man/man1/genblinds.1

.\" RCSid "$Id: genblinds.1,v 1.4 2005/12/28 19:42:13 greg Exp $"
.TH GENBLINDS 1 10/10/94 RADIANCE
.SH NAME
genblinds - generate a RADIANCE description of venetian blinds
.SH SYNOPSIS
.B "genblinds mat name depth width height nslats angle"
[
.B "\-r|+r rcurv"
]
.SH DESCRIPTION
.I Genblinds
produces a RADIANCE scene description of a set of venetian blinds.
The
.I depth
of the blinds (X dimension) is given first, followed by the
.I width
(Y dimension), followed by the
.I height
(Z dimension).
The number of slats to place evenly within this height is given as
.I nslats.
The
.I angle
of the blind, where zero is perfectly horizontal and a
positive angle tilts the positive X edge upwards, is
given in degrees.
The blinds are initially situated so that the corner of the bottom blind is
.I "height/nslats/2"
above the XY plane, and all coordinates are positive.
Each new slat is placed
.I "height/nslats"
above the previous one, until the top slat is at
.I "height - height/nslats/2".
The blinds may of course be moved from this starting point with the
.I "xform(1)"
command.
.PP
If curved blinds are desired, a radius of curvature may be given
with the
.I "+/-r"
option.
If given as
.I +r,
The curvature is upward (which is the usual configuration).
If the option is given as
.I -r,
then the curvature is downward.
The radius indicates how far from each slat its effective
cylindrical center resides.
Each slat will be broken into as many polygons as is necessary to
keep the delta changes in angle less than 10 degrees.
(Note that this may result in a rather large number of polygons.)\0
.SH EXAMPLE
To produce a curved set of blinds with 15 slats:
.IP "" .2i
genblinds white blind 1 46 88 118 15 \-r 1 > blinds.rad
.SH AUTHOR
Jean-Louis Scartezzini and Greg Ward
.SH "SEE ALSO"
genbox(1), genrev(1), gensurf(1), genworm(1), rpict(1), rvu(1), xform(1)
Revision:	1.5
Committed:	Tue Sep 4 17:36:40 2007 UTC (18 years, 1 month ago) by greg
Branch:	MAIN
CVS Tags:	rad3R9
Changes since 1.4:	+2 -2 lines
Log Message:	Added backslashes in front of hyphens (thanks to Bernd Zeimetz for his effort)
#	User	Rev	Content
1	greg	1.5	.\" RCSid "$Id: genblinds.1,v 1.4 2005/12/28 19:42:13 greg Exp $"
2	greg	1.1	.TH GENBLINDS 1 10/10/94 RADIANCE
3			.SH NAME
4			genblinds - generate a RADIANCE description of venetian blinds
5			.SH SYNOPSIS
6			.B "genblinds mat name depth width height nslats angle"
7			[
8			.B "\-r\|+r rcurv"
9			]
10			.SH DESCRIPTION
11			.I Genblinds
12			produces a RADIANCE scene description of a set of venetian blinds.
13			The
14			.I depth
15			of the blinds (X dimension) is given first, followed by the
16			.I width
17			(Y dimension), followed by the
18			.I height
19			(Z dimension).
20			The number of slats to place evenly within this height is given as
21			.I nslats.
22			The
23			.I angle
24			of the blind, where zero is perfectly horizontal and a
25			positive angle tilts the positive X edge upwards, is
26			given in degrees.
27			The blinds are initially situated so that the corner of the bottom blind is
28			.I "height/nslats/2"
29			above the XY plane, and all coordinates are positive.
30			Each new slat is placed
31			.I "height/nslats"
32			above the previous one, until the top slat is at
33			.I "height - height/nslats/2".
34			The blinds may of course be moved from this starting point with the
35			.I "xform(1)"
36			command.
37			.PP
38			If curved blinds are desired, a radius of curvature may be given
39			with the
40			.I "+/-r"
41			option.
42			If given as
43	greg	1.4	.I +r,
44			The curvature is upward (which is the usual configuration).
45			If the option is given as
46	greg	1.1	.I -r,
47	greg	1.4	then the curvature is downward.
48	greg	1.1	The radius indicates how far from each slat its effective
49			cylindrical center resides.
50			Each slat will be broken into as many polygons as is necessary to
51			keep the delta changes in angle less than 10 degrees.
52			(Note that this may result in a rather large number of polygons.)\0
53			.SH EXAMPLE
54			To produce a curved set of blinds with 15 slats:
55			.IP "" .2i
56	greg	1.5	genblinds white blind 1 46 88 118 15 \-r 1 > blinds.rad
57	greg	1.1	.SH AUTHOR
58			Jean-Louis Scartezzini and Greg Ward
59			.SH "SEE ALSO"
60	greg	1.3	genbox(1), genrev(1), gensurf(1), genworm(1), rpict(1), rvu(1), xform(1)