此网格中的顶点属性会在 MeshRenderer 中重写或添加主网格的属性。
This can be used for vertex painting tools, etc. This data is serialized.
例如，如果主网格未包含 Mesh.colors 通道，则使用 additionalVertexStreams 中的颜色。如果主网格包含颜色通道并且 additionalVertexStreams 网格也具有颜色，则使用 additionalVertexStreams 中的颜色。
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