Vwrays-Rtcontrib generated image agreement with Rpict image

Hi all,

I've been using rtcontrib to look at different window contributions in a space under an overcast sky. When I 'pcomb' the resultant images and compare the illuminance values to an image generated with 'rad' I get light levels 1/3 of what I'm getting in the rad generated image.

For the rtcontrib routine I used:
oconv mat.rad d_cie.rad d_c1.rad d_c2.rad d_c3.rad d_c5.rad d_c6.rad d_c7.rad d_c9.rad d_c130.rad d_c131.rad d_c132.rad d_c133.rad d_c134.rad d_c255.rad > punch_40.oct

vwrays -ff -x 1024 -y 1024 -vf plan_1.vf | rtcontrib -ffc -I+ -V+ `vwrays -d -x 1024 -y 1024 -vf plan_1.vf` @options.opt -o images/plan1_%s.pic -M glass.txt punch_40.oct

The parameters set in the 'options.opt' file are:
-n 2
-ab 5
-ad 8000
-as 2000
-ar 800
-dt 0
-dc 1
-ds .2
-lw .000001

the "glass.txt' file contains the different glass geometries:
d_c130
d_c131
d_c132
d_c133

For the 'pcomb' routine:
pcomb -o plan_1_d_c130.hdr -o plan_1_d_c131.hdr -o plan_1_d_c132.hdr -o plan_1_d_c133.hdr > plan_1_all_glass.hdr

For the 'rad' routine:
rpict -t 60 -vu 0 0 1 -vf plan_1.vf -x 2700 -y 2700 -dp 4096 -ar 323 -ms 0.31 -ds .2 -dt .05 -dc .75 -dr 3 -sj 1 -st .01 -aa .1 -ad 1536 -as 768 -av 0 0 0 -lr 12 -lw .0005 -ab 3 -i -ps 3 -pt .04 -o plan_1.unf d.oct

I'm sure I'm missing somethng, but am just not sure what.

Thanks!

Chris

Christian Humann ~ Associate
LOISOS + UBBELOHDE
- - - - - - - - - - - - - - - - - - - - - - - - - - -
1917 Clement Avenue Building 10A
Alameda, CA 94501 USA
- - - - - - - - - - - - - - - - - - - - - - - - - - -
510 521 3800 VOICE
510 521 3820 FAX
- - - - - - - - - - - - - - - - - - - - - - - - - - -
www.coolshadow.com

Hi Chris,

Could the -I+ option you're giving to rtcontrib be substituted with the -i+ option? The former would compute an array of irradiance values surrounding your -vp setting, rather than an irradiance image of intersected surfaces. I wouldn't think the images would look very similar in this case. Did you compare the appearance of rtcontrib -I+ versus rpict -i?

-Greg

···

From: Chris Humann <[email protected]>
Date: June 11, 2010 12:51:28 PM PDT

Hi all,

I've been using rtcontrib to look at different window contributions in a space under an overcast sky. When I 'pcomb' the resultant images and compare the illuminance values to an image generated with 'rad' I get light levels 1/3 of what I'm getting in the rad generated image.

For the rtcontrib routine I used:
oconv mat.rad d_cie.rad d_c1.rad d_c2.rad d_c3.rad d_c5.rad d_c6.rad d_c7.rad d_c9.rad d_c130.rad d_c131.rad d_c132.rad d_c133.rad d_c134.rad d_c255.rad > punch_40.oct

vwrays -ff -x 1024 -y 1024 -vf plan_1.vf | rtcontrib -ffc -I+ -V+ `vwrays -d -x 1024 -y 1024 -vf plan_1.vf` @options.opt -o images/plan1_%s.pic -M glass.txt punch_40.oct

The parameters set in the 'options.opt' file are:
-n 2
-ab 5
-ad 8000
-as 2000
-ar 800
-dt 0
-dc 1
-ds .2
-lw .000001

the "glass.txt' file contains the different glass geometries:
d_c130
d_c131
d_c132
d_c133

