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.\" RCSid "$Id"
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.TH GENREV 1 11/15/93 RADIANCE
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.SH NAME
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genrev - generate a RADIANCE description of surface of revolution
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.SH SYNOPSIS
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.B "genrev mat name 'z(t)' 'r(t)' nseg"
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[
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.B "\-e expr"
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][
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.B "\-f file"
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][
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.B \-s
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]
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.SH DESCRIPTION
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.I Genrev
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produces a RADIANCE scene description of a
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surface of revolution.
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The object will be composed of
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.I nseg
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cones, cups, cylinders, tubes or rings
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following the parametric curve defined by
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.I z(t)
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(height)
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and
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.I r(t)
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(radius).
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When
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.I z
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is increasing with t, the surface normal points outward.
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When
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.I z
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is decreasing, the normal points inward.
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The variable
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.I t
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used in the function expressions varies
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from 0 to 1 in even steps of
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.I 1/nseg.
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The expressions are of the same type used in RADIANCE
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function files.
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Auxiliary expressions and/or files may be specified
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in any number of
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.I \-e
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and
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.I \-f
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options.
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The
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.I \-s
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option smooths the surfaces using Phong normal interpolation.
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.SH EXAMPLE
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To generate a torus with an inner radius of 1 and an outer radius
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of 3:
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.IP "" .2i
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genrev steel torus 'sin(2*PI*t)' '1+cos(2*PI*t)' 32
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.SH AUTHOR
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Greg Ward
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.SH BUGS
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The -s option doesn't modify the surface normal correctly
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for the opposite side.
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.SH "SEE ALSO"
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calc(1), genbox(1), gensurf(1), genworm(1), rpict(1), rview(1), xform(1)
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