Ask HN: Simple 3D animation file format?

[kaveh808]

File formats such as FBX and USD attempt to do everything and as a result are quite complicated.

Is there a layered 3D/animation interchange format that allows for relatively painless scene interchange between 3D apps?

By layered I mean something where each feature builds on the previous features. Something like:

1) OBJ-like static geometry

2) materials and lighting

3) per-frame transform matrices

4) animation curves

5) etc.

[brlcad]

I've found glTF ( https://www.khronos.org/gltf/ ) to be quite simple. The entire format is encompassed in something like a dozen entity types. Nice visual overview here: https://github.com/KhronosGroup/glTF/blob/main/specification...