Failing on glTF with meshopt fallback buffer

[lilleyse]

I'm trying to validate a tileset with .gltf files that use EXT_meshopt_compression and it fails when it encounters a meshopt fallback buffer which doesn't have a URI.

[javagl]

This actually stems from some of the underlying, fundamental classes in the 3d-tiles-tools that did not properly handle that case of "fallback buffers" that may appear in EXT_meshopt_compression. (This is a bit obscure, and I'll have to read/check this more thoroughly).

A draft for fixing this is at CesiumGS/3d-tiles-tools#160