Func viscluster

func_viscluster is a VVIS-optimising internal brush entity available in the Orange Box engine. It allows you to manually tell VVIS that the leaves inside its volume can all see each other, which is useful in large open areas where visibility calculations would otherwise take a very, very long time to complete. It should be textured with tools\toolstrigger.

This entity does not change the location or number of leaves. See Visibility optimization to improve performance!

Warning:The brush should not cross the surface of water. If it needs to, create a second, separate entity on the other side.