CSGPolygon in mode Path makes RigidBody bounce

[ghost]

Godot version

3.4.2.stable

System information

Windows 11, GLES3, Intel® Iris® Xe Graphics

Issue description

CSGPolygon in mode Path and with generated Collision makes a RigidBody unexpectedly bounce.

Incorrect.mp4

CSGPolygon in mode Depth and with generated Collision makes a RigidBody correctly smoothly move.

Correct.mp4

Bug does not happen to KinematicBody.

Steps to reproduce

• Add Node: Path
• Add Points to Path
• Add Node: CSGPolygon
• Set CSGPolygon Property:
  • Mode: Path
  • Assign: Path
  • Use Collision: On
• Add Node: RigidBody
• Set RigidBody Property:
  • Mode: Character
• Add Node to RigidBody: CollisionShape
• Set CollisionShape Property:
  • Shape: New BoxShape
• Add Node to RigidBody: MeshInstance
• Set MeshInstance Property:
  • Shape: New BoxShape
• Add Script to RigidBody

extends RigidBody

func _integrate_forces(state):
	apply_central_impulse(Vector3.FORWARD / 4)

Minimal reproduction project

Bug.zip

[Calinou]

Related to #50463. This is likely a duplicate of that issue, unless you can't reproduce this when the CSGPolygon is manually converted to a MeshInstance using a script.

3 things to try:

• Enable Smooth Trimesh Collision in the Project Settings (only effective for Bullet physics engine).
• Increase Physics Fps to 180 or 240 in the Project Settings.
• Switch the 3D physics engine to GodotPhysics in the Project Settings.

[ghost]

• Switching the 3D physics engine to GodotPhysics seemed to fix the bug.
  • Until I set CollisionShape to CapsuleShape
  • Set a small radius (0.2)

Incorrect.mp4

Bug does not happen to BoxShape and CapsuleShape with big radius in physics engine GodotPhysics.

• Increasing Physics FPS doesn't fix the bug.
• Enabling Smooth Trimesh Collision doesn't seem to fix the bug. It only decreases the amount of bounces.
  • Until I set CollisionShape to CapsuleShape which fixes the bug

Incorrect.mp4

Bug does happen to BoxShape.

Result

• For BoxShape Collision to work:
  • Physics engine: GodotPhysics
• For CapsuleShape Collision with small radius to work:
  • Physics engine: Bullet
  • Smooth Trimesh Collision: On

[ghost]

I confirm duplicate

• 3D rotating/spinning RigidBody bumpy collisions with Trimesh Static Body
• [Bullet] 3D RigidBody collisions with static collision shapes still bumpy

[ghost]

This is likely a duplicate of that issue, unless you can't reproduce this when the CSGPolygon is manually converted to a MeshInstance using a script.

I converted CSGPolygon to MeshInstance using a script and created a trimesh collision from it.

_update_shape()
var mesh = MeshInstance.new()
mesh.mesh = get_meshes()[1]
mesh.create_trimesh_collision()
add_child(mesh)

On CSGPolygon turned off Use Collision .
Bug still persists.

Alternative

• create_convex_collision() does not create a correct collision.

• create_multiple_convex_collisions() does not create a precise collision.