I am wondering how BabylonJS is handling draco compressed GLTF Files. There seems to be an issue with vertex colors. I have been compressing my GLTF file with gltf-pipeline and the result is viewable in gltf-viewer by donmccurdy, but not in babylonjs. Vertex Colors are enabled on the mesh in babylon. Vertex Alpha is not enabled by default, but changing it, does not make a difference.
If you want to try out the file, you can download the zip containing the draco compressed Example.glb and the uncompressed ExampleCompressed.glb Example.zip (274.3 KB)