%CompileNoLight

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 for LightmappedGeneric where you need to use some parameters that UnlitGeneric lacks.

Syntax

   %compileNoLight                         1

Tip:In 's VertexLitGeneric, a similar effect can be applied on models by assigning vgui/white to $lightmap.