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By Design
Votes
0
Found in
2019.4
2020.1.16f1
2020.3
2021.1
2021.2
Issue ID
1324394
Regression
No
Incorrect rendering from user's command buffer when mesh from disabled skinned mesh renderer is being swapped
Reproduction steps:
1. Download and open the attached "994948-skinned-mesh-renderer-bug.zip" project
2. In the Hierarchy window, select "Test" game object
3. In the Inspector window, observe that the "Enable Mesh Renderer" box is unchecked
4. Enter Play mode
Expected result: The Test game object is rendered correctly
Actual result: The Test game object is rendered incorrectly
Reproducible with: 2019.4.24f1, 2020.3.3f1, 2021.1.2f1, 2021.2.0a12
Could not test with: 2018.4 (Project breaks when downgrading)
Note: Expected and actual result videos are attached in the description
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Resolution Note:
This case has been closed by-design, however the problem area has had some changes. Now, instead of an assert being thrown a more helpful error message is generated and rendering of the Skinned Mesh Renderer is aborted. This is because the internal state of the skinned mesh renderer needs to track to mesh assigned to it, if that internal state isn't update then it can cause GPU crashes on Metal API based devices. After mesh swap the component must be given a chance to resync it's internal state to prevent this, this is done as part of the normal Unity update flow and happen after all user update method have run.