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icon7.gif  Not a Knot [message #48009] Mon, 07 May 2012 18:32 UTC Go to next message
avatar Metamagic is currently offline Metamagic
Messages: 6
Registered: April 2012
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My first model arrived today. Yay!

It's a symmetric network on top of a rhombic triacontahedron. Six separate pieces tightly interwoven.

I wanted to experience the quality of the 3D print before proceededing with my other models. It turned out much better than I anticipated.

First I wanted to do it in metal but it wasn't possible since the model is in separate pieces. I may create a new model where they connect with a thin wire which I can then cut afterwards.

Definitely not my last 3D print Smile

Thomas

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Re: Not a Knot [message #48191 is a reply to message #48009 ] Thu, 10 May 2012 12:25 UTC Go to previous messageGo to next message
avatar Metamagic is currently offline Metamagic
Messages: 6
Registered: April 2012
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Hi,

It did wake my curiousity, too, and inspire me first time I saw an object like that. I'll be happy to share some information about it.

Take a look at Carlo Sequin's paper on tangled knots:
http://www.cs.berkeley.edu/~sequin/PAPERS/ArtMath05_TangledK nots.pdf

He has created a number of similar objects. An image search on his name will reveal many other interesting structures.

Thomas
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Re: Not a Knot [message #48195 is a reply to message #48191 ] Thu, 10 May 2012 13:03 UTC Go to previous messageGo to next message
avatar Metamagic is currently offline Metamagic
Messages: 6
Registered: April 2012
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At the moment, it's only use is for decoration. Maybe a keychain or jewelry made in metal.

Are you Danish, too? Your signature says "fjernstyret bil" Smile

Thomas
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Re: Not a Knot [message #48307 is a reply to message #48195 ] Sat, 12 May 2012 15:17 UTC Go to previous messageGo to next message
avatar Metamagic is currently offline Metamagic
Messages: 6
Registered: April 2012
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Junior Member
I'm not sure what you mean by "decorated for what", but it was made to be put on my desk. It's nice to roll around in the hand as well Smile

The design was created on my PC using a program that I wrote.

Thomas
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Re: Not a Knot [message #48426 is a reply to message #48307 ] Tue, 15 May 2012 09:49 UTC Go to previous message
avatar Metamagic is currently offline Metamagic
Messages: 6
Registered: April 2012
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Junior Member
The program that I made is not publicly available yet. You would need to create one yourself. Technically, "Not a Knot" is a network of splines on top of a polyhedron, but it's difficult to explain all the details here.

Some of my newer figures involves physically-based modeling, too (like these: http://www.shapeways.com/model/571165/pendant.html and http://www.shapeways.com/model/571178/sausage-ball.html). Maybe one day, I'll make the tool public.

If you want to have the object itself, of course just go to
http://www.shapeways.com/model/549781/not-a-knot.html
and click 'Add to Cart' Smile

Thomas
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