Improve slope physics on solid middle textures
Merge after !2454 (merged).
Slope physics are incorrect on solid middle textures because they use the physics of the sector's slopes, rather than the (expected) physics of the line.
Before:
After:
Merge after !2454 (merged).
Slope physics are incorrect on solid middle textures because they use the physics of the sector's slopes, rather than the (expected) physics of the line.
Before:
After: