Introduction
The Material Template Library format (MTL) is a standard defined by Wavefront Technologies for ASCII files that define the light reflecting properties of a surface for the purposes of computer rendering, and according to the Phong reflection model. The standard has widespread support among different computer software packages, making it a useful format for interchange of materials.
MTL files are commonly accompanied by and referenced from OBJ files that define geometry upon which the materials of the MTL file are mapped.
The MTL format, although still widely used, is outdated and does not fully support later technologies such as specular maps and parallax maps. However due to the open and intuitive nature of the format, these can easily be added with a custom MTL file generator.
The MTL format defines a number of formats.
Read more about this topic: Wavefront .obj File, Material Template Library
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