GLTFExporter GLTFLoader and InstancedBufferGeometries

donmccurdy · July 2, 2019, 4:13pm

Here’s a snippet I’ve used before to convert a model loaded from GLTFLoader into an InstancedBufferGeometry –

donmccurdy/three-shadenodeloader/blob/9086f85eda800424d6cd446b5412e98ed97591b4/index.html#L307-L322


function makeInstances ( geometry, material ) {


  const instanceCount = material.userData.instanceCount;


  const instanceID = new THREE.InstancedBufferAttribute(
    new Float32Array( new Array( instanceCount ).fill( 0 ).map( ( _, index ) => index ) ),
    1
  );


  geometry = new THREE.InstancedBufferGeometry().copy( geometry );
  geometry.addAttribute( 'instanceID', instanceID );
  geometry.maxInstancedCount = instanceCount;


  return geometry;


}

But to export you’d need to undo that. If you use multiple copies of the same BufferGeometry, GLTFExporter should be smart enough to export only one copy and reuse it, but the file format doesn’t have a GPU instancing feature as such, and InstancedBufferGeometry can’t be exported directly.

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GLTFExporter GLTFLoader and InstancedBufferGeometries

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