[Radiance-general] Re: illum maximum radius for shadow testing?

[Greg Ward]

The short answer is 'no,' the reason being that you only need to turn  
an object into an "illum" if its contribution is significant, which is  
the opposite of the reason you would want to turn something into a  
"glow."  If its influence is local, then treating it as whatever it is  
in the default calculation (using "glow" with an effective distance of  
0) should work fine in the ambient calculation.  Naturally, there are  
cases where it doesn't quite.

Best,
-Greg

> From: Iebele Abel <iabel at iebele.nl>
> Date: June 4, 2010 3:57:55 AM PDT
>
> Hi all,
>
> Can the illum primitive be set to a maximum radius for shadow  
> testing (like the spotlight primitive) ?
>
> My best,
>
> Iebele
>