Appendix C: Common Textures
From Mod Wiki
|A structural and invisible shader. Used to create the structural 'hull' of the BSP.||Standard Clip brush which will block players.|
No bullets or projectiles are blocked.
|Forces additional portals in the BSP.||Based on the standard clip brush. Blocks all projectiles.|
|Allows players to climb up or down. Acts like player clip. It must be present on all sides of the brush.||Based on standard clip brush. Blocks all projectiles and produces a metal sound when hit by bullets.|
|Defines a volume where the lightgrid is active. Any space outside is not calculated.||Based on standard clip brush. Blocks all projectiles and produces a wood sound when hit by bullets.|
|Does not draw in game and is non solid. Used for single sided brushwork like alpha channel textures.||Terrain metashader with grass step sound.|
|Used by brushwork entities for defining their origin point in the map.||Terrain metashader with gravel step sound.|
|Skip is a nonsolid, invisible, structural shader that does not create BSP splits or portals. Used in conjunction with antiportals or hint faces.||Terrain metashader with snow step sound.|
|Used on brushwork trigger entities. It's not drawn and is not solid.|
Please note that this is not a complete list of texture/shaders from the common directory but a summary of the most useful ones for producing a map for Enemy Territory.