       SippShadows flag [size]
              This command globally enables or disables the cast-
              ing of shadows by objects.  If the boolean flag  is
              true, then shadows will be cast by lights that have
              shadows casting enabled.  Size defines the size  of
              the  depth  map  used  to render the shadows.  As a
              rule of thumb one could say  that  the  depth  maps
              should be at least as large as the image itself but
              this may vary from case to case.  Size  is  omitted
              when flag is false.
