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Additional texture coordinate.
UVs usually use Vector2 format. Vector2 uses two 32-bit floats; 8 bytes in total.
This vertex attribute maps to the
TEXCOORD2 semantic in HLSL. This UV channel is also commonly called "UV2". It corresponds to Mesh.uv3.
See Also: Mesh.HasVertexAttribute, Mesh.GetUVs, Mesh.SetUVs.