POV-Ray : Newsgroups : povray.general : Optimal planar tiling Server Time
18 Jun 2024 21:23:43 EDT (-0400)
  Optimal planar tiling (Message 1 to 5 of 5)  
From: Bald Eagle
Subject: Optimal planar tiling
Date: 10 Feb 2023 20:25:00
Message: <web.63e6ee633d46165d1f9dae3025979125@news.povray.org>
jr recently spammed me with a very interesting article, see:

https://www.quantamagazine.org/mathematicians-complete-quest-to-build-spherical-cubes-20230210

Therein, the authors reference J. Choe's tiling of a 2D plane with a hexagon
with minimal perimeter.

The original paper has a diagram with angles,

http://newton.kias.re.kr/~choe/fundamental.pdf

and another paper has the lengths of the sides.

https://www.researchgate.net/publication/267246574_Spherical_Cubes_Optimal_Foams_from_Computational_Hardness_Amplificat
ion

From that data, I was able to do a few rotations and use symmetry to getthe rest
of the points, and make a prism, which tiles the plane very nicely.

Next task is going to figure out how to make this into a pigment {function{}}
pattern, and color it like the inbuilt hexagon pattern.


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Attachments:
Download 'choehexagon.png' (90 KB)

Preview of image 'choehexagon.png'
choehexagon.png


 

From: Bald Eagle
Subject: Re: Optimal planar tiling
Date: 10 Feb 2023 20:35:00
Message: <web.63e6f083b0df30fc1f9dae3025979125@news.povray.org>
Closely related to this,

during my search for more information on the Choe hexagonal tiling, I found the
attached image, which I think would make for an excellent heightfield.

Also, these tilings in 2D and 3D space are relaxed Voronoi foams.

Perhaps this adds fuel to the Voronoi variations.

And of course, since there is a 3D space partitioning in the 2nd paper, it would
be very interesting indeed to see what sort of surface pattern would result if
that were implemented in POV-Ray.


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From: yesbird
Subject: Re: Optimal planar tiling
Date: 10 Feb 2023 21:40:00
Message: <web.63e6ff86b0df30fc768b900310800fb2@news.povray.org>
Hi,
> And of course, since there is a 3D space partitioning in the 2nd paper, it would
> be very interesting indeed to see what sort of surface pattern would result if
> that were implemented in POV-Ray.

Really, tiling is very attractive. Surprisingly, few days ago I discovered this
collection of tiling ideas:

http://paulbourke.net/geometry/tilingplane/

Almost absolutely sure that you are familiar with it ....
--
YB


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From: Bald Eagle
Subject: Re: Optimal planar tiling
Date: 11 Feb 2023 19:10:00
Message: <web.63e82d8db0df30fc1f9dae3025979125@news.povray.org>
"Bald Eagle" <cre### [at] netscapenet> wrote:

> during my search for more information on the Choe hexagonal tiling, I found the
> attached image, which I

.... never attached.


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Attachments:
Download '5445.jpg' (64 KB)

Preview of image '5445.jpg'
5445.jpg


 

From: Bald Eagle
Subject: Re: Optimal planar tiling
Date: 11 Feb 2023 19:20:00
Message: <web.63e83081b0df30fc1f9dae3025979125@news.povray.org>
"Bald Eagle" <cre### [at] netscapenet> wrote:
> jr recently spammed me with a very interesting article, see:

> Next task is going to figure out how to make this into a pigment {function{}}
> pattern, and color it like the inbuilt hexagon pattern.

Although I have a decent scene that uses Martijn Steinrucker's hexagon pattern,
I tried to implement the hexagon patterns from POV-Ray's source code.

I got Jerome Grimbert's hexagonal tiling version to _almost_ work, and failed
miserably with the "simple" hexagon pattern - probably due to the complex
coloring code which uses some nested #switch blocks.  Challenging stuff to
convert to functions.

Anyway, here's the simple scene code making a prism.

Maybe if anyone has experience making some of these pattern types, they could
post some tutorial material to explain the reasoning behind some of the
functions.


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Attachments:
Download 'choehexagon.pov.txt' (4 KB)

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