Func viscluster/en
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![](/w/images/thumb/7/7d/Tools_Viscluster.png/160px-Tools_Viscluster.png)
tools\tools_viscluster from
Black Mesa, a custom trigger texture designed to make it easy to identify visclusters.
![Black Mesa](/w/images/thumb/3/31/Bms_icon.png/16px-Bms_icon.png)
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 tools\toolstrigger.
![Note.png](/w/images/thumb/c/cc/Note.png/10px-Note.png)
![Note.png](/w/images/thumb/c/cc/Note.png/10px-Note.png)
mat_leafvis
show the leafs to still be intact.![Warning.png](/w/images/thumb/c/cb/Warning.png/10px-Warning.png)
func_viscluster
on the other side. Never allow a func_viscluster brush to cross a water plane, or very strange things happen.