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Add this VMT parameter to make brushes non-solid. When compiling the map, VBSP will flag the brush with this material as non-solid. Useful for foliage or light effects.
Unlike a brush tied to a func_illusionary, a worldspawn (or func_detail) brush with %CompileNonSolid does not count as an edict.
Important:All faces of the brush must be textured with a nonsolid material for the brush to be nonsolid.
Tip:Use toolsblocklight as a nodraw texture for nonsolid brushes (counts as detail), or create a duplicate of toolsnodraw with %CompileNonSolid (naming it something like toolsnoclip).
Bug:
Left 4 Dead 2 The material will be invisible if used on a brush with solid contents.