For the 'pcomb' routine:
pcomb -o plan_1_d_c130.hdr -o plan_1_d_c131.hdr -o plan_1_d_c132.hdr -o plan_1_d_c133.hdr > plan_1_all_glass.hdr

For the 'rad' routine:
rpict -t 60 -vu 0 0 1 -vf plan_1.vf -x 2700 -y 2700 -dp 4096 -ar 323 -ms 0.31 -ds .2 -dt .05 -dc .75 -dr 3 -sj 1 -st .01 -aa .1 -ad 1536 -as 768 -av 0 0 0 -lr 12 -lw .0005 -ab 3 -i -ps 3 -pt .04 -o plan_1.unf d.oct

I'm sure I'm missing somethng, but am just not sure what.

Thanks!

Chris

Thanks Greg, that was the problem and the needle I was looking for. I don't think I would have figured that out anytime soon.

Best,
Chris
Christian Humann ~ Associate
LOISOS + UBBELOHDE
- - - - - - - - - - - - - - - - - - - - - - - - - - -
1917 Clement Avenue Building 10A
Alameda, CA 94501 USA
- - - - - - - - - - - - - - - - - - - - - - - - - - -
510 521 3800 VOICE
510 521 3820 FAX
- - - - - - - - - - - - - - - - - - - - - - - - - - -
www.coolshadow.com

···

On Jun 11, 2010, at 1:42 PM, Greg Ward wrote:

Hi Chris,

Could the -I+ option you're giving to rtcontrib be substituted with the -i+ option? The former would compute an array of irradiance values surrounding your -vp setting, rather than an irradiance image of intersected surfaces. I wouldn't think the images would look very similar in this case. Did you compare the appearance of rtcontrib -I+ versus rpict -i?

-Greg

From: Chris Humann <[email protected]>
Date: June 11, 2010 12:51:28 PM PDT

Hi all,

I've been using rtcontrib to look at different window contributions in a space under an overcast sky. When I 'pcomb' the resultant images and compare the illuminance values to an image generated with 'rad' I get light levels 1/3 of what I'm getting in the rad generated image.

For the rtcontrib routine I used:
oconv mat.rad d_cie.rad d_c1.rad d_c2.rad d_c3.rad d_c5.rad d_c6.rad d_c7.rad d_c9.rad d_c130.rad d_c131.rad d_c132.rad d_c133.rad d_c134.rad d_c255.rad > punch_40.oct

vwrays -ff -x 1024 -y 1024 -vf plan_1.vf | rtcontrib -ffc -I+ -V+ `vwrays -d -x 1024 -y 1024 -vf plan_1.vf` @options.opt -o images/plan1_%s.pic -M glass.txt punch_40.oct

The parameters set in the 'options.opt' file are:
-n 2
-ab 5
-ad 8000
-as 2000
-ar 800
-dt 0
-dc 1
-ds .2
-lw .000001

the "glass.txt' file contains the different glass geometries:
d_c130
d_c131
d_c132
d_c133

For the 'pcomb' routine:
pcomb -o plan_1_d_c130.hdr -o plan_1_d_c131.hdr -o plan_1_d_c132.hdr -o plan_1_d_c133.hdr > plan_1_all_glass.hdr

For the 'rad' routine:
rpict -t 60 -vu 0 0 1 -vf plan_1.vf -x 2700 -y 2700 -dp 4096 -ar 323 -ms 0.31 -ds .2 -dt .05 -dc .75 -dr 3 -sj 1 -st .01 -aa .1 -ad 1536 -as 768 -av 0 0 0 -lr 12 -lw .0005 -ab 3 -i -ps 3 -pt .04 -o plan_1.unf d.oct

I'm sure I'm missing somethng, but am just not sure what.

Thanks!

Chris

_______________________________________________
Radiance-general mailing list
[email protected]
http://www.radiance-online.org/mailman/listinfo/radiance-general