http://emptyset.endoftheinternet.org/~p ... bined.diff
http://emptyset.endoftheinternet.org/~p ... 080108.zip
Please apply this patch to your q3map2, and compile a map that with current q3map2 gets holes in the terrain. Also, try changing the misc_model spawnflags from 6 to 22. It looks like this patch actually fixes the big bug with models in maps, but I want it to be tested before I send it to the q3map2 guys.
The bug was that planes are snapped to axial planes when possible (otherwise, it creates too many planes) - however, the snap routine rotated the plane around the ORIGIN to change the normals. So the 0.25 degrees snap angle it allowed could become so much that it even destroyed brushes.
I modified the snapping routine so it ensures that a point of a triangle stays on the plane when it is rotated.