On Thu, 22 May 2008 08:28:52 +0200, Jan Dvorak
<jan### [at] centrumcz> wrote:

>-since double precision is only 16 digits you cannot have objects with 
>scales differing by more than 8 digits.
>-if the camera is inside the sphere you must make it hollow or inverse.
>-such object will probably be traced by every ray. This has performance 
>implications of using complicated objects (an unlikely need)

Thanks Jan,
	I was just wondering. I am using a large sphere for a
skysphere as I want a planet to be obscured slightly by clouds and a
skysphere will not do this. Incidentally I had to add the hollow
keyword to the sphere and the union it was in to get rid of the
warning.
-- 

Regards
     Stephen

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