On 9/16/2016 9:33 AM, William F Pokorny wrote:
> Argh. Sorry Jim. I got the wording for what I believe is the lower-most
> bound for the inner radius wrong. I had in my head only to offer general
> guidance there.

like i said ... no worries

>
> Adding the full equations is an option I guess - we do for other objects
> in the docs. If we stick with a general description, we could build on
> what you, Jérôme, wrote with perhaps:

sticking with general description

>
> 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).
> Otherwise the minimum inner radius is larger than half the distance
> between base and cap point. Any time the inner radius given is too
> small, the code uses the minimum radius over the specified one and
> issues a warning.

i /think/ i've got it this time: 
http://wiki.povray.org/content/Reference:Lemon

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