Decal Last edited 1 month ago2022-06-26 11:49:42 UTC

A special texture that can be added to a textured brush to give signage to the brush or variety to the texture tiling.

They are usually, a 256-colour greyscale that is stored in "decals.wad" file. Custom decals to be added to the map should be placed in a custom WAD file with a program like Wally and then be merged into the final .bsp file with the CSG compiler's -wadinclude parameter.
Check out SlayerA's tutorial on Decals for more info.

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