42 lines
1.9 KiB
Markdown
42 lines
1.9 KiB
Markdown
# Known limitations
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## Draco bit-stream version
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*Draco for Unity* supports bit-stream version 2,2 (details in the [specification](https://google.github.io/draco/spec/)). Older Draco data (with a bit-stream version is older than 2,2) might not be supported. See Draco compiler option [`DRACO_BACKWARDS_COMPATIBILITY`](https://github.com/google/draco/blob/9f856abaafb4b39f1f013763ff061522e0261c6f/cmake/draco_options.cmake#L94) for more information.
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That implies support for the following vertex attribute types
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- Position
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- Normal
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- Color
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- Texture coordinate
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In addition, support for bone joints and weights (required for blend shapes) can be achieved via generic attributes and attribute ID parameters. See [Blend shapes parameters](use-case-decoding.md#blend-shapes-parameters) for instructions.
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Draco bit-stream version 2,2 does not support vertex attribute types *tangent* and *material*.
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## Sub-mesh
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Multiple [sub-meshes](xref:Mesh.subMeshCount) are currently not supported. [DracoDecoder](xref:Draco.DracoDecoder) will always return a mesh with a single sub-mesh and the [DracoEncoder](xref:Draco.Encode.DracoEncoder) produces one result/Draco™ mesh per sub-mesh.
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## Animation
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Encoding animation (which was added in [Draco 1.3.4](https://github.com/google/draco#version-134-release)) is not supported.
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## Edge breaker support
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Only the standard edge breaker is supported, the predictive edge breaker is not.
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## Attribute Deduplication
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Attribute Deduplication is not enabled. See Draco compiler option [`DRACO_DECODER_ATTRIBUTE_DEDUPLICATION`](https://github.com/google/draco/blob/9f856abaafb4b39f1f013763ff061522e0261c6f/cmake/draco_options.cmake#L98) for more information.
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## Trademarks
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*Unity* is a registered trademark of [*Unity Technologies*][unity].
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*Draco™* is a trademark of [*Google LLC*][GoogleLLC].
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[GoogleLLC]: https://about.google/
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[unity]: https://unity.com
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