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DP GFX EXTERNALTEXTURES PERMAPTEXTURES
From Quake Wiki
Q1BSP and HLBSP map loading loads external textures found in textures/<mapname>/ as well as textures/.
Where mapname is the bsp filename minus the extension (typically .bsp) and minus maps/ if it is in maps/ (any other path is not removed) For example:
- maps/e1m1.bsp uses textures in the directory textures/e1m1/ and falls back to textures/
- maps/b_batt0.bsp uses textures in the directory textures/b_batt0.bsp and falls back to textures/
As a more extreme example:
- progs/something/blah.bsp uses textures in the directory textures/progs/something/blah/ and falls back to textures/