NAME

       genprism - generate a RADIANCE description of a prism

SYNOPSIS

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

DESCRIPTION

       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.

EXAMPLE

       To produce a equilateral triangular prism:

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

AUTHOR

       Greg Ward

BUGS

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

SEE ALSO

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

RADIANCE                                             3/19/96                                         GENPRISM(1)