Search found 48 matches

by marcelteun
Wed Nov 13, 2019 10:11 am
Forum: Polyhedron Models
Topic: A few pics
Replies: 20
Views: 1927

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: 20
Views: 1927

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: 20
Views: 1927

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: 20
Views: 1927

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: 327

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: 327

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: 327

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: 327

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: 25634

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: 3
Views: 188

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: 1643

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: 3
Views: 188

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...
by marcelteun
Mon Sep 30, 2019 10:14 am
Forum: Polyhedra
Topic: Heptagons
Replies: 3
Views: 188

Heptagons

Some of you might know that I am interested in heptagons. The background for this interest is that if you ignore polyhedra with prism and anti-prism symmetry then the heptagon forms the first gap of polygons for which there aren't any uniform polyhedra. Even if you look at the Johnson solids, where ...
by marcelteun
Thu Sep 26, 2019 6:58 am
Forum: Polyhedra
Topic: Constructing models with transparent faces?
Replies: 8
Views: 1643

Re: Constructing models with transparent faces?

What glue did you use? I found that it just peeled off later. Nothing fancy, really. In the picture below I show the glues I used. The Karlsons (yellow) is the one I used. Nowadays I use the other one (Casco, black). Cannot explain why, I just think it is a better glue. It did happens sometimes tha...