On 9/16/2016 4:08 AM, Le_Forgeron wrote:
> The constraint on minimal inner_radius is really a dangerous beast:
>
>
> If base & cap radius are both 0, the inner_radius must be at least half
> the distance between base and cap point (it would be a sphere)
>
> So, as stated, the doc is false.
>
>
> If base & cap radius are identical, the minimal inner_radius would be
> sqrt( radius² + (distance/2)² ) , where distance is the length between
> base and cap points.
>
> when base & cap radius are different, it become nightmare (the exact
> equation is in the code, if you dare to want to know it).

no worries /but/ i wish you'd been as verbose with your previous post 
... however i see a bit of a conflict (perhaps i've characterized 
incorrectly) item 4 and 5 seem a bit murky or are the /both/ correct:

http://wiki.povray.org/content/Reference:Lemon

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