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Fixed in 2020.2.X

Fixed in 2018.4.X, 2019.3.X, 2020.1.X



Found in




Issue ID




[Windows] A lot of time is required extracting Smoothing Groups when using certain FBX files

Asset - Importers


How to reproduce:
1. Create a project with the default 3D template
2. Download the attached FBX file
3. Import the FBX file to the project

Expected result: Import takes up to 5-8 minutes to finish
Actual result: Import takes around 2 hours to finish

Reproducible with: 2018.4.18f1, 2019.3.4f1, 2020.1.0a25, 2020.2.0a1
Couldn't test with: 2017.4.37f1 (There is no option to prefer smoothing groups)

1. Import on macOS takes up to 8 minutes
2. If FBX Model's Smoothness Source option is set to "From Angle", the model is imported a lot faster (~20 seconds)

  1. Resolution Note (fix version 2020.2):

    Fixed in 2020.2.0a4

  2. Resolution Note (fix version 2020.1):

    Fixed in Unity 2020.1.0b4

  3. Resolution Note (fix version 2019.3):

    Fixed in Unity 2019.3.10f1

  4. Resolution Note (fix version 2018.4):

    Fixed in Unity 2018.4.24f1

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