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19 Apr 2024 12:58:45 EDT (-0400)
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From: Bald Eagle
Subject: Re: Bezier-patch torus
Date: 19 Sep 2018 12:30:00
Message: <web.5ba278c2dc5d6572c437ac910@news.povray.org>
Thanks, I'm never quite sure what to use for an image map, but this one worked
out fairly well.


Technical aside:

While working on this, and reviewing the code, I noticed that the bicubic_patch
block doesn't allow trailing commas in the list of the control points.
Is this something that can be addressed without too much hassle?


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From: clipka
Subject: Re: Bezier-patch torus
Date: 19 Sep 2018 15:37:29
Message: <5ba2a579$1@news.povray.org>
Am 19.09.2018 um 18:26 schrieb Bald Eagle:
> Thanks, I'm never quite sure what to use for an image map, but this one worked
> out fairly well.
> 
> 
> Technical aside:
> 
> While working on this, and reviewing the code, I noticed that the bicubic_patch
> block doesn't allow trailing commas in the list of the control points.
> Is this something that can be addressed without too much hassle?

Yes, that could be done. Actually it would simplify the parser for
bicubic patch.

I'm not even sure why an extra comma explicitly forbidden - it's rather
unusual style in POV-Ray. Maybe it was implemented before commas were
made always optional, or the person implementing this piece of the
parser didn't know that.

I'm also looking at the matrix syntax while I'm at it.


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From: Alain
Subject: Re: Bezier-patch torus
Date: 19 Sep 2018 17:37:54
Message: <5ba2c1b2@news.povray.org>
Le 18-09-18 à 15:11, Bald Eagle a écrit :

> So - here's a coil wrapping around a torus 5 times.   Super easy as a sphere
> weep and parametric or isosurface or polynomial...   but if the torus is
> deformed...
> 
5 times around ? Then, why to I count 12 rotations ?


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From: Bald Eagle
Subject: Re: Bezier-patch torus
Date: 19 Sep 2018 18:20:00
Message: <web.5ba2cabcdc5d6572458c7afe0@news.povray.org>
Alain <kua### [at] videotronca> wrote:
> Le 18-09-18 à 15:11, Bald Eagle a écrit :
>
> > So - here's a coil wrapping around a torus 5 times.   Super easy as a sphere
> > weep and parametric or isosurface or polynomial...   but if the torus is
> > deformed...
> >
> 5 times around ? Then, why to I count 12 rotations ?

We use common core principles to guess at the floating-point values, and when
you do that, 5 = 12 for sufficiently large values of 5.


No really, I started off with 5, and decided it looked better with 12.

It was a counting test - you passed!   :D


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From: Thomas de Groot
Subject: Re: Bezier-patch torus
Date: 20 Sep 2018 03:00:43
Message: <5ba3459b$1@news.povray.org>
On 20-9-2018 0:16, Bald Eagle wrote:
> Alain <kua### [at] videotronca> wrote:
>> Le 18-09-18 à 15:11, Bald Eagle a écrit :
>>
>>> So - here's a coil wrapping around a torus 5 times.   Super easy as a sphere
>>> weep and parametric or isosurface or polynomial...   but if the torus is
>>> deformed...
>>>
>> 5 times around ? Then, why to I count 12 rotations ?
> 
> We use common core principles to guess at the floating-point values, and when
> you do that, 5 = 12 for sufficiently large values of 5.
> 
> 
> No really, I started off with 5, and decided it looked better with 12.
> 
> It was a counting test - you passed!   :D
> 

I still see 5... :-0

-- 
Thomas


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From: Stephen
Subject: Re: Bezier-patch torus
Date: 20 Sep 2018 03:31:07
Message: <5ba34cbb@news.povray.org>
On 20/09/2018 08:00, Thomas de Groot wrote:
> On 20-9-2018 0:16, Bald Eagle wrote:
>> Alain <kua### [at] videotronca> wrote:
>>> Le 18-09-18 à 15:11, Bald Eagle a écrit :
>>>

>>>> a sphere

>>>> torus is
>>>> deformed...
>>>>
>>> 5 times around ? Then, why to I count 12 rotations ?
>>
>> We use common core principles to guess at the floating-point values, 
>> and when
>> you do that, 5 = 12 for sufficiently large values of 5.
>>
>>
>> No really, I started off with 5, and decided it looked better with 12.
>>

>>
> 
> I still see 5... :-0
> 

Mod(12,7) ??
Adjust your viewpoint. ;-)


-- 

Regards
     Stephen


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From: Thomas de Groot
Subject: Re: Bezier-patch torus
Date: 20 Sep 2018 07:19:27
Message: <5ba3823f$1@news.povray.org>
On 20-9-2018 9:30, Stephen wrote:
> On 20/09/2018 08:00, Thomas de Groot wrote:
>> On 20-9-2018 0:16, Bald Eagle wrote:
>>> Alain <kua### [at] videotronca> wrote:
>>>> Le 18-09-18 à 15:11, Bald Eagle a écrit :
>>>>

>>>>> a sphere

>>>>> torus is
>>>>> deformed...
>>>>>
>>>> 5 times around ? Then, why to I count 12 rotations ?
>>>
>>> We use common core principles to guess at the floating-point values, 
>>> and when
>>> you do that, 5 = 12 for sufficiently large values of 5.
>>>
>>>
>>> No really, I started off with 5, and decided it looked better with 12.
>>>

>>>
>>
>> I still see 5... :-0
>>
> 
> Mod(12,7) ??
> Adjust your viewpoint. ;-)
> 
> 
When I squint I see 12... ;-)

-- 
Thomas


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From: B  Gimeno
Subject: Re: Bezier-patch torus
Date: 24 Sep 2018 05:20:00
Message: <web.5ba8aabfdc5d65728e45b0fa0@news.povray.org>
"Bald Eagle" <cre### [at] netscapenet> draw:


>>> "a kind of strange toroidal form of life"

Looks yummi to me.

B.Gimeno

pd. Seems that everything I look is yummi at lunch time.


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From: jr
Subject: Re: Bezier-patch torus
Date: 27 Sep 2018 10:30:00
Message: <web.5bace90fdc5d6572b0d4fc1e0@news.povray.org>
hi,

"Bald Eagle" <cre### [at] netscapenet> wrote:
> Alain <kua### [at] videotronca> wrote:
> > Le 18-09-18 à 15:11, Bald Eagle a écrit :
> > > So - here's a coil wrapping around a torus 5 times.   Super easy as a sphere
> > > weep and parametric or isosurface or polynomial...   but if the torus is
> > > deformed...
> > 5 times around ? Then, why to I count 12 rotations ?
> We use common core principles to guess at the floating-point values, and when
> you do that, 5 = 12 for sufficiently large values of 5.
>
> No really, I started off with 5, and decided it looked better with 12.

phew.  I'm so glad I read this.  :-)

fwiw, I thought the image posted Sep 4th cool, the "crumpled" surface.  it looks
a little like a kitchen/tea towel dropped, if the texture was more "terry
cloth".


regards, jr.


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From: Sven Littkowski
Subject: Re: Bezier-patch torus
Date: 17 Oct 2018 11:47:43
Message: <5bc7599f$1@news.povray.org>
This looks similar to the shape of the plasma stream inside a
Wendelstein fusion reactor (check online). Amazing.

---

http://www.avg.com


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