https://mantis.zdoom.org/view.php?id=547
Summary
0000547: Walking enemies cannot leave steep slopes
Description
Enemies on a slope that is too steep to go up should be able to walk down the slope onto flat ground. They used to be able to do it but they can't any more. I'm not sure when this broke but the attached file allows the imps to walk off the slope in the last official ZDoom but not the final Git build (I know that doesn't really narrow it down much at all).
Steps To Reproduce
Load the attached demo and watch the behaviour of the imps. The cacodemon is there to show that flying enemies can cross the line at the slope bottom (so it's nothing to do with line flags) but walking enemies cannot.
Warp to map02 to see almost the same maps but the sloped sectors are set 1 unit lower. This is more like how things used to behave.
Additional Information
The slope in map01 is right on the border of what is climbable. The floors are set at 192 units high. The player cannot go up the slope and the imps cannot get off. The sloped sectors in map02 are lowered by 1 unit to 191. The player can go up and the imps can get off.
Also of passing interest, when the sloped sectors are at 192, the imps automatically slide down the slope when the map starts. Lowering the floors to 191 allows the imps to walk down the slopes at their own speed rather than being forced to slide down the slope. However, I *think* this is how things always behaved - other than in older versions when the enemies slid to the bottom of the slope, they slid right off instead of getting stuck at the bottom.
This attached file is a small section from my Burghead mod that relied on the enemies appearing on the slope, being able to come down it and ambush the player. I can modify the map if I need to but this strikes me as something that might affect other released mods too
https://mantis.zdoom.org/file_download. ... 8&type=bug