Radiance genrev program

GENREV(1)                                                            GENREV(1)

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 revolu-
       tion.  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 oppo-
       site side.

SEE ALSO

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

RADIANCE                           11/15/93                          GENREV(1)