0000247: Enemies can't cross steep slopes under 3D floors - ZDoom

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ID	Project	Category	View Status	Date Submitted	Last Update

0000247	Gameplay + OpenGL	[All Projects] Bug	public	2017-02-11 16:43	2017-02-15 10:49

Reporter	Enjay
Assigned To
Priority	normal	Severity	minor	Reproducibility	have not tried
Status	resolved	Resolution	fixed

Summary	0000247: Enemies can't cross steep slopes under 3D floors
Description	I think I've narrowed down the conditions that create this situation... If an an enemy is trying to cross a 3D floor with a steep slope under it, the enemy will refuse to cross; even if the slopes are pretty small. Tested in GZDoom 2.3.2 and a Git build from 11 Feb. This represents a change in behaviour: the attached map behaves differently in ZDoom.
Steps To Reproduce	Load the attached map. There is a shallow trench in the middle of the first room and a translucent 3D floor fills it so that the top of the 3D floor is the same as the room floor (height value 0). This should allow enemies to cross but they don't. I have managed to recreate this reliably in some real maps with similar setups. The trench is only 16 units deep but has a 45 degree slope (from -16 to -8) at the edge. The next room is almost the same but the slopes have had their floor height lowered to -12 so that the gradient is now less than 45 degrees. The enemies in this room will walk across the 3D floor. In ZDoom enemies will walk across the 3D floor in both rooms. Removing the 3D floor makes the enemies in ZDoom behave the same as in GZDoom; i.e. in both ports the enemies don't go into the trench in the first room but they do in the second room. So, it would appear that the enemies in GZDoom are behaving as if the 3D floor was not providing a bridge over the slopes for them.
Tags	No tags attached.

Enjay 2017-02-11 16:43 reporter	FloorTest.zip (2,578 bytes)

Graf Zahl 2017-02-12 18:57 administrator ~0000537	Welcome to the mess of Doom's movement code. :( I hope this can be fixed.

Graf Zahl 2017-02-15 05:47 administrator ~0000598	You keep saying 'in ZDoom'. Which version? 2.8.1 or some devbuild?

Enjay 2017-02-15 10:49 reporter ~0000604	Sorry, I should have been clear. ZDoom 2.8.1 I know it's old but I'm sort of using it as a baseline for the last official build before the recent major changes started.

Date Modified	Username	Field	Change
2017-02-11 16:43	Enjay	New Issue
2017-02-11 16:43	Enjay	File Added: FloorTest.zip
2017-02-12 18:57	Graf Zahl	Note Added: 0000537
2017-02-15 05:47	Graf Zahl	Note Added: 0000598
2017-02-15 06:15	Graf Zahl	Status	new => resolved
2017-02-15 06:15	Graf Zahl	Resolution	open => fixed
2017-02-15 10:49	Enjay	Note Added: 0000604