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.\" RCSid "$Id$"
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greg |
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.TH GENPRISM 1 3/19/96 RADIANCE
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.SH NAME
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genprism - generate a RADIANCE description of a prism
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.SH SYNOPSIS
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.B "genprism mat name"
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{
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.B -
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.B vfile
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.B "N v1 v2 .. vN"
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}
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[
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.B "\-l lvect"
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][
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.B "\-r radius"
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][
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.B \-c
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][
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.B \-e
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]
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.SH DESCRIPTION
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.I Genprism
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produces a RADIANCE scene description of a prism, or extruded polygon.
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The polygon to extrude lies in the z==0 plane, and
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is given as a list of (x,y) pairs on the
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standard input (-), or from the file
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.I vfile,
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or on the command line preceded by the number of vertices,
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.I N.
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The order of the vertices and the extrusion vector
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.I lvect
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(default (0,0,1)) determine the surface orientations.
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The surfaces that make up the prism will be modified by
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.I mat
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and their identifiers will begin with
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.I name.
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The
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.I \-r
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option may be used to round the corners of the object using spheres
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and cylinders.
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The
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.I \-c
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option inhibits generation of a face connecting the last vertex to the first.
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The
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.I \-e
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option inhibits generation of the end polygons.
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.SH EXAMPLE
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To produce a equilateral triangular prism:
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.IP "" .2i
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genprism clear_plastic prism 3 0 0 .5 .866 1 0
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.SH AUTHOR
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Greg Ward
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.SH BUGS
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The rounding option only works for opaque prisms with outward facing
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normals.
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If the normals face inward, the appearance will be bizarre.
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.SH "SEE ALSO"
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genbox(1), genrev(1), gensurf(1), genworm(1), rpict(1), rview(1), xform(1)
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