[Radiance-general] rtcontrib

[Santiago Torres]

Hello,

I've been trying to use daylight coefficients with rtcontrib and I  
have a couple of questions.
I made images with the contribution of each sky patch, but the images  
look quite noisy, and if I combine them I don`t get the same as if I  
was rendering the scene altogether.
The command I used is like this:

vwrays -ff -x 500 -y 500 -vf vint.vf | rtcontrib -ffc `vwrays -d -x  
500 -y 500 -vf vint.vf` -ab 5 -ad 2048 -as 1024 -b tbin -o c_%d.pic - 
m skyglow -f tregenza_h.cal scene.oct

If necessary I can post some images, but probably it`s something  
obvious I`m missing here...

My second question is regarding the calculation of model skies (like  
Perez) with the rtcontrib results. Perez sky gives the luminance  
value at a certain point, but I guess in order to multiply the  
contribution of a certain section of the sky, I need to integrate the  
luminance values inside that section. Is this correct? Can anyone  
point me to any reference where this might be explained more? Any  
ideas about how to implement this in a script?
Thank you in advance. Best regards,

Santiago