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greg |
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.\" RCSid "$Id$" |
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greg |
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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) |
