Materials.txt

sounds/materials.txt is a text file used in GoldSrc to dictate what sounds are made when stepping on certain textures.

The system operates through a single file called “valve/sound/materials.txt” found within the primary installation folder of the Half-Life game. This file contains a series of lines that assign texture names to corresponding material types using a one-letter code. For example, the letter ‘V’ represents ventillation, ‘D’ represents dirt, ‘M’ represents metal, and so on:

// Half-Life Texture Types.  Modify this file only if texture names are changed!
//  'M' metal, 'V' ventillation, 'D' dirt, 'S' slosh liquid 
//  'T' tile, 'G' grate (Concrete is the default), 'W' wood, 'P' computer, 'Y' glass

V SILO2_COR
D OUT_GRVL1
M SILO2_P2

By specifying the appropriate texture name in the file, the corresponding material type will be used for the associated surface. If a texture is not defined in the file, the default concrete sounds will be applied. It is important to note that this file is universal and affects all texture names used in any map within the game mod. Additionally, it cannot be overridden with custom entries specific to individual maps.