POV-Ray : Newsgroups : povray.binaries.images : nice knots Server Time: 23 Oct 2019 02:02:30 GMT
  nice knots (Message 1 to 9 of 9)  
From: Norbert Kern
Subject: nice knots
Date: 20 Sep 2019 16:00:01
Message: <web.5d84f64ca8ed7c63839d843b0@news.povray.org>
Hello,

there is a site with nice knots together with their pov source -
http://knotilus.math.uwo.ca/gallery/ .

Source of this interpretation can be found here -
http://news.povray.org/povray.text.scene-files/message/%3Cweb.5d84f504a8ed7c63839d843b0%40news.povray.org%3E/#%3Cweb.5d
84f504a8ed7c63839d843b0%40news.povray.org%3E


Regards,
Norbert Kern


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From: Jim Holsenback
Subject: Re: nice knots
Date: 20 Sep 2019 23:48:55
Message: <5d856567$1@news.povray.org>
On 9/20/19 11:54 AM, Norbert Kern wrote:
> Hello,
> 
> there is a site with nice knots together with their pov source -
> http://knotilus.math.uwo.ca/gallery/ .
> 
> Source of this interpretation can be found here -
>
http://news.povray.org/povray.text.scene-files/message/%3Cweb.5d84f504a8ed7c63839d843b0%40news.povray.org%3E/#%3Cweb.5d
> 84f504a8ed7c63839d843b0%40news.povray.org%3E

oh wow ... very nice. like the back-drop too!


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From: Thomas de Groot
Subject: Re: nice knots
Date: 21 Sep 2019 06:52:35
Message: <5d85c8b3$1@news.povray.org>
Op 20/09/2019 om 17:54 schreef Norbert Kern:
> Hello,
> 
> there is a site with nice knots together with their pov source -
> http://knotilus.math.uwo.ca/gallery/ .
> 
> Source of this interpretation can be found here -
>
http://news.povray.org/povray.text.scene-files/message/%3Cweb.5d84f504a8ed7c63839d843b0%40news.povray.org%3E/#%3Cweb.5d
> 84f504a8ed7c63839d843b0%40news.povray.org%3E
> 

Great stuff! Thanks for the link indeed. And a beautiful 
interpretation/use. I must also hail the unexpected but creative use of 
Jonathan's pebbles. Very smart!

-- 
Thomas


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From: Norbert Kern
Subject: Re: nice knots
Date: 21 Sep 2019 14:15:01
Message: <web.5d86305637e75a1d839d843b0@news.povray.org>
Jim Holsenback <ash### [at] nospamcom> wrote:
>
> oh wow ... very nice. like the back-drop too!


yes I like th knots, but I wouldn't publish the image without the background.

Regards,
Norbert


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From: Norbert Kern
Subject: Re: nice knots
Date: 21 Sep 2019 14:30:01
Message: <web.5d86331437e75a1d839d843b0@news.povray.org>
Thomas de Groot <tho### [at] degrootorg> wrote:
>
> Great stuff! Thanks for the link indeed. And a beautiful
> interpretation/use. I must also hail the unexpected but creative use of
> Jonathan's pebbles. Very smart!
>
> --
> Thomas

Thanks,

it is a bit difficult to use the pebbles code.

It sometimes generates blck spots, when used with radiosity and together with
its normal via pigment_pattern.
Moreover you have to use a very low accuracy value io get the wanted effect -
here I used accuracy normal {... accuracy 0.001}. Render time is directly
related to the accuracy value here.

Regards,
Norbert


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From: Thomas de Groot
Subject: Re: nice knots
Date: 22 Sep 2019 06:54:08
Message: <5d871a90$1@news.povray.org>
Op 21/09/2019 om 16:26 schreef Norbert Kern:
> Thomas de Groot <tho### [at] degrootorg> wrote:
>>
>> Great stuff! Thanks for the link indeed. And a beautiful
>> interpretation/use. I must also hail the unexpected but creative use of
>> Jonathan's pebbles. Very smart!
>>
>> --
>> Thomas
> 
> Thanks,
> 
> it is a bit difficult to use the pebbles code.
> 
> It sometimes generates blck spots, when used with radiosity and together with
> its normal via pigment_pattern.
> Moreover you have to use a very low accuracy value io get the wanted effect -
> here I used accuracy normal {... accuracy 0.001}. Render time is directly
> related to the accuracy value here.
> 

Ah! Thanks for the info. The pebbles are still on my ToDo list of 
explorations, which probably means that I shall get to it in my 
afterlife ;-)

-- 
Thomas


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From: Bald Eagle
Subject: Re: nice knots
Date: 22 Sep 2019 16:05:00
Message: <web.5d879aeb37e75a1d4eec112d0@news.povray.org>
I used the pebbles code as a basis for my spheres in

http://news.povray.org/povray.binaries.images/thread/%3Cweb.5d3c5fe27be432e04eec112d0%40news.povray.org%3E/

Without the zoom and other features that make that scene work SO well, I had to
just make some extreme changes to the textures to give enough variation of the
spheres.

The majority of that scene is just texture definitions.

If you just highlight those and replaced them with some pseudocode

[list of pigments]
[list of textures]
[list of normals]

etc,

you can really pare down the scene to make it a lot more understandable.


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From: jr
Subject: Re: nice knots
Date: 24 Sep 2019 11:45:00
Message: <web.5d8a00c537e75a1dfeeb22ff0@news.povray.org>
hi,

(late to the party.  :-))

"Norbert Kern" <nor### [at] t-onlinede> wrote:

agree with others, the background and the woven "nylon" loops make a beguiling
image.

and the referenced site is seriously nice too, I loved the butterflies.  thanks.


regards, jr.


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From: Paolo Gibellini
Subject: Re: nice knots
Date: 2 Oct 2019 07:06:48
Message: <5d944c88@news.povray.org>
Norbert Kern wrote on 20/09/2019 17:54:
> Hello,
> 
> there is a site with nice knots together with their pov source -
> http://knotilus.math.uwo.ca/gallery/ .
> 
> Source of this interpretation can be found here -
>
http://news.povray.org/povray.text.scene-files/message/%3Cweb.5d84f504a8ed7c63839d843b0%40news.povray.org%3E/#%3Cweb.5d
> 84f504a8ed7c63839d843b0%40news.povray.org%3E
> 
> 
> Regards,
> Norbert Kern
> 

Very nice!
It remembers me the days I played with Knotplot 
(https://knotplot.com/rayt/).
See also the many interesting representations on the Knot Atlas (e.g. 
http://katlas.org/wiki/8_16 or http://katlas.org/wiki/T(9,4)).

Paolo


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