the system into a pure `buildXGeometry(node): Group` in `packages/nodes/src/<kind>/geometry.ts`.
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2. Replace `def.renderer` with nothing — the framework's `<ParametricNodeRenderer>` covers it.
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3. Replace `def.system` with `def.geometry: buildXGeometry`.
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4. Delete `renderer.tsx` and `system.tsx`.
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If the system also handles cascades, animations, or material updates, keep `def.system` and *also* set `def.geometry` — they run side by side.
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## Rules
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- **Builders must be pure.** No `useScene` import inside a `def.geometry` function. Read scene state via `ctx`. Mutating the store from a builder breaks idempotence.
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- **One mesh registered per node ID.** The generic renderer registers a single `<group>` per node. If a custom renderer mounts multiple meshes, register the parent group (or whichever object the system needs to address).
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- **Custom systems run in addition to the generic system, not instead of it.** A kind with `def.geometry` + `def.system` will see the generic system rebuild children on dirty AND the per-kind system run its `useFrame`. Plan priorities accordingly: door-animation runs at priority 2, geometry rebuild at priority 3.
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- **Dispose on rebuild.** The generic system disposes the previous children's geometry + material before swapping. Custom systems that imperatively add children must dispose what they replace, or accept the GPU-memory cost.
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- **`def.renderer` overrides the generic renderer.** Once you set it, you own the mount — `<ParametricNodeRenderer>` is not invoked. The generic geometry system still runs for the kind if `def.geometry` is set, so a custom renderer can register an empty group and let the system fill it.
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## See also
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- [renderers.md](renderers.md) — the legacy renderer pattern (still authoritative for kinds with custom `def.renderer`).
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- [systems.md](systems.md) — per-kind systems, frame-priority ordering, and core/viewer split.
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- [scene-registry.md](scene-registry.md) — how `sceneRegistry` indexes nodes by ID and type.
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- [Node registry plan](../../../plans/editor-node-registry.md) *(in private-editor)* — the multi-phase migration that produced this model.
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