Search found 55 matches

by marcelteun
Sun Aug 30, 2020 6:33 pm
Forum: Polyhedron Models
Topic: What's the most complex model you've ever made?
Replies: 32
Views: 107470

Re: What's the most complex model you've ever made?

Thanks, Ulrich! You made a interesting observation! It is true that many models with folded regular heptagons that I made have that property: they consist of heptagons where two sides of one heptagon are glued together. I am not sure why that works well, but it might be related to the fact that you ...
by marcelteun
Mon Aug 17, 2020 9:15 am
Forum: Polyhedron Models
Topic: What's the most complex model you've ever made?
Replies: 32
Views: 107470

Re: What's the most complex model you've ever made?

I see that I promised to update this discussion with a model I built. It is this one: https://i.postimg.cc/n9CWcJVd/nemesis-o5.jpg It doesn't consist of many faces, but it was hard to build. I failed once, many years ago. Then after some years I decided I should try again and then I thought more abo...
by marcelteun
Mon Aug 17, 2020 8:49 am
Forum: Polyhedra
Topic: Noble polyhedra. Where can I find them?
Replies: 17
Views: 3219

Re: Noble polyhedra. Where can I find them?

My paper about exploring noble polyhedra with Stella4D is now online at the Bridges Website: http://archive.bridgesmathart.org/2020/bridges2020-257.pdf Ulrich Pity the Corona caused the event to be cancelled. After years of skipping the event, I was planning to come this year. Congrats with your ar...
by marcelteun
Mon Aug 17, 2020 8:46 am
Forum: Polyhedron Models
Topic: A few pics
Replies: 28
Views: 9994

Re: A few pics

Beautiful work! I like compounds in general (currently I am building the rigid compound of 15 cubes). I really like the compound of the Small Stellated Dodecahedron and the 5 Tetrahedra. :D
by marcelteun
Wed Jan 08, 2020 12:16 pm
Forum: Polyhedron Models
Topic: A few pics
Replies: 28
Views: 9994

Re: A few pics

There are people here who built all of them,.. (Not me, and I have no interest in that either)
by marcelteun
Thu Dec 19, 2019 12:34 pm
Forum: Polyhedra
Topic: Heptagons
Replies: 6
Views: 2235

Re: Heptagons

marcelteun wrote:
Wed Nov 27, 2019 7:28 am
Obviously some more variances exist and I am planning to construct a few more of them.
Here is another one that I built recently:
Image
by marcelteun
Wed Nov 27, 2019 7:28 am
Forum: Polyhedra
Topic: Heptagons
Replies: 6
Views: 2235

Re: Heptagons

For my next project I am thinking to build a compound of 15 cubes. http://tunnissen.eu/polyh/local_off.html?off_file=http://tunnissen.eu/polyh/CubeCompounds.off/15.A5xI.D2xI.off Don't want to make it big though, so it will be a challenge. I did start with that one; I constructed 1/12th, and it seem...
by marcelteun
Wed Nov 13, 2019 10:11 am
Forum: Polyhedron Models
Topic: A few pics
Replies: 28
Views: 9994

Re: A few pics

robertw wrote:
Sun Nov 10, 2019 10:56 am
I don't know where you saw the "mu" variable.
That he must have picked up from me. For the compounds with rotational freedom I use the angle mu. I think I use the same Greek letter as in "Symmetry Orbits". For one of the compounds I used 6 | S4xI / C4xI | mu.

Marcelteun
by marcelteun
Fri Nov 08, 2019 11:55 am
Forum: Polyhedron Models
Topic: A few pics
Replies: 28
Views: 9994

Re: A few pics

Hi Robin,

I am sure you can combine these with Stella by just adding the compounds as described below, but I let Robert answer that, since I am not familiar with Stella.

I uploaded a zip file (temporarily) on my own site with the two models shown:
https://tunnissen.eu/tmp/14_cubes.zip
by marcelteun
Thu Nov 07, 2019 4:54 pm
Forum: Polyhedron Models
Topic: A few pics
Replies: 28
Views: 9994

Re: A few pics

Here I used the 6 | S4xI /D2xI version, there is also a version 6 | S4xI / C4xI where you have a rotational freedom. In that case I would use an angle that will evenly divide when adding the extra cube, i.e.mu=30 degrees.... Hmm, actually because to the classical compound of 3 cubes, one more is ad...
by marcelteun
Thu Nov 07, 2019 4:32 pm
Forum: Polyhedron Models
Topic: A few pics
Replies: 28
Views: 9994

Re: A few pics

You can also put together 1, 3, 4, and 6 to get 14 cubes. This looks as follows: https://i.postimg.cc/LqqnSKGy/14-cubes.png In that case you will not be able to the the 15th of course Here I used the 6 | S4xI /D2xI version, there is also a version 6 | S4xI / C4xI where you have a rotational freedom....
by marcelteun
Thu Nov 07, 2019 12:50 pm
Forum: Polyhedron Models
Topic: Built Models of Compound Polyhedra
Replies: 6
Views: 2578

Re: Built Models of Compound Polyhedra

I used the nomenclature from Verheyen's book "Symmetry Orbits"
by marcelteun
Wed Oct 16, 2019 8:29 am
Forum: Polyhedron Models
Topic: Built Models of Compound Polyhedra
Replies: 6
Views: 2578

Re: Built Models of Compound Polyhedra

Here is a picture of both version (A and B) together
Image

I call them "Mr and Mrs"
by marcelteun
Mon Oct 14, 2019 6:14 am
Forum: Polyhedron Models
Topic: Built Models of Compound Polyhedra
Replies: 6
Views: 2578

Re: Built Models of Compound Polyhedra

Thanks Robert.
by marcelteun
Fri Oct 11, 2019 2:35 pm
Forum: Polyhedron Models
Topic: Built Models of Compound Polyhedra
Replies: 6
Views: 2578

Built Models of Compound Polyhedra

I thought we could gather models for compound polyhedra. I don't know why, but I like compound polyhedra and I built quite a few (well, relatively) of them. This is the latest one I built: https://i.postimg.cc/Q9JfVWKR/10-A-A5x-I-D3x-I.jpg It is referred to as 10A | A5xI / D3xI. I guess a 3D is quic...