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SETIT

       SUBROUTINE  SETIT (TIMAGE)
 C$    (Image Transformation)
 C$    Provide  a  4-dimensional  matrix,  TIMAGE(*,*),  which  is
 C$    applied to the image in 3-D NDC space before mapping it  to
 C$    the viewing surface.   Some device drivers,  such as  those
 C$    driving spooled plotters, may require that a second clip be
 C$    applied to  line segments  if  an image  transformation  is
 C$    provided which could transform points out of NDC space.
 C$
 C$    For those device drivers which  do not clip the image,  the
 C$    user may find it advisable to use routine MATSC to  rescale
 C$    TIMAGE(*,*) in order to  ensure that the transformed  image
 C$    lies  entirely  within  NDC   space.   This  will   prevent
 C$    distracting wraparound on many CRT devices.
 C$    (01-APR-82)