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By Design
Votes
1
Found in
2021.2.0a1
2021.2.0b2
2022.1
Issue ID
1351441
Regression
Yes
Imported model with Animation is not displayed/displayed incorrectly
How to reproduce:
1. Open the attached "case_1351441.zip" project
2. Observe the model in the Game view
Expected result: all model parts are in the correct position
Actual result: Frame_low GameObject is in the incorrect position (should be in hands)
Reproducible with: 2021.2.0a1, 2021.2.0b7, 2022.1.0a5
Not reproducible with: 2019.4.29f1, 2020.3.15f2, 2021.1.17f1
Notes:
1. With Unity 2021.2.0a1, 2021.2.0a20 and 2022.1.0a4, 2022.1.0a5 - model is visible but some parts are in wrong position
2. With Unity 2021.2.0a21, 2021.2.0b7 and 2022.1.0a1, 2022.1.0a3 - model is not visible at all
3. Warning that appears:
"ImportFBX Warnings:
Mesh 'Frame_low' has 6671 (out of 6671) vertices with no weight and bone assigned (they will be assigned to bone #0 with weight 1). The list of vertices: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 and so on..."
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Resolution Note (2022.1.X):
Prior to 2021.2, when bones where imported which were not bound to vertices the Model Importer stripped them. This made the generation of reusable rigs more challenging.
From 2021.2 onwards a new flag was added to the Model Importer to enable/disable stripping. For existing assets it's enabled by default (preserving the existing functionality), but for new assets it's disabled. In this case, enabling the "OptimizeBones" flag on the Model Importer returns it to the existing functionality.