> Works fine... as long as I adjust the scale value according to Sedna's 
> distance to the Sun rather than to the camera-Sedna distance. If I try 
> the latter (i. e. insert 10000 instead of 975.56*AU, which is about 14 
> billions), the illuminated half of the Sedna dummy sphere appears 
> terribly grainy!

  This is most probably just a limitation with 64-bit floating point
values. (Less probably a bug.)
  If that is indeed the reason, then there's little one can do about it.

-- 
                                                          - Warp

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