f2d15d4fd1
This fixes a bug where the rgb UsdUVTexture shader output attributes were created with incorrect type color3f when connected to UsdPreviewSurface diffuseColor and emissiveColor inputs. The UsdPreviewSurface specification requires the UsdUVTexture rgb output to be of type float3. This was happening because the UsdUVTexture outputs were created implicitly by the call to UsdShadeInput::ConnectToSource(). I.e., because the diffuseColor and emissiveColor inputs are of type color3f, this was the type assigned by default to the rgb source attributes as well. Now explicitly creating the UsdUVTexture shader output attributes with the correct types. Pull Request: https://projects.blender.org/blender/blender/pulls/114728
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