Hi German,
Sorry to have taken so long to respond. When I first read your email I
didn't have time to dig in and planned to come back to it. Then I promptly
forgot about it.
The one thing that stands out, and could be a major source of error for a
clear sky is the ground reflectance. You're using 70% in the rtraced model,
but you aren't using it in the 5-phase method. Though if you have large-ish
local ground plane defined in scene.rad (which you always should, but even
the best of us sometimes leave out) this will be less of a problem.
You can specify ground reflectance in gendaymtx with the -g argument. The
default is -g 0.2 0.2 0.2 (which is a lot different from 70%). You
gendaymtx command would look something like this:
gendaymtx -h -g 0.7 0.7 0.7 -m 1 Santiago.wea > full_sky.skv
Let me know if this doesn't improve things and I'll dig in further.
Andy
···
On Tue, Sep 9, 2014 at 8:41 AM, CHI-German Molina <[email protected]> wrote:
Dear All,
I have been trying to replicate the "DAYSIM Daylight Coefficients",
comparing those results with the RTRACE output. I am doing this following
the 5 phase method tutorial, but I have not been succesful yet. Any
comments would be great! I am not sure I am doing this well...So, what I did is to separate the whole scene (including overhangs) from
the window.*FILE CONTENT*
##White.sky
void glow skymat
0
0
4 1 1 1 0skymat source skysource
0
0
4 0 0 1 360## suns.rad
void light solar 0 0 3 1e6 1e6 1e6
solar source sun 0 0 4 0 0.999 0.018 0.018 0.533
.....
lots of them.## black.rad
void plastic black
0
0
5 0 0 0 0 0##clear.sky
!gendaylit 3 1 9.5 -W 756 189 -g 0.7 -a -33.38 -o 70.78 ##There is a
big ground with 70% reflectanceskyfunc glow skyglow
0
0
4 1 1 1 0skyglow source skysource
0
0
4 0 0 1 360##Santiago.wea
place SANTIAGO_CHL
latitude -33.38
longitude 70.78
time_zone 60
site_elevation 476.0
weather_data_file_units 1
1 1 9.5 756 189*RTRACE CALCULATIONS*
oconv Materials/* scene.rad clear.sky windows.rad > clear_octree.oct
cat Workplanes/WP.pts | rtrace -n 4 -I -ab 8 -ad 50000 -lw 2e-5 -dc 1 -dt
0 -dj 0 -st 1 -ss 0 -faa -af amb.af clear_octree.oct > rtrace.lux*DC CALCULATIONS*
#Full sky DC
oconv Materials/* scene.rad windows.rad white.sky > white_octree.oct
gendaymtx -h -m 1 Santiago.wea > full_sky.skv
cat Workplanes/WP.pts | rcontrib -e MF:1 -f reinhart.cal -b rbin -bn
Nrbins -m skymat -n 4 -I -ab 8 -ad 50000 -lw 2e-5 -dc 1 -dt 0 -dj 0 -st 1
-ss 0 white_octree.oct > DC1.mtx
dctimestep -n 1 DC1.mtx full_sky.skv > DC1.lux#Direct sun from patches, to be sustracted
xform -m scene.rad > black_scene.rad
oconv Materials/* black.rad black_scene.rad windows.rad white.sky >
black_octree.oct
gendaymtx -h -m 1 -d Santiago.wea > sun_only_sky.skv
cat Workplanes/WP.pts | rcontrib -e MF:1 -f reinhart.cal -b rbin -bn
Nrbins -m skymat -n 4 -I -ab 1 -ad 50000 -lw 2e-5 -dc 1 -dt 0 -dj 0 -st 1
-ss 0 black_octree.oct > DC2.mtx
dctimestep -n 1 DC2.mtx sun_only_sky.skv > DC2.lux#Sharp sun addition
oconv Materials/* black.rad black_scene.rad windows.rad suns.rad >
suns_octree.oct
gendaymtx -h -m 6 -5 Santiago.wea > direct_sun_M6_sky.skv
cat Workplanes/WP.pts | rcontrib -n 4 -I -ab 1 -ad 50000 -lw 2e-5 -dc 1
-dt 0 -dj 0 -st 1 -ss 0 -e MF:6 -f reinhart.cal -b rbin -bn Nrbins -m solar
suns_octree.oct > directsun.mtx
dctimestep -n 1 directsun.mtx direct_sun_M6_sky.skv > directSun.luxThe results are horrible!!! So, any help would be awesome!!! THANKS
--
*Germán Molina L.*
Ingeniero Trainee
Hunter Douglas Chile S.A.
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