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						Rotations can transform the orientation of a shape in any direction.
                     
                        Rotation orients a coordinate system about a rotation axis by a rotation angle measured in radians.
                        To help remember positive and negative rotation directions: open your hand, stick out your thumb,
                        aim your thumb in an axis positive direction, and curl your fingers around the axis.
                        The curl direction is a positive rotation.
                     
                           These X3D scenes are adapted directly from the
                           original VRML 2.0 Sourcebook chapter examples.
                           Also available:
                           Introduction to VRML97 SIGGRAPH98 course notes.
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