Mat wireframe
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Mat_wireframe is a console command. It will render wireframe over the normal in-game rendering. This shows how brush faces are being chopped. The wireframe will also render for objects that are blocked by other objects, which can help with visibility optimization.
Mat_wireframe is a cheat.

mat_wireframe set to 1. Note the tree is being drawn by the engine even though it is behind the wall. This is an example of visibility issues.