View source for Func viscluster

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{{this is a|brush entity|internal=1|name=func_viscluster|since=Source 2007|sprite=toolstrigger.gif}}
[[File:Tools Viscluster.png|thumb|160px|{{mono|tools\tools_viscluster}} from {{bms|4}}, a custom trigger texture designed to make it easy to identify visclusters.]]
It allows you to manually tell [[VVIS]] that the [[visleafs]] inside its volume can all see each other and should be treated as one. This is useful in large open areas where visibility calculations would otherwise take a very, ''very'' long time to complete. Poor use may be [[expensive]] for in-game performance. It should be textured with a [[trigger]] texture, such as <tt>tools\toolstrigger</tt>.

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{{note|This entity does ''not actually'' change the location or number of leafs in a map. Hammer's [[portal file]] ''says'' this occurs, but commands such as {{ent|mat_leafvis}} show the leafs to still be intact.}}

{{warning|The brush should not cross the surface of a [[Water (shader)|water material]] or an [[areaportal]]. If it really does need to be used over water, bring the brush level with the surface of the water on one side, and then create a second, separate <code>func_viscluster</code> on the other side. Never allow a <tt>func_viscluster</tt> brush to cross a water plane, or ''very'' strange things happen.}}
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==See also== 
*[http://www.youtube.com/watch?v=TzUBDMuVQmA Viscluster video tutorial]
*[[Visibility optimization]]
[[Category:Optimization Brush Entities]]