>>> I think I found the culprit: Your original SunPos() is divided by 1000!
>>>
>>> Thomas
>>
>> What line number is that at? I am having the same issue.
>>
>>
>> Mike
>>
>
> Goodness! That was three years ago! ;-)
>
> Without going over the whole discussion again, I guess it is about:
>
> // uncomment the below lines to have a physical sun in the scene with
> realistic brightness
> // and size (useful if using mcpov or perhaps radiosity?)
>  #local SunRadius = vlength(sp/1000)/214.8;
>  sphere{ sp/1000, SunRadius pigment{color rgb 1} finish{emission 1}
> no_shadow}
>
> Forgive me, I do not have the info freshly available in my mind anymore...

IIRC I think the consensus was that the 1000 factor (used on both lines) 
should be tweaked to make the sphere seem "far away" in your specific 
scene (but not too far away it causes accuracy issues). I think without 
the /1000 the sun is just too far away for the maths to cope when 
dealing with normal scenes of the order of a few metres.

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