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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