Material
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GoldSrc does not use materials; instead, textures are used directly, and flagged either via name in a WAD or by metadata in an MDL or SPR. Information about a texture's "material" is instead stored in materials.txt and MAT files.
Risk of Confusion:This page is for the concept of materials in general. More information about materials in specific engines can be found on the documentation about the specific engines' material format pages.