On 07/21/2014 10:15 AM, Bald Eagle wrote:
> Changing to :
>
> contained_by { sphere{0, 1.1} }
> max_gradient 30
> accuracy 0.1
>
> Gave me a red sphere after 5 min.
>
Have your tried working from the source code Mike provides via 
download-able zip at the bottom of the page: 
http://www.econym.demon.co.uk/isotut/real.htm ?

His Apple.pov example works without trouble for me in < 15 seconds. No 
AA at default povray resolution.

Bill P.

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