Known limitations

Draco bit-stream version

Draco for Unity supports bit-stream version 2,2 (details in the specification). Older Draco data (with a bit-stream version is older than 2,2) might not be supported. See Draco compiler option DRACO_BACKWARDS_COMPATIBILITY for more information.

That implies support for the following vertex attribute types

• Position
• Normal
• Color
• Texture coordinate

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 for instructions.

Draco bit-stream version 2,2 does not support vertex attribute types tangent and material.

Sub-mesh

Multiple sub-meshes are currently not supported. DracoDecoder will always return a mesh with a single sub-mesh and the DracoEncoder produces one result/Draco™ mesh per sub-mesh.

Animation

Encoding animation (which was added in Draco 1.3.4) is not supported.

Edge breaker support

Only the standard edge breaker is supported, the predictive edge breaker is not.

Attribute Deduplication

Attribute Deduplication is not enabled. See Draco compiler option DRACO_DECODER_ATTRIBUTE_DEDUPLICATION for more information.

Trademarks

Unity is a registered trademark of Unity Technologies.

Draco™ is a trademark of Google LLC.