On 14/12/2017 02:07, Bald Eagle wrote:
> I'm interested in trying Alain's clever suggestions - they would likely give a
> much sharper point at the bottom of the central shape.

Got me thinking about Le Forgeron's lemon in hgpovray.

https://my.smeuh.org/photos/details/1412/

-- 

Regards
     Stephen

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