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Physics objects trip and/or jump when colliding with other colliders



How to reproduce:
1. Open the user-attached “Physics Tripping” project
2. Open the “SampleScene” Scene (Assets/Scenes)
3. Enter Play Mode

Expected result: Both cubes slide smoothly along the planes
Actual result: “Cube 2” starts jumping at random intervals on the Plane with multiple Colliders

Reproducible with: 2020.3.36f1, 2021.3.5f1, 2022.1.8f1, 2022.2.0a18, 2023.1.0a2

- Not reproducible on a new project

  1. Resolution Note:

    This common physics simulation issue is sometimes referred to as the “internal edge conflict”. The issue occurs because contacts where the tiles meet can be generated with normals that are not perpendicular to the shared plane.

    Two most common solutions to this issue are using contact modification API to discard malformed contacts or to merge the mesh/box colliders into one single mesh.

Comments (1)

  1. atomicjoe

    Jun 30, 2022 16:35

    What do you mean by "Not reproducible on a new project" ?
    I was having this issue in all my project and decided to make a repro project just for the bug report, so it definitively reproduces on new projects.

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