Le 19-05-28 à 14:52, Mike Horvath a écrit :
> This tutorial about radiosity:
> 
> http://wiki.povray.org/content/HowTo:Use_radiosity#Step_5:_Find_Your_Error_Bound 
> 
> 
> says:
> 
>  > Sometimes radiosity can cause artifacts, one of the most common 
> causes of artifacts is infinite radiosity rays. A good rule is to place 
> any radiosity scene inside a large inverse sphere to avoid any ray 
> colliding with the background or sky_sphere.
> 
> What is an inverse sphere? And how is it useful/beneficial in this 
> situation? Thanks.
> 
> 
> Michael

It can be a sphere with the «inverse» attribute, or a sphere with the 
hollow attribute.

The use of inverse or hollow is to allow the use of fog and media.

In my experience, I have never encountered any case where infinite rays 
have caused any artifacts.

My guess is it's a leftover from the early radiosity implementation that 
still had a max_distance setting that imposed a cutoff distance when 
testing for radiosity samples.

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