[Radiance-general] estimating -av values, color

[Carsten Bauer]

Hi Lars,

you can think of the av value being a substitution for the rest amount 
of light hovering in the room which gets ommitted in your calculations 
when you follow
ambient rays only a certain number of bounces deep, instead of following 
them infinitely deep.  And if you have a neutral source, but red walls, 
the  diffuse indirect light will be red, and so should also be the av 
setting, to be a correct compensation...

So generally your're right in considering the color bias of the scene 
also for the constant ambient approximation. But definitely also keep in 
mind  Jacks remark on -av affecting all objects...

-cb