Enabling contact monitor causes frictionless RigidBody2d to act as if it has friction #375
Description
Describe the bug
When a RigidBody2D with friction 0.0 has contact monitoring enabled, or the maximum contact reporter limit is non-zero, or if 'visible debug shapes' are enabled, the rigid body acts as if it does have friction
To Reproduce
Steps to reproduce the behavior:
- setup project with a rigidbody2d (with zero horizontal motion and zero friction) sliding along a staticbody2d (with a constant_linear_velocity set and zero friction)
- run the project and observe the rigid body sliding as expected
- enable contact monitoring on the rigidbody2d, or enable visible collision shapes
- run the project and observe that the rigid body now moves along with the static body once it lands
demo video:
2025-08-01.17-50-21.mp4
Expected behavior
Enabling contact monitoring should not affect the apparent friction of the body.
Environment:
- OS: Windows 11
- Version: 0.8.10
- Godot Version: 4.5-beta3
- Type: simd single 2d
Example project(zip)
or https://github.com/pufferfish101007/godot-rapier2d-bug-demo