Commits on Nov 16, 2023

1. gltfpack: Remove normal streams from meshes with unlit materials …

   Unlit materials do not require normals or tangents; we already
   automatically filter out tangents because of the lack of normal texture
   or other material extensions, but normals were not removed until now.
   
   This can reduce the amount of geometry we need to output; this also
   mostly subsumes the redundant normal stream filtering for point clouds
   as point clouds often have an unlit material, but for now we'll keep
   that redundancy.
   
   When material variants are used, we only do this when all material
   variants for a given mesh are unlit. The use of the default material
   also blocks this optimization as default material implies basic
   lighting.

   

   zeux committed Nov 16, 2023
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