"ARTis" <art### [at] aaaapollolv> wrote...
> Are those shadow rings normal? I tryed to incrase the radiosity settings,
> but that only reduces the effect a bit and takes vary long to render.
There
> are no problems with perspective camera.

Some of the math in the radiosity calculations do assume a perspective
camera.  It uses some approximations to decrease accuracy as rays get
farther away from the camera.  This is done to speed up rendering.  You
should still be able to achieve good results with other cameras, but the
render time might be slightly affected.  (Note that I say "slightly"
affected... it should be possible to get reasonable results without it
taking too much longer.)

Eventually we might be able to incorporate ray-differentials to replace this
approximation with a true representation, but that is far in the future.

-Nathan

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