Substance Share provides for free exchange of 3D assets including material-sphere.obj
Used in Qt 3D pbr-materials example.
The sources can be found in qt3d-opensource-src-wYuGvA/qt3d-opensource-src-5.15.8+dfsg/examples/qt3d/exampleresources/assets/obj.
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Copyright (c) 2016, Allegorithmic
Creative Commons Attribution 4.0.