The GameObject's layer, which contains the Rigidbody, is used for "RigidBody.SweepTest" when retrieving a collider from a child GameObject with a non-collide-able layer

Unity: 3D Physics

6.5.X

6.4.X

6.3.X

6.2.X

6.1.X

6.0.X

2022.3.X

2021.3.X

Unity 6000.2 has reached its end of life and will not receive further updates. If you need additional fixes, please upgrade to a newer Unity version.

Unity 6.1 is no longer supported, as such this issue will not be handled on this release stream.

Closing the port to 6000.0.X, due to increased risk in bringing this fix over and available bandwidth. Cheers, AlexRvn.

Unity 2022LTS is no longer supported

Unity 2021LTS is no longer supported

How to reproduce:
1. Open the “IN-90907-SweepLayerBug.zip“ project
2. Open the “SampleScene“
3. Enter Play Mode
4. Observe the Console

Expected result: “Cube B hit? False“ is logged (“0 - 6 - 0“ log is not displayed)
Actual result: “Cube B hit? True“ and “0 - 6 - 6“ is displayed

Reproducible in: 2021.3.47f1, 2022.3.55f1, 6000.0.32f1, 6000.1.0a9

Reproduced on: Windows 11 Pro (23H2)
Not reproduced on: No other environment tested

Notes:

The child GameObject layer is set to (6: NoCollision) where in the collision matrix the logic is set for objects to collide only between layers 0 and 6
All parent GameObjects have their layers set to (0: Default)
“0 - 6 - 6“ respectively is the layers of the parent GameObject, the ground GameObject, the child (collider) GameObject
In the “SweepTest” method, the RigidBody retrieves the Collider from the child GameObject, but its layer is set as one of the parents'