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