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genrev - generate a RADIANCE description of surface of
revolution
genrev mat name `z(t)' `r(t)' nseg [ -e expr ][ -f file ][
-s ]
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.
To generate a torus with an inner radius of 1 and an outer
radius of 3:
genrev steel torus `sin(2*PI*t)' `1+cos(2*PI*t)' 32
Greg Ward
The -s option doesn't modify the surface normal correctly
for the opposite side.
calc(1), genbox(1), gensurf(1), genworm(1), rpict(1),
rview(1), xform(1)
Header and Footer
GENREV(1) RADIANCE (11/15/93) GENREV(1)
Page 1 (printed 7/17/96)
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