[Radiance-general] comparing RTRACE vs DAYSIM Daylight Coefficients

[CHI-German Molina]

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    0

skymat 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% reflectance

skyfunc glow skyglow
0
0
4   1   1   1   0

skyglow 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.lux



The results are horrible!!! So, any help would be awesome!!! THANKS


-- 
*Germán Molina L.*
Ingeniero Trainee
Hunter Douglas Chile S.A.
Celular +569 89224445

-- 


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