Op 26/09/2019 om 12:26 schreef Bald Eagle:
> 
> "David Kraics" <bar### [at] aolcom> wrote:
>> Hi there. Over the many years of playing with POVray, I have often tried to
>> recreate things that require a certain object. I want to go from a cylinder to a
>> cone, but I want it to be tapered in, rather than a straight cut into the angle
>> of the cone. Sort of like going from cylinder to half-sphere to cone. Does this
>> make sense?
> 
> Convex, concave, or sigmoid (both - one, then the other)?
> 
>> Maybe this helps to picture what I had in mind. Right now I want to
>> recreate a Navy submarine. The shape of the sub transits smoothly from a
>> cylinder to ending in a cone shape in the rear, without a sharp change in angle.
>> Anyone have any suggestions?
> 
> Spindle of a spindle torus, difference a "horn" torus away from a cylinder
> https://en.wikipedia.org/wiki/Torus
> 
> non-linearly scaled sphere,
> 
> http://www.econym.demon.co.uk/isotut/substitute.htm
> 
> the lemon
> 
> http://wiki.povray.org/content/Reference:Lemon
> 
> isosurface,
> 
> Do any of these shapes look interesting?
> http://www.econym.demon.co.uk/isotut/builtin2.htm  (and subsequent pages)
> 
> use intersecting spheres around an axis to make a sort of 3D lemniscate (if
> that's not redundant with any of the above...
> 
> 

I would add to that the 'ovus' object from the basic round objects 
library in POV-Ray.

[aside]
This is typically a case where the Moray program would come in handy...
[/aside]

-- 
Thomas

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