.\" RCSid "$Id: genrev.1,v 1.7 2018/05/04 23:56:49 greg Exp $"
.TH GENREV 1 11/15/93 RADIANCE
.SH NAME
genrev - generate a RADIANCE description of surface of revolution
.SH SYNOPSIS
.B "genrev mat name 'z(t)' 'r(t)' nseg"
[
.B "\-e expr"
][
.B "\-f file"
][
.B \-s
]
.SH DESCRIPTION
.I Genrev
produces a RADIANCE scene description of a
surface of revolution.
The object will be composed of
.I nseg
cones, cups, cylinders, tubes or rings
following the parametric curve defined by
.I z(t)
(height)
and
.I r(t)
(radius).
When
.I z
is increasing with t, the surface normal points outward.
When
.I z
is decreasing, the normal points inward.
The variable
.I t
used in the function expressions varies
from 0 to 1 in even steps of
.I 1/nseg.
The expressions are of the same type used in RADIANCE
function files.
Auxiliary expressions and/or files may be specified
in any number of
.I \-e
and
.I \-f
options.
The variable and function definitions in each
.I \-f source
file are read and compiled from the RADIANCE library where it is found.
The
.I \-s
option smooths the surfaces using Phong normal interpolation.
.SH EXAMPLE
To generate a torus with an inner radius of 1 and an outer radius
of 3:
.IP "" .2i
genrev steel torus 'sin(2*PI*t)' '2+cos(2*PI*t)' 32
.SH ENVIRONMENT
RAYPATH		the directories to check for auxiliary files.
.SH AUTHOR
Greg Ward
.SH "SEE ALSO"
genbox(1), gencat(1), genprism(1), gensurf(1),
genworm(1), rcalc(1), rpict(1), rvu(1), xform(1)