CompileNoLight
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When this parameter is added to materials, it will tell VRAD to not compile a Lightmap page for that material, which saves compile time. Valve introduced this parameter with Alien Swarm, using it with tools/toolsnolight.vmt, the black areas you see in the levels.
Note:This parameter is also available in Source 2013.
Useful if you need features from shaders such as LightmappedGeneric or LightmappedReflective which are not present in UnlitGeneric.
Syntax
%compileNoLight 1