%CompileFog

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%compilefog is a VMT parameter used by tools/toolsfog. This flag is not read by VBSP, and as such has no effect. It may be leftover from earlier in Half-Life 2's development. Judging by comments and ifdefs in VRAD's source code, it may have been used to create fog volumes which are baked into the level geometry instead of built at runtime using env_fog_controller or fog_volume.