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

[Chris Humann]

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
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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 <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
>
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