Draco compression may produce an UNSIGNED_SHORT index buffer with vertex count > 65535 about gltf-transform HOT 3 CLOSED

Yikes, thanks for reporting this! Likely related to:

• #1343
• google/draco#326

A design goal of glTF Transform is that the document being exported shouldn't change during export, but Draco compression seems to throw a few wrinkles into that plan. More investigation needed.

from gltf-transform.

@donmccurdy thanks for your attention!

If I understand correctly, Draco may increase the number of vertices, it's pretty expected behavior, but the model just saves with incorrect componentType. As a workaround I just change the componentType from 5123 to 5125 and the patched model are correctly loaded by all renderers.

Of course, this trick is possible just with such "lazy" accessors whose data is populated after decompression.

from gltf-transform.

Thanks @allcreater! This should be fixed shortly with:

• #1388

from gltf-transform.