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Won't Fix

Votes

0

Found in

2018.4

2019.4

2020.2

2020.2.6f1

2021.1

2021.2

Issue ID

1317454

Regression

No

OverlapCapsule falsely detects an overlap with a nearby MeshCollider when the start and end points of the capsule are very close

Physics

-

How to reproduce:
1. Open the user's attached project
2. Open the Main Scene
3. In the Hierarchy focus the OverlapTester GameObject
4. Observe the sphere gizmo

Expected result: The sphere gizmo is green
Actual result: The sphere gizmo is red

Reproducible with: 2018.4.32f1, 2019.4.21f1, 2020.2.7f1, 2021.2.0a7

Notes:
- The issue doesn't reproduce when the Convex property of the Quad's Mesh Collider is set to true
- The issue reproduces with both OverlapCapsule() and OverlapCapsuleNonAlloc()

  1. Response avatar

    Resolution Note:

    Using degenerate capsules raises a condition in PhysX where distance is computed to a zero length linear segment. To avoid this, always prefer OverlapSphere and OverlapSphereNonAlloc for degenerate capsules with endpoints closer than epsilon (~1e-5)

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