POV-Ray : Newsgroups : povray.advanced-users : Bezier spline deformation Server Time
22 Nov 2024 00:17:34 EST (-0500)
  Bezier spline deformation (Message 21 to 23 of 23)  
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From: Bald Eagle
Subject: Re: Bezier spline deformation
Date: 22 Mar 2023 18:55:00
Message: <web.641b8701122e7e3a1f9dae3025979125@news.povray.org>
I plotted out the points following the standard cubic equations described by the
Bernstein polynomials and got the attached shape.   So --- it looks to me like
the other software package is doing something strange?

Maybe try another program, or an online tool to see what kinds of results you
get?

- BW


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From: yesbird
Subject: Re: Bezier spline deformation
Date: 23 Mar 2023 02:49:56
Message: <2e9fd20a-4f14-56dd-aaf5-71ec3c16d302@gmail.com>
On 23/03/2023 01:53, Bald Eagle wrote:
> So --- it looks to me like
> the other software package is doing something strange?
As I see your plot also not matching to POV version - vertical size is
less.
> 
> Maybe try another program, or an online tool to see what kinds of results you
> get?
Here I've posted Matlab version - it matches to C4D:
news://news.povray.org:119/b44b0560-ea7d-f389-12d8-47cbc7d21017@gmail.com
--
YB


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From: Bald Eagle
Subject: Re: Bezier spline deformation
Date: 23 Mar 2023 06:30:00
Message: <web.641c2940122e7e3a1f9dae3025979125@news.povray.org>
yesbird <sya### [at] gmailcom> wrote:

> As I see your plot also not matching to POV version - vertical size is
> less.

Well, your first data set is 1/10th the size of what you later posted as a
prism.  Here's my shape based on your most recent dataset post, and your
original prism simply scaled by 10.

So, I mean, to my eye, they "match" close enough for what we're talking about
here.

> Here I've posted Matlab version - it matches to C4D:
> news://news.povray.org:119/b44b0560-ea7d-f389-12d8-47cbc7d21017@gmail.com

linky no worky.  But I did see your past pasts, and the other one is indeed
rounder.

Puzzling indeed.  Troubling as well.


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