NAME

       genrev - generate a RADIANCE description of surface of revolution

SYNOPSIS

       genrev mat name 'z(t)' 'r(t)' nseg [ -e expr ][ -f file ][ -s ]

DESCRIPTION

       Genrev  produces a RADIANCE scene description of a surface of revolution.  The object will
       be composed of nseg cones, cups, cylinders, tubes or rings following the parametric  curve
       defined  by  z(t)  (height)  and  r(t) (radius).  When z is increasing with t, the surface
       normal points outward.  When z is decreasing, the normal points inward.   The  variable  t
       used  in  the  function  expressions  varies  from  0  to  1 in even steps of 1/nseg.  The
       expressions are of the same type used in RADIANCE function files.   Auxiliary  expressions
       and/or  files  may be specified in any number of -e and -f options.  The -s option smooths
       the surfaces using Phong normal interpolation.

EXAMPLE

       To generate a torus with an inner radius of 1 and an outer radius of 3:

         genrev steel torus 'sin(2*PI*t)' '2+cos(2*PI*t)' 32

AUTHOR

       Greg Ward

BUGS

       The -s option doesn't modify the surface normal correctly for the opposite side.

SEE ALSO

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