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       genprism - generate a RADIANCE description of a prism


       genprism mat name { - | vfile | N v1 v2 .. vN } [ -l lvect ][ -r radius
       ][ -c ][ -e ]


       Genprism produces a RADIANCE scene description of a prism, or  extruded
       polygon.   The  polygon to extrude lies in the z==0 plane, and is given
       as a list of (x,y) pairs on the standard input (-), or  from  the  file
       vfile,  or  on  the command line preceded by the number of vertices, N.
       The order of the vertices  and  the  extrusion  vector  lvect  (default
       (0,0,1)) determine the surface orientations.  The surfaces that make up
       the prism will be modified by mat and their identifiers will begin with
       name.   The  -r  option  may be used to round the corners of the object
       using spheres and cylinders.  The -c option inhibits  generation  of  a
       face  connecting  the last vertex to the first.  The -e option inhibits
       generation of the end polygons.


       To produce a equilateral triangular prism:

         genprism clear_plastic prism 3 0 0 .5 .866 1 0


       Greg Ward


       The rounding option only works for opaque prisms  with  outward  facing
       normals.  If the normals face inward, the appearance will be bizarre.


       genrbox(1),   genrev(1),   gensurf(1),  genworm(1),  rpict(1),  rvu(1),