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started working on clipping planes, but for some reason pythreejs doesn't do what I'd expect from ThreeJS. Can't get the clipping to actually activate.

Meshes can be polygonal, they will get automatically triangulated before
rendering.
Face attributes for polygonal meshes are per polygon and are automatically
associated with the relevant triangles after triangulization.
Meshes with mixed face valence are supported.
See MixedValenceTest for an example.