Set maximum size exceeded

[RyugaRyuzaki]

• Based on the instructions here https://github.com/mrdoob/three.js/issues/21492#issuecomment-2029710683 -I configured the glb export function as follows

  async meshopt_compress(arrayBuffer: ArrayBuffer) {
  const before = performance.now();
  await MeshoptEncoder.ready;
  
  const io = new WebIO();
  io.registerExtensions(KHRONOS_EXTENSIONS);
  io.registerDependencies({
    'meshopt.encoder': MeshoptEncoder
  });
  
  const doc = await io.readBinary(new Uint8Array(arrayBuffer)); // read GLB from ArrayBuffer
  // we have to remove weld and simplify it will throw error with large model
  await doc.transform(
    weld({tolerance: 0.0001}),
    simplify({simplifier: MeshoptSimplifier, ratio: 0.75, error: 0.001}),
    reorder({encoder: MeshoptEncoder}),
    quantize(),
    sequence()
  );
  
  doc.createExtension(EXTMeshoptCompression).setRequired(true).setEncoderOptions({
    method: EXTMeshoptCompression.EncoderMethod.FILTER // or EXTMeshoptCompression.EncoderMethod.QUANTIZE
  });
  io.registerExtensions([EXTMeshoptCompression]); // read instanced meshes
  const compressedArrayBuffer = await io.writeBinary(doc);
  console.log(`Compression in ${(performance.now() - before) / 1000}s`);
  return compressedArrayBuffer;
  }

• And then I got this error when I was trying to export a large model

[donmccurdy]

On the v4 alpha release, this has been fixed with a fast path for weld tolerance=0. I'd recommend tolerance=0 for most use cases starting with v4, where it will be the default.

To install the alpha release:

npm install --save @gltf-transform/core@next @gltf-transform/extensions@next @gltf-transform/functions@next

Also note the reorder, quantize, and meshopt steps can all be combined into one:

await doc.transform(
      weld(),
      simplify({simplifier: MeshoptSimplifier, ratio: 0.75, error: 0.001}),
      meshopt({encoder: MeshoptEncoder, level: 'high'}),
      sequence()
);

Then explicitly calling doc.createExtension(EXTMeshoptCompression) is not required.