       SippVW shader
              This  Tcl  procedure  defines an Evans & Sutherland
              Volkswagen object with shader as the shader for its
              surfaces.   It  returns  an object handle.  This is
              really only the body of a VW, no  other  parts  are
              defined.    Also  only  the  outside  polygons  are
              defined, but its a fun object with a special  place
              in the history of computer graphics.
              The  VW  has  larger dimensions than the other pre-
              defined objects.  The default orientation in  world
              space  is  the  front  of the car facing down the Y
              axis and the roof of the car facing positive Z.
              It is also possible  to  independently  define  the
              individual  surfaces  that make up the VW.  This is
              useful if you wish to  use  different  shaders  for
              different surfaces.  Tcl procedures in the form:

                  SippVWxxxx side shader

              are used to define each surface.  Each call defines
              the surface for one side of the car.   Each  proce-
              dure  must  be  called  twice to product the entire
              body.  Side indicates which side  of  the  care  to
              create the surface for, it is one of LEFT of RIGHT.
              Shader is the shader to use  for  the  surface.   A
              surface  handle  is returned.  The following proce-
              dures are available to define the surfaces:

                 o SippVWBackFender - Back fender.
                 o SippVWBack - Back (trunk).
                 o SippVWBackSide - Back side panel.
                 o SippVWFrontDoor - Front door.
                 o SippVWFrontFender - Front fender.
                 o SippVWFrontSide - Front side panel.
                 o SippVWHood - Hood.
                 o SippVWFrontPanel - Front (below windshield) panel.
                 o SippVWRunningBoard - Running board.
                 o SippVWRoof - Roof.
