[Radiance-general] Rtcontrib and tregsamp.dat file

[Greg Ward]

Hi George,

What part is unclear to you?  The second stage is a kind of forward  
ray-tracing to determine the relationship between sky patches and  
outgoing directions in each of the ceiling "sources."

-Greg

> From: George Makrithanasis <nofunciona_g at yahoo.gr>
> Date: March 12, 2009 7:56:27 AM PDT
>
> Dear all,
>
> I was looking the rtcontutor example of the Radiance 2006 Workshop  
> and the examples of the R3.8. I have a question for the
> second pass of rtcontrib. If I understand correctly, the input for  
> rtcontrib is the tregsamp.dat
>  file but modified by rcalc. The modofication applies to the rays  
> origin which from 0,0,0 I think
> that they are distributed 1.7m off the facade of the building. It  
> looks that the directions
> remain the same. In adittion, if one tries to actually plot the  
> file it looks that all these rays are directed to the facade of the  
> building.
>
> The description for this step within the readme file was "The  
> second stage computes the incidence of sky
> illumination on these portholes, and the results are combined".
>
> Could somebody throw a little bit of light on this step as I can  
> not figure out the logic behind. Hopefully,
> I have not misunderstood what's going on and this email does make a  
> bit of sense.
>
> Cheers,
>
> George