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Ghost collisions with CharacterBody3D (CylinderShape3D) against StaticBody3D (ConcavePolygonShape3D)
Tested versions
Reproducible in v4.2.1.stable.mono.official [b09f793f5]
System information
Godot v4.2.1.stable.mono - Windows 10.0.19045 - Vulkan (Forward+) - dedicated AMD Radeon (TM) R9 390 Series (Advanced Micro Devices, Inc.; 27.20.20913.2000) - Intel(R) Core(TM) i5-4430 CPU @ 3.00GHz (4 Threads)
Issue description
When a CharacterBody3D with CylinderShape3D collides against particular triangles on a StaticBody3D with ConcavePolygonShape3D, the collision results after invoking MoveAndSlide() and GetSlideCollision() are sometimes extremely incorrect.
The reproduction project includes an example of a CharacterBody3D on the edge of a StaticBody3D, moving only very slightly into it, which causes an extreme shift (The collision has a depth of .244, despite the cylinder only having a radius of .25. This becomes significantly more problematic if collision response is used to control character velocity)
Steps to reproduce
Run the example project. The CharacterBody3D is moving into the StaticBody3D at a very low speed, but the collision depth+normal pushes it extremely far to the left, as displayed through the console logs.
Minimal reproduction project (MRP)
I'm experiencing the same issue. I'm wondering if converting my concave mesh into multiple convex meshes but I'm concerned that might bring about other problems at the seems. Has anyone tried this yet?
I saw the fix in 4.4 beta 4 (https://github.com/godotengine/godot/pull/102614), and upgraded because I thought it might help but no dice. Did 4.4 RC 1 have a fix I missed?
@sanform Did you enable Jolt Physics explicitly in the Project Settings? It's not the default option in 4.4.
Otherwise no there's no additional physics related change in 4.4.rc1 compared to 4.4.beta4.
This issue has been frustrating to me. I have a super monkey ball type game and the ball collides with every seem connecting triangles which is especially apparent when the ball has less momentum. This occurs on Jolt also.
This issue has been frustrating to me. I have a super monkey ball type game and the ball collides with every seem connecting triangles which is especially apparent when the ball has less momentum. This occurs on Jolt also.
This is a separate issue, which would require something like https://github.com/godotengine/godot/pull/102662 to be implemented in GridMap to be fixed.
This issue has been frustrating to me. I have a super monkey ball type game and the ball collides with every seem connecting triangles which is especially apparent when the ball has less momentum. This occurs on Jolt also.
This is a separate issue, which would require something like #102662 to be implemented in GridMap to be fixed.
So should I make a separate bug report for it?
So should I make a separate bug report for it?
There's already an issue for it:
- https://github.com/godotengine/godot/issues/46712