[Radiance-general] Re: Cumulative calculations of irradiance

[John Mardaljevic]

Hi Ivan,
> 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?

If I understand the question correctly, It's more efficient to render  
using a 'sky' file that contains both the cumulative sun (e.g. many  
suns) and the cumulative sky [1] contribution since the inter- 
reflection calculation will determine the indirect sun component as  
well and the direct + indirect sky components.
-John
[1] Cumulative sky could be based on either brightdata format or an  
aggregated 'image'.
-----------------------------------------------
Dr. John Mardaljevic
Senior Research Fellow
Institute of Energy and Sustainable Development
De Montfort University
The Gateway
Leicester
LE1 9BH, UK
+44 (0) 116 257 7972
+44 (0) 116 257 7981 (fax)

jm at dmu.ac.uk
http://www.iesd.dmu.ac.uk/~jm