[Radiance-general] Re: Cumulative calculations of irradiance

[Iván Pajares Sánchez]

> One approach we have taken for cumulative irradiance studies is to add
> up the sky sources first and then do a single simulation with multiple
> skies.  There is a script that Francesco Anselmo developed (I can't
> recall the name or where it might be at the moment) that creates an
> annual sky based on a tmy2 weather file.  Not sure of your exact needs,
> but this might be an easier way to go about it.
>  
> Regards,
> Zack
>  
>   
Hi Zack,

I have tried creating a let's call it 'accumulated' sky (rendering 
multiple skies as a big cube, adding them with pcomb and then 
re-rendering with them as a light probe). However as I'm trying to 
include the direct component I generate the skies seperately without sun 
and the the suns on another file to render. This is leading to 
extraordinarily big numbers so I guess I have to, and please correct my 
mathematical language if wrong, normalize the numbers to get a 
manageable figure to work with, is this right?

I know I might be repeating what F. Anselmo and R. Compagnon have done 
with radmap and other scripts but I confess I enjoy learning this things 
'the hard way'...

So, to sum up:

Is it better to render the direct sun component on separate file to get 
all the sun's dayli/montly or yearly positions and render with all those 
direct sources plus the accumulated skies or to accumulate the skies 
with the sun and render?

Thanks to everybody for the feedback, it is outstanding the knowledge 
that flows through these emails...