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The ShapeHints node also affects how default normals are generated.
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When an IndexedFaceSet has to generate default normals, it uses the creaseAngle field to determine which edges should be smoothly shaded and which ones should have a sharp crease.
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The crease angle is the angle between surface normals on adjacent polygons.
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For example, a crease angle of .5 radians (the default value) means that an edge between two adjacent polygonal faces will be smooth shaded if the normals to the two faces form an angle that is less than .5 radians (about 30 degrees).
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Otherwise, it will be faceted.
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