GENREV(1)						      General Commands Manual							 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 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)

RADIANCE
							     11/15/93								 GENREV(1)