What is the difference between Rebuilding the Geometry and Rebuilding the BSP?
Rebuilding the geometry is just that. The 3d view doesn’t keep track of moving or deleting of brushes. By just Rebuilding the geometry you can very quickly get a good look at what you’ve changed in the 3d view. Kind of think of the 3d view as a compiled view of the map. BSP on the other hand a BSP can help remove BSP holes (talked about later) and if you haven’t Rebuilt the BSP lately can speed up the 3d view a little. Essentially though what it does is keeps a list of what polys to draw and what not to.
