[1.0.21]Slopes + 3dfloors.

[chopkinsca]

I've attached a map which shows the bug more better than I can explain it. When you start, the ledge you see is made up of a 3d floor. Walk into the edges of the ledge and you should notice something that isn't what you expect to happen. In this case, you can walk through part of the 3d floor.

[Graf Zahl]

Don't mess around with slopes and 3D floors next to each other. Doom's movement code - particularly the sliding code - is far too unstable to handle that well. I can try but most likely I won't be able to fix this.

[chopkinsca]

Alright, I thought that was the case, but posted it just to be sure. I already fixed up the area where I had it happen.