GLTFExporter: How to export a gltf/glb with multiple root level scenes

Questions
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1

Is it currently possible to export multiple scenes using GLTFExporter.parse without wrapping all of the scenes inside of another one? I would like to export these scenes so that when the model is imported with GLTFLoader, they are accessible through the scenes attribute, instead of having all scenes wrapped into a single scene under the scene attribute. I figure I might have to dig around with parse and make some customizations, since it appears that the above behavior was intended to cover this edge case.

2

This isn’t currently supported by GLTFExporter. If you’ve exported them to multiple GLBs you could merge them offline to create one file with multiple scenes:

gltf-transform merge a.glb b.glb c.glb output.glb
3

@donmccurdy Is there a client side merge utility?

4

Yes, the document.merge(other) method. If you’re writing the result into a GLB you’d also want to remove all but one buffer in the final document:

const buffer = document.getRoot().listBuffers()[0];
document.getRoot()
	.listAccessors()
	.forEach((a) => a.setBuffer(buffer));
document.getRoot()
	.listBuffers()
	.forEach((b, index) => (index > 0 ? b.dispose() : null));