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Postponed means that the issue was either a feature request or something that requires major refactoring on our side. Since that makes the issue not actionable in the close future we choose to close it as Postponed and add it on our internal roadmaps and technical debt pages instead.




Found in






Issue ID




Some models have missing submeshes when imported as .obj

Asset Importers


Reproduction steps:
1. Open attached project ("SubMeshBug")
2. In the Project window, select "Ray Dagger" asset
-- In Inspector window, notice that there is only one Remapped Material
3. In the Project window, select "Ray DaggerBlend" asset
-- In Inspector window, notice that there are two Remapped Materials

Expected: Imported .obj has the two submeshes
Actual: Imported .obj has only one submesh

Reproduced with: 2017.4.18f1, 2018.3.3f1, 2019.1.0a14, 2019.2.0a1

- Another model (Avenger) in the project with same topology structure and UV mapping does not exhibit the issue

  1. Response avatar

    Resolution Note:

    The issue is in the FBX SDK.
    It looks like the FBX SDK cannot resolve the .mtl path if it contains a space, replacing 'mtllib Ray Dagger.mtl' by 'mtllib Ray_Dagger.mtl' and updating the .mtl file name accordingly fixes the issue.

Comments (2)

  1. 11f9cf9474a41618be74bd6fe8ad4cc9?d=mm


    Jul 30, 2020 06:10

    Unity is a website using to search and track issues. It has a detail about postponed that means the issue was either a feature request or something. They might have technical issues in their internal maps. I prefer to check <a href="">should i hire a wealth manager</a> to learn more new ways of net worth. You can attach your working model here for more join it.

  2. 694d8c4c3253b1b9d4a077d6d96150d7?d=mm


    Oct 13, 2019 12:40

    Happens with .obj too, i removed the spaces from all files names (texture, gamesobjects, .obj and materials) and now my submeshes and materials don't vanish.
    Latest LTS 2017, 2019

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