@ifc-lite/pointcloud

Renderer-agnostic point cloud decoders for ifc-lite. Phase 0 covers the three IFCx pointcloud schemas authored by buildingSMART:

• pcd::base64 — full PCD file (PCL format) embedded as base64. Supports ASCII, binary, and LZF-compressed binary_compressed payloads.
• points::array — inline JSON { positions: number[][], colors?: number[][] }.
• points::base64 — { positions: base64-Float32, colors?: base64-Float32 }.

import { decodeIfcxPointAttribute } from '@ifc-lite/pointcloud';

const chunk = decodeIfcxPointAttribute(node.attributes);
if (chunk) {
  console.log(`${chunk.pointCount} points`, chunk.bbox);
  // chunk.positions, chunk.colors are ready for GPU upload
}

The renderer (@ifc-lite/renderer) consumes DecodedPointChunk values via Renderer.loadPointClouds() / Renderer.addPointCloudChunks().

Streaming decode worker (zero Vite config)

For streaming sources (.las, .laz, .ply, .pcd, .e57, .pts, .xyz) the decoder runs in a dedicated Web Worker so the main thread stays responsive. The worker is inlined into the published package as a Blob-URL — consumers don't need to set worker.format: 'es' or add the package to optimizeDeps.exclude in their Vite config.

import { createDecodeWorkerSource } from '@ifc-lite/pointcloud';

const source = createDecodeWorkerSource({ format: 'las', blob: file });
const info = await source.open();
// drive source.next(maxPoints) → DecodedPointChunk until it returns null

Notes:

• The inlined worker bundle is lazy-loaded — consumers that only call decodeIfcxPointAttribute (the non-worker decoder) don't pay the bytes.
• LAZ decoding (format: 'laz') pulls in laz-perf's wasm at runtime via new URL(..., import.meta.url), which doesn't resolve from inside a Blob-URL worker. If you need LAZ from the published package, pass a custom spawn callback that yields a worker capable of fetching the wasm (see DecodeWorkerOptions.spawn).
• Strict CSPs need script-src 'self' blob: to allow the Blob-URL worker.

License

MPL-2.0