POV-Ray : Newsgroups : povray.binaries.images : SOR:nurbs or not? Server Time
1 Jul 2024 00:59:21 EDT (-0400)
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From: And
Subject: Re: SOR:nurbs or not?
Date: 6 Aug 2015 00:55:01
Message: <web.55c2e86f795308e1ed1a9b950@news.povray.org>
"LanuHum" <Lan### [at] yandexru> wrote:
> Why there was a question?
> If I have the correct visualization of a curve in the editor, I can create
> Constructive Solid Geometry.
> On the picture green prism (bezier_spline) and red curve (bezier_spline).
> If sphere_sweep, also as the prism, supported bezier_spline, it is possible to
> write:
> difference{
>     object{prism}
>     object(sphere_sweep}}
>
> I can't make it.
> I can't reel up a spiral on SOR.
> I can SOR and sphere_sweep to model as nurbs, but to write down as cubic.
> But, if to displace control points of a curve on Z, the geometry will be broken,
> but control is absent also correction not to make.

If bezier spline is nothing else than a cubic spline, maybe I can write a macro
for converting.


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From: scott
Subject: Re: SOR:nurbs or not?
Date: 6 Aug 2015 03:23:37
Message: <55c30b79$1@news.povray.org>
> If bezier spline is nothing else than a cubic spline, maybe I can write a macro
> for converting.

http://www.joshuarenglish.com/cyclopedia/bezier.html


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From: And
Subject: Re: SOR:nurbs or not?
Date: 6 Aug 2015 11:40:00
Message: <web.55c37f32795308e1ed1a9b950@news.povray.org>
scott <sco### [at] scottcom> wrote:
> > If bezier spline is nothing else than a cubic spline, maybe I can write a macro
> > for converting.
>
> http://www.joshuarenglish.com/cyclopedia/bezier.html

Uh huh,.. okay, I will try it.


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From: LanuHum
Subject: Re: SOR:nurbs or not?
Date: 6 Aug 2015 13:25:01
Message: <web.55c39752795308e17a3e03fe0@news.povray.org>
"And" <49341109@ntnu.edu.tw> wrote:

>
> If bezier spline is nothing else than a cubic spline, maybe I can write a macro
> for converting.

Thanks!


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