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The lowest polygon tessellation will do. If the model has curved surfaces, this setting would need to be tweaked. Depending on the modeling operation Rhino may create too many polygons from a curved surface for a the game engine to handle well.
step 3 : Import model into Blender and package UVs. This is the minimum requirement for the game engine. In a proper model, one would spend more time stitching neighboring UVs together and maximizing texture space
