[Radiance-general] Question about -av parameter

[Greg Ward]

Hi Marija,

If the ambient value looks too high, then it probably is too high.  If 
you need an ambient value for the interior, the procedure in the book 
should be followed on an interior view.

You should also investigate the "compamb" script:

	http://radsite.lbl.gov/radiance/man_html/compamb.1.html

This script relies on an operational rad input file, which it uses to 
generate the ambient values for several views, setting -av 0 0 0.  It 
then averages the ambient values computed by rpict into a suitable -av 
setting, which it appends to your rad input file.  This is the 
"scientific" way to set -av properly.

-Greg

> From: marija cvetkovic <marica at elfak.ni.ac.yu>
> Date: August 7, 2004 5:46:59 AM PDT
>
> Hello,
>
> I have one simple question : how can I know which -av parameter value 
> is most
> accurate for a scene.
>
> I am rendering scene inside museum building, and I tried to follow 
> procedure
> for -av and EXPOSURE setting from RWR book. Resulting ambient values 
> are
> something around 5, but I think it is too high for interior.
>
> Since I have to compare real and simulated values how can I know which 
> -av
> value is good enough?
>
> Thanks,
> Marija Cvetkovic
> cveleglg at bankerinter.net