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)