Nelsona wrote:It was observation, also I read what was written by Hook "never Subtract from subtract and never add into an add". Probably those solid ramps need intersected with a semisolid and neither to have a common surface. If are 2 brushes with the same surface and textured different, which one is rendered ? I think causes that blur effect as AncAqua where portal surface was the same with a stair generating a bad surface. Recall that KingJosh's map is much bigger but it might be rendered without nasty effects.
What Hook is saying both true and false. Subtracting the subtract and adding the adjective can cause bsp problems. But in order to make something that needs to be that way doesn't hurt at all. Just in this case - a.i. has the trouble with it.
For a example that disproves Hooks theory- a pool with an underwater way that lets you go around or through the map, for example DM-ArcaneTemple and DM-Pressure.
Subtracting the subtract

Official epic maps. Maybe it is the complexity of the actual brush that is being subtracted that depends the results. No one can tell actually.
Some people said, when I brought out my first preview version of CM4, that the roof in the control room is one big gap, void, then other say there isn't any problem at all.
Normal engine behaviour.

Some parts in the temple in are still displaying BSP cuts, but it depends on the very rebuild. First the rebuild is ok, no problems, no bsp cuts. Second rebuild everything displays bsp cuts without touching any geometry. Normal engine behaviour.
I've been making maps over 10 years now, don't teach me how to make a map

. But I understand your concern and thoughts
