genrev(1)
generate a RADIANCE description of surface of revolution
SYNOPSIS
genrev mat name 'z(t)' 'r(t)' nseg
[
-e expr
][
-f file
][
-s
]
DESCRIPTION
Genrev
produces a RADIANCE scene description of a
surface of revolution.
The object will be composed of
nseg
cones, cups, cylinders, tubes or rings
following the parametric curve defined by
z(t)
(height)
and
r(t)
(radius).
When
z
is increasing with t, the surface normal points outward.
When
z
is decreasing, the normal points inward.
The variable
t
used in the function expressions varies
from 0 to 1 in even steps of
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
-e
and
-f
options.
The
-s
option smooths the surfaces using Phong normal interpolation.
EXAMPLE
To generate a torus with an inner radius of 1 and an outer radius
of 3:
-
genrev steel torus 'sin(2*PI*t)' '2+cos(2*PI*t)' 32
AUTHOR
Greg Ward
BUGS
The -s option doesn't modify the surface normal correctly
for the opposite side.
