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Fixed in 2021.1.X

Fixed in 2019.4.X, 2020.2.X



Found in




Issue ID




Editor crashes on CompressedMesh::Compress when using VertexAttributeFormat.Float16 and Mesh compression is enabled

Graphics - LowLevel


Reproduction steps:
1. Open the attached "" project
2. Right-click on the "face.fbx" in the Project window to open the context menu
3. Select Reimport
-- Observe the crash

Reproducible with: 2019.4.7f1, 2020.1.1f1, 2020.2.0a20
Could not test with 2018.4 due to multiple compilation errors

Note: two asserts are failing before the crash occurs:
1) Assertion failed on expression: 'chantype.format == kVertexFormatFloat'
(Filename: C:\buildslave\unity\build\Runtime/Graphics/Mesh/CompressedMesh.cpp Line: 370)
2) Assertion failed on expression: 'chanType.dimension == 0'
(Filename: C:\buildslave\unity\build\Runtime/Graphics/Mesh/Mesh.h Line: 140)

Top 5 lines of the stack trace:
0x00007FF785E11660 (Unity) CompressedMesh::Compress
0x00007FF785DC476D (Unity) Mesh::Transfer<StreamedBinaryWrite>
0x00007FF784C3922B (Unity) SerializedFile::WriteObject
0x00007FF784C034C9 (Unity) PersistentManager::WriteFile
0x00007FF784C04374 (Unity) PersistentManager::WriteFile

  1. Resolution Note (fix version 2020.2):

    Fixed in: 2020.2.2f1

  2. Resolution Note (fix version 2019.4):

    Fixed in: 2019.4.16f1

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