man/man1/genskyvec.1

.\" RCSid $Id: genskyvec.1,v 1.1 2009/12/10 00:17:19 greg Exp $
.TH GENSKYVEC 1 12/09/09 RADIANCE
.SH NAME
genskyvec - compute patch radiance averages for a specific sky
.SH SYNOPSIS
.B genskyvec
[
.B "\-m N"
][
.B "\-c r g b"
]
.SH DESCRIPTION
.I Genskyvec
samples the
.I Radinace
sky description given on the standard input to generate a list of
average patch radiances.
If there is a sun in the description,
.I genskyvec
will include its contribution in the three nearest sky patches,
distributing energy according to centroid proximity.
.PP
By default,
.I genskyvec
divides the sky into 2305 patches, plus one patch for the ground.
This corresponds to Reinhart's extension of the Tregenza sky,
where the original 145 patches are subdivided into 16 subpatches,
except at the zenith.
A different subdivision may be specified via the
.I \-m
option.
The value given will be used to subdivide each dimension, so the
default of 4 yields almost 16 times as many patches
as the original Tregenza sky, which can be specified with
.I "\-m 1."
A higher resolution sky is generally better for daylight
coefficient analysis where solar position is important.
.PP
The
.I \-c
option may be used to specify a color for the sky.
The gray value should equal 1 for proper energy balance
The default sky color is
.I "\-c 0.960 1.004 1.118".
.SH EXAMPLE
To generate 578 patches corresponding to a 2x2 subdivision of the
Tregenza sky on a sunny equinox noon:
.IP "" .2i
gensky 9 21 12 | genskyvec -m 2 > sky09_21_12.dat
.SH AUTHOR
Greg Ward
.SH "SEE ALSO"
dctimestep(1), genBSDF(1), gensky(1), gentregvec(1), rtcontrib(1), rtrace(1)
Revision:	1.2
Committed:	Fri Sep 3 23:53:49 2010 UTC (15 years, 1 month ago) by greg
Branch:	MAIN
CVS Tags:	rad4R1
Changes since 1.1:	+2 -2 lines
Log Message:	Working version of genBSDF with detail geometry support in mkillum
#	Content
1	.\" RCSid $Id: genskyvec.1,v 1.1 2009/12/10 00:17:19 greg Exp $
2	.TH GENSKYVEC 1 12/09/09 RADIANCE
3	.SH NAME
4	genskyvec - compute patch radiance averages for a specific sky
5	.SH SYNOPSIS
6	.B genskyvec
7	[
8	.B "\-m N"
9	][
10	.B "\-c r g b"
11	]
12	.SH DESCRIPTION
13	.I Genskyvec
14	samples the
15	.I Radinace
16	sky description given on the standard input to generate a list of
17	average patch radiances.
18	If there is a sun in the description,
19	.I genskyvec
20	will include its contribution in the three nearest sky patches,
21	distributing energy according to centroid proximity.
22	.PP
23	By default,
24	.I genskyvec
25	divides the sky into 2305 patches, plus one patch for the ground.
26	This corresponds to Reinhart's extension of the Tregenza sky,
27	where the original 145 patches are subdivided into 16 subpatches,
28	except at the zenith.
29	A different subdivision may be specified via the
30	.I \-m
31	option.
32	The value given will be used to subdivide each dimension, so the
33	default of 4 yields almost 16 times as many patches
34	as the original Tregenza sky, which can be specified with
35	.I "\-m 1."
36	A higher resolution sky is generally better for daylight
37	coefficient analysis where solar position is important.
38	.PP
39	The
40	.I \-c
41	option may be used to specify a color for the sky.
42	The gray value should equal 1 for proper energy balance
43	The default sky color is
44	.I "\-c 0.960 1.004 1.118".
45	.SH EXAMPLE
46	To generate 578 patches corresponding to a 2x2 subdivision of the
47	Tregenza sky on a sunny equinox noon:
48	.IP "" .2i
49	gensky 9 21 12 \| genskyvec -m 2 > sky09_21_12.dat
50	.SH AUTHOR
51	Greg Ward
52	.SH "SEE ALSO"
53	dctimestep(1), genBSDF(1), gensky(1), gentregvec(1), rtcontrib(1), rtrace(1)