![]() For example, the definition for a material might specify RGB values for the material's diffuse, ambient, and specular reflectivity, along with other characteristics such as index of refraction and transparency. The MTL file is a "library" that can contain one or more named material definitions, each of which can specify color, texture, and reflection characteristics. ![]() The ASCII-based MTL file describes surface appearance properties to be applied to polygonal facets or freeform curved patches defined in an OBJ file. Like the OBJ format, the MTL format was used and documented by Wavefront Technologies in the 1990s in association with its Advanced Visualizer software. The Wavefront Material Template Library (MTL) file is a companion file for one or more Wavefront OBJ files. Wavefront Material Template Library (MTL) File Format
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