Question about -av parameter

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
[email protected]

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 <[email protected]>
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
[email protected]