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Adjacent faces have opposite normals:
In the case of Rhino 3D your model will already have decent UVs that were created during the modeling process. One could use the UV editor in Rhino and use Align->Distribute commands and transform tools to manually package UVs. This would become tedious with many separate objects and Rhino's limited UV toolset. Therefore I would suggest exporting to Blender or another DCC software to package the UV islands.
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