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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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