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