3D Character Controller choppy/stuck on kinematic rigidbodies

[ManevilleF]

Closed by #625

I'm using the same setup as the 3d character controller example I made with one difference:

The ground cube has a Rigidbody::KinematicPositionBased component (line 74).

 commands.spawn((
        Transform::from_xyz(0.0, -ground_height, 0.0),
        Collider::cuboid(ground_size, ground_height, ground_size),
+        RigidBody::KinematicPositionBased,
    ));

Suddenly the player controller very choppy, getting stuck randomly on the ground, even though it's not moving.

I tried making a "Ground" and "Player" group and disable contact forces via SolverGroups without success.

I think this is a regression, as this setup used to work in previous versions. The only issue back then was that the character controller could get stuck on walls, but not on the ground.

[Vrixyz]

Thanks for the report!

• I could reproduce it on master, but on Update rapier to 0.23 #625 this seems resolved, I'm not sure what would be the origin of that behaviour.

• Add shapecast example + loosen gjk epsilon parry#298 may be related, too.

There has been a few changes to ground detection and small tweaks to collision detection upstream, which are probably at the root cause, but if #625 offers a satisfying fix, I'm putting this on my low priority list. I'm still interested in more details if anyone looks into it :)

[ManevilleF]

After testing on your branch, I can confirm that #625 seems to resolve the issue