Sven Co-op Entity Guide

Material sounds
  Generic information

Usually, when you wanted custom textures to use specific material sounds (for step- and hit-sounds) you'd have to replace a texture from halflife.wad with your own to get the material attribute according to materials.txt, or override material type using func_breakable material type. Since Sven Co-op 4.5, you can specify materials on your own textures using one of the following 12-character-prefixes: