mtl
What is a .mtl file?
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An MTL file (.mtl, Material Template Library) is the companion to a Wavefront OBJ — a plain-text list of named materials with colours, specular/opacity values, and texture-map references. The OBJ links to it via an mtllib line.
How to use a .mtl file
Use an example .mtl file to test OBJ material parsing, texture-map resolution, and OBJ+MTL import pipelines.