Search found 51 matches

by marcelteun
Wed Jan 08, 2020 12:16 pm
Forum: Polyhedron Models
Topic: A few pics
Replies: 25
Views: 3480

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: 5
Views: 646

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: 5
Views: 646

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: 25
Views: 3480

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: 25
Views: 3480

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: 25
Views: 3480

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: 25
Views: 3480

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: 777

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: 777

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: 777

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: 777

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...
by marcelteun
Tue Oct 08, 2019 8:53 am
Forum: Polyhedra
Topic: Compounds of Cubes & Tetrahedra
Replies: 8
Views: 26155

Re: Compounds of Cubes & Tetrahedra

The following pages contain some more info about these compounds: http://www.tunnissen.eu/polyh/tetrahedra-compounds.vrml.html http://www.tunnissen.eu/polyh/cubecmps.vrml.html http://www.tunnissen.eu/polyh/octacmps.vrml.html Since VRML is hopelessly outdated, I also have pages that use Javascript t...
by marcelteun
Mon Oct 07, 2019 6:26 am
Forum: Polyhedra
Topic: Heptagons
Replies: 5
Views: 646

Re: Heptagons

I finished the model. This time I succeeded. It's a relief that I succeeded this time. Apparently this was not my Nemesis. :wink: Here is a picture into an order 5 symmetry axis: https://i.postimg.cc/McBSXNZ7/A5-hepta-twister.jpg For my next project I am thinking to build a compound of 15 cubes. htt...
by marcelteun
Wed Oct 02, 2019 5:42 am
Forum: Polyhedra
Topic: Constructing models with transparent faces?
Replies: 8
Views: 2162

Re: Constructing models with transparent faces?

Yesterday evening I suddenly remembered that I made another model with transparent faces. One that isn't a polychoron. This one: http://tunnissen.eu/polyh/heptagons/pics/hepta.GD.A5xI.jpg It consists of equilateral heptagons that look like regular heptagons. I made this one transparent, because othe...
by marcelteun
Tue Oct 01, 2019 1:55 pm
Forum: Polyhedra
Topic: Heptagons
Replies: 5
Views: 646

Re: Heptagons

Hi Ulrich Here is a zip-file with 24 examples of polyhedra that only consist of regular heptagons. I found more of these, but some are quite messy and I didn't include them here. I just noticed that one off-file of a model that I built is missing. I also found polyhedra that have other regular polyg...