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Fixed in 2019.2.X

Fixed in 2018.4.X, 2019.1.X

Votes

15

Found in

2018.3.0a5

2018.3.7f1

2019.2.0a1

Issue ID

1136868

Regression

Yes

Raycasts hit the second layer of the Mesh Collider when the first layer is thin

Physics

-

How to reproduce:
1. Open the "SampleScene" Scene in the attached "v2018.3.7test.zip" Project
2. Select "TestMesh" and click on the helmet Collar on the side where the helmet screen is
3. Move the Camera to see where the Raycast hit

Expected Behavior: The Raycast hits helmet screen
Actual Behavior: The Raycast hits helmet collar which is behind one thin helmet screen

Reproducible with: 2018.3.0a5, 2018.3.9f1, 2019.1.0b7, 2019.2.0a8
Not reproducible with: 2018.3.0a4

Note: Could not check with 2017.4 because of C# Environment version 6.0 the MeshCollider.Raycast cannot take the "out" parameter.

  1. Resolution Note (fix version 2019.2):

    Fixed in 2019.2.0a11 backported to 2018.4.3f1

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Comments (50)

  1. smithjohns402

    Jun 10, 2024 05:34

    You've encountered a bug in Unity where a Raycast is hitting the wrong object, hitting the "helmet collar" instead of the intended "helmet screen." This issue appears in versions 2018.3.0a5 through 2019.2.0a8 but not in version 2018.3.0a4. Report it to Unity's bug tracker for investigation.

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