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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? 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?
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"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...
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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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"David Kraics" <bar### [at] aolcom> wrote:
> 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.
In addition to the other suggestions, you could use a lathe object:
http://www.povray.org/documentation/3.7.0/r3_4.html#r3_4_5_1_8
which takes a 2D curve and rotates it around an axis. If you don't fancy
creating the curves by hand, you could use Inkscape (https://inkscape.org/)
which can export curves as POV-Ray splines. These can then be pasted into your
scene files.
Bill
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"Bill Pragnell" <bil### [at] hotmailcom> wrote:
> In addition to the other suggestions, you could use a lathe object:
Ah, yes, and the SOR object as well.
Plus there's EP-Spline
https://agalena.nfshost.com/b1/software/epspline-prism-and-lathe-editor/
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Le 2019-09-25 à 21:08, David Kraics a écrit :
> 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? 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?
>
>
What about a sphere_sweep ?
In some cases, using blobs can be the way to go.
If all else fails, there are bicubic patches and meshes that can be used.
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