I've been trying for a while, and even though it sometimes work, nine out of ten times, the LDR cubes will not be produced. What I need is a checklist for building cubemaps in HDR and LDR mode. This is what I have at the moment: Code: *load game/level* (Starting in default HDR mode) mat_specular 0 buildcubemaps *exit game completey* *load again* mat_specular 0 mat_hdr_level 0 mat_hdr_enabled 0 (This produces a red text saying "HDR Enabled". Maybe the flaw is here?) buildcubemaps Still, when HDR should be disabled, which also is evident just by looking at bright places in the level, the build program builds the HDR version of the cubemaps.