This article is quite detailed and is taking time to write - check back in a few days. This is just a place holder for now.
Why and How?
Write up the guide for these images and move to the VP article or a new one: [Image:Vismapgrid.png] [Image:Map3d.png] [Image:Areascut.png] [Image:Visportaled.png] [Image:Visportals.png] [Image:1to3check.png] [Image:1to3check2.png] [Image:2to4check.png] [Image:Fovcut.png]
Visportaling Simple Corners
Height Seperated Visportals
Understanding Special Materials and Entities