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Fixed in 2022.1.X

Fixed in 2020.3.X, 2021.1.X, 2021.2.X



Found in




Issue ID




FBX model has broken UV mapping when the imported model is duplicated or using a newer Unity version

Asset - Importers


How to reproduce:
1. Create a new project using the default 3D template
2. Import an FBX model
3. Drag the model into the Scene View
4. Duplicate the model (shortcut CMD+D)
5. Drag the duplicated model into the Scene View
6. Inspect the original and duplicated models

Expected result: Both models have properly mapped UVs and Textures and look the same
Actual result: Either the duplicated or both of the models have broken UV mapping

Reproducible with: 2020.3.10f1 (UV mapping break when the model is duplicated), 2020.3.11f1, 2020.3.13f1, 2021.1.13f1, 2021.2.0b1 (UV mapping breaks when the model is imported)
Not reproducible with: 2019.4.28f1, 2020.3.9f1

- UV mapping is broken on both the imported model and the duplicated one when using Unity 2020.3.13f1, 2021.1.13f1, 2021.2.0b1
- Tested with FBX model exported from Cheetah3D
- Reimporting the model on 'not reproducible' versions fixed the issue when downgrading the project
- Reimporting the model on 'reproducible' versions introduces the issue when upgrading the project

  1. Resolution Note (fix version 2022.1):

    Fixed in Unity 2022.1.0a6 and above

  2. Resolution Note (fix version 2021.2):

    Fixed in Unity 2021.2.0b9

  3. Resolution Note (fix version 2021.1):

    Fixed in 2021.1.20f1

  4. Resolution Note (fix version 2020.3):

    Fixed in Unity 2020.3.17f1

Comments (1)

  1. Seola

    Jul 26, 2023 12:28

    It still doesn't work. Unity version 2022.3.5f1
    According to my observations, this is not UV, this is bug material.
    1. Create a material with a mobile/diffuse shader (let's call it mat1)
    2. Drag the Model to the stage
    3. Assign a material to it
    4. Duplicate many objects (I have 1444).
    5. Duplicate material (mat1)
    6. Assign a new material (mat2) to one of the models
    7. All models will look like they have no UV.

    How to fix:
    1. Create a new material
    2. Assign mobile/diffuse shader
    3. Select all models and assign a new material to them.

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