[Radiance-general] Predicting Patch-based diffuse Irradiance values

[Greg Ward]

Hi Sokol,

If you are OK using a Tregenza (or Reinhart) sky subdivision, then you can use rtcontrib to compute all the patch contributions at once.  A complete explanation of the process is provided in Axel Jacobs' tutorial, with additional methods for handling BSDFs described by Andy McNeil.

Axel's tutorial:	http://tinyurl.com/884plcj

Andy's tutorial:	http://docs.google.com/View?id=dfjk2vdh_79ff7nxwgq

Hopefully,  you can figure it out from these, but feel free to ask more specific questions.

Best,
-Greg

> From: sokol dervishi <dervishi_sokol at yahoo.com>
> Date: July 12, 2012 4:11:12 AM PDT
> 
> Dear All, 
> 
> I wanted to ask a question related to the prediction of the diffuse horizontal (or vertical contribution) of a particular patch of the sky ( with a specific patch altitude, solid angle, patch azimuth). 
> 
> I am developing a patch-based Irradiance model and I wanted to compare with other models in Radiance , e.g.Perez Model. I know How to calculate the diffuse horizontal, or any titled surface of the whole sky, but in my case I wanted to compare in a patch-based mode. So I need to simulate a patch-based contribution of diffuse component in horizontal or any titled surface. 
> 
> I thank you in advance, 
> 
> 
> Regards, 
> 
> Sokol