VVIS

An optional compiling tool that sets the portals on your map. It determines what must be rendered in a certain area, allowing the game to ignore parts of the map, speeding up rendering. If this process is taking too long, be sure to read up on Controlling Geometry Visibility and Compile Times on how to reduce visleafs using func_details.

It is not recommended to leave out this process on any final maps, but it's okay to skip if you just want a quick look at how your level looks like.

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See Also:

VBSP

VRAD