Before, neither the texture index nor its semantic were kept in the
returned output. Now GetMaterialProperties returns a (name, color,
material, texture) tuple. Name is the name of the material. Color is a
dictionary of color properties. Material is a dictionary of material
properties. Textures is a triply nested dictionary addressed by the
following: textures[index][semantic][key]. See assimp documentation for
the meaning of index, semantic, and keys in general.
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