Sometimes fails to climb steps at slow speeds

[Skaruts]

When going at lower speeds the stepping code sometimes fails to climb steps. I tried to play around with the code, but I can't think of a way to fix this.

I first noticed this issue when I lowered the speed of my controller and added a key to walk even slower (for stealth). When walking slowly up the stairs, sometimes it failed to climb some steps. But there are other ways to replicate the issue without changing the controller's speed. I recorded a couple gifs to illustrate them (ignore all the z-fighting of the collision shapes).

Here I'm strafing left into the wall (not pressing forward). This reduces the speed, and I end up bumping into the step instead of climbing it (I made some gizmos for the velocity vector and the collision normal).

The same problem happens when approaching stairs from subtle angles, like below (you can see how the velocity vector changes):

---

This may or may not be related to it being unable to climb 1-unit steps (in my case 1 unit == 1/48 -- I'm using 48 as my "inverse scale factor" in the map importer plugin). May be worth keeping in mind, just in case.

In the gif, it climbs up to the second step and gets stuck. For some odd reason, it climbs a few more steps when I release the forward key.

[mrezai]

All the problems related to these:

• This implementation uses collision normal but for more robust implementation we need surface normal, and surface normal doesn't exposed in Godot Physics interface. See this proposal for more information.
• Margin in Jolt Physics rounds the edges of convex shapes. See this issue for more information.

[Skaruts]

Seems like the first case where I strafed into the wall is actually not related to slow speeds. I tested it with the original controller code, and it also happens at high speeds.

I'm only pressing forward here, and it's only when I turn the mouse away from the wall that it climbs the step. It seems like it fails whenever the main_velocity is pointing toward the wall.

[mrezai]

Convert all collisions from convex to trimesh, maybe that could help.

[Skaruts]

I don't think I have any control over that, as I'm using a map importer plugin. EDIT: actually, the importer does have an option for this, but... the issue is still there, and it's not even any better.

I made a quick map out of MeshIntances with trimesh collisions and it does make a difference, but it's still not 100%. I still got it stuck a few times.

I'm confused about why convex collisions make it fail, though. (I haven't dug into the links you gave me yet, so maybe I should.)