![]() The render mesh is always an approximation of the surface, so there are almost always gaps between the faceted render mesh and the actual smooth surface. While a mesh has the advantages of shading speed and adjustability, there is a disadvantage. So what you see on the screen when the model is shaded is a special, invisible polygon mesh (the render mesh) that is attached to the actual NURBS surface. Although Rhino is a NURBS surface modeler, it uses polygon meshes created from those surfaces for visualization purposes.
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