[Radiance-general] Re: Vwrays-Rtcontrib generated image agreement with Rpict image

[Greg Ward]

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 <chris at coolshadow.com>
> 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