@plasius/gpu-cloth

Continuity-aware cloth simulation and rendering contracts for Plasius WebGPU stacks.

Apache-2.0. ESM + CJS builds. TypeScript types included.

Install

npm install @plasius/gpu-cloth

Browser Demo

npm run demo

Then open http://localhost:8000/gpu-cloth/demo/.

npm run demo now serves a browser-based 3D harbor validation scene from @plasius/gpu-shared, focused on cloth continuity. The existing console example remains available via npm run demo:example.

What It Solves

• Defines near, mid, far, and horizon cloth representation bands.
• Preserves silhouette, broad motion, and pinned-anchor continuity so garments do not pop or collapse when range selection changes.
• Separates stable physics snapshot inputs from derived visual cloth state.
• Emits worker-manifest DAGs compatible with @plasius/gpu-worker.
• Emits performance metadata compatible with @plasius/gpu-performance.
• Keeps the first package slice focused on contracts, planning, and integration surfaces rather than pretending to ship a full solver on day one.

Usage

import {
  createClothRepresentationPlan,
  createClothSimulationPlan,
  getClothWorkerManifest,
  selectClothRepresentationBand,
} from "@plasius/gpu-cloth";

const representationPlan = createClothRepresentationPlan({
  garmentId: "hero-cape",
  kind: "cape",
  profile: "interactive",
  supportsRayTracing: true,
  nearFieldMaxMeters: 18,
  midFieldMaxMeters: 55,
  farFieldMaxMeters: 180,
});

const activeBand = selectClothRepresentationBand(32, representationPlan.thresholds);
const activeRepresentation = representationPlan.representations.find(
  (entry) => entry.band === activeBand
);

console.log(activeBand, activeRepresentation?.continuity);

const simulationPlan = createClothSimulationPlan("interactive");
const workerManifest = getClothWorkerManifest("interactive");

console.log(simulationPlan.snapshotSource.stage, workerManifest.jobs.length);

Continuity Model

Cloth bands share a continuity group and motion field identity. Each band retains a non-zero silhouette floor and broad-motion floor from the same shared source so the garment still reads as the same object when the view changes:

• near: full live simulation, highest mesh density, highest update rate
• mid: reduced live simulation, lower wrinkle detail, same broad motion
• far: pose or sway proxy, same silhouette and pinned-anchor identity
• horizon: silhouette impression with retained directional motion

The continuity model is designed so the visual answer changes in fidelity, not in whether the cloth still appears attached, moving, or present.

Worker and Performance Integration

The package emits multi-root DAG manifests rather than flat FIFO job lists.

Typical roots:

• snapshot-ingest
• wind-field-advance

Typical downstream joins:

• near-cloth depends on both the stable physics snapshot and the current cloth solve state
• wrinkle-history depends on both near-cloth and mid-cloth

Each job carries:

• worker queue metadata for @plasius/gpu-worker
• performance levels and ray-tracing-first metadata for @plasius/gpu-performance
• debug metadata suitable for future @plasius/gpu-debug adoption

Package Scope

@plasius/gpu-cloth currently provides:

• cloth representation-band planning
• continuity envelope generation
• stable snapshot and scene-preparation planning
• worker-manifest and budget-contract generation

It does not yet provide:

• a production cloth solver
• actual GPU kernels
• renderer pass execution
• debug transport or analytics delivery

Development

npm ci
npm run lint
npm run typecheck
npm test
npm run build