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

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