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Third Party Issue

Votes

0

Found in

2019.4

2020.3

2021.1

2021.1.17f1

2021.2

2022.1

Issue ID

1372649

Regression

No

Linecast misses MeshCollider when casting a ray from certain positions

Physics

-

How to reproduce:
1. Open the user-submitted project
2. Open the Scene "Bugs" (Assets/Scenes/Bugs.unity)
3. In the Hierarchy window, select the GameObject "BugTest"
4. In the Inspector window, open the "Bugs Component" Script's context menu and select "Raycast"
5. In the Scene view, observe the Line Gizmo coming from the "BugTest" GameObject

Expected result: The Line Gizmo ends at the wall
Actual result: The Line Gizmo goes through the wall

Reproducible with: 2019.4.31f1, 2020.3.20f1, 2021.1.24f1, 2021.2.0b16, 2022.1.0a12

  1. Resolution Note:

    The issue stems from the PhysX baking process. To workaround the bug disable "Use fast midphase" in the Mesh Collider cooking options.

Comments (1)

  1. mgear

    Oct 12, 2023 12:19

    got extra info:
    "If this is due to a limitation of BVH34 then this will never be "fixed". However there is an error report when the build fails and in that case you can silently fallback to BVH33.

    That limitation is due to a limited number of bits in the BVH nodes to encode indices, so this can happen on large meshes. Past PhysX versions didn't report an error in that case (we weren't aware of it) so it could be difficult to detect. More recent builds report the error."

    https://forum.unity.com/threads/use-fast-midphase-raycast-not-registering-warning.1194763/#post-9405185

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