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KnownIssues.md

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Known Issues

Import

  • ¹Vertex accessors (positions, normals, etc.) that are used across meshes are duplicated and result in higher memory usage and slower loading (see this comment)
  • ¹When using more than one sampler on one image, that image is duplicated and results in higher memory usage
  • Texture sampler minification/magnification filter limitations (see issue):
    • ¹There's no differentiation between minFilter and magFilter. minFilter settings are prioritized.
    • ¹minFilter mode NEAREST_MIPMAP_LINEAR is not supported and will result in NEAREST.

¹: A Unity API limitation.

Export

Non-readable Meshes

Exporting non-readable meshes is not supported!

Turn on Read/Write Enabled on all model importer settings that you intend to export to glTF later at runtime to ensure it works reliably (see FBX importer settings as example).

While exporting non-readable meshes in general is feasible (via reading back index and vertex buffers from GPU memory) it has proven to be unreliable across platforms and graphics APIs, especially builds made with Unity version 2022 and older. The fact that it seems to work stable in Editor playmode is deceptive. The problem seems to be better in Unity 6 Preview, but there's not enough data to support that so use at own risk.

Trademarks

Unity® is a registered trademark of Unity Technologies.

Khronos® is a registered trademark and glTF™ is a trademark of The Khronos Group Inc.