Search found 23 matches

by marcelteun
Mon Jul 19, 2010 8:18 pm
Forum: Polyhedra
Topic: Isohedra with non-convex faces
Replies: 19
Views: 39002

Haven't been around for a while and look so many posts. And I thought that I would receive mail. I guess I have to check my settings. Anyway. Just wanted to say 1 thing here. I share your love for chiral models! Besides the fact that they are usually more challenging to build, I think they are intri...
by marcelteun
Wed Feb 10, 2010 8:28 am
Forum: Polyhedra
Topic: Compounds of Cubes & Tetrahedra
Replies: 7
Views: 22819

Last monday I was sick: I was lying in bed staring at my models of compounds of cubes and my mind wandered off. I thought that there should be a compound of containing 5 times a compound of six cubes (6 | S4 x I / D2 x I). Yesterday evening (I felt much better then) I tried it and found myself looki...
by marcelteun
Sat Feb 06, 2010 11:37 am
Forum: Polyhedra
Topic: Tintin-R
Replies: 1
Views: 8457

Tintin-R

Hi,

My 4 year old son asked me to create a rocket polyhedron. I though I would share it with you.

:wink:

Image
by marcelteun
Sat Jan 30, 2010 2:29 pm
Forum: Polyhedra
Topic: Do you ever make polyhedra for other people?
Replies: 7
Views: 20240

:D I don't think I will build this one again, except perhaps to keep a version for myself anyway... :wink: In this thread: http://software3d.com/Forums/viewtopic.php?p=242#242 There is a link to a zip file containing all compounds. This one should be included as 30A.A5xI.C2xI.mu7.off For a compound ...
by marcelteun
Thu Jan 21, 2010 11:29 pm
Forum: Polyhedra
Topic: Do you ever make polyhedra for other people?
Replies: 7
Views: 20240

Actually I give quite many nowadays. It is difficult sometimes, but what if I have everything at home and a fire breaks out?...
On the other hand I do miss some of them as well. Here is one example: http://tunnissen.eu/polyh/Cubes30.html
by marcelteun
Fri Feb 29, 2008 10:58 am
Forum: Polyhedron Models
Topic: Paper model choices. Scissors/knife? Single/double tabs? etc
Replies: 24
Views: 159903

What does everyone else use for hole poking? I go through needles pretty fast, and I'm pretty sick of hot gluing them to sticks... I actually bought a special tool a long time ago. I guess it was more than 10 years ago, since it was before I moved to Sweden. I bought it in a hobby shop: http://i248...
by marcelteun
Fri Feb 29, 2008 10:18 am
Forum: Polyhedron Models
Topic: Paper model choices. Scissors/knife? Single/double tabs? etc
Replies: 24
Views: 159903

A few days ago I got the following question: I'm curious about materials and methods others use. I came across your website so I saw pictures of yours. One thing you must know after making models is that you have to take into consideration the thickness of the material you're using (where 2 edges me...
by marcelteun
Fri Feb 29, 2008 9:55 am
Forum: Polyhedra
Topic: Compounds of cubes
Replies: 8
Views: 23193

marcelteun wrote: BTW Thanks for mentioning this, I found a typo on my webpage at http://www.tunnissen.eu/polyh/cubecmps. ... .S4xI.C2xI
Just want to mention that I fixed this
by marcelteun
Mon Feb 25, 2008 9:19 am
Forum: Polyhedra
Topic: Compounds of cubes
Replies: 8
Views: 23193

Yes, it seems that the same holds for 30A | A5xI / C2xI | mu9 and 30B | A5xI / C2xI | mu3 (the names link to VRML models for which a special player is required): http://i248.photobucket.com/albums/gg194/stellatum/A5xI_C2xI_30Amu9.png http://i248.photobucket.com/albums/gg194/stellatum/A5xI_C2xI_30Bmu...
by marcelteun
Mon Feb 25, 2008 3:08 am
Forum: Polyhedra
Topic: Compounds of cubes
Replies: 8
Views: 23193

Well, if by this you mean that one compound is obtained from the other by simultaneously rotating the four groups of three cubes about their common axes of symmetry through an angle pi/12, then you've got it Exclamation Aha!... Of course, that is completely logical and there are probably more such ...
by marcelteun
Sun Feb 24, 2008 11:48 am
Forum: Polyhedra
Topic: Compounds of Cubes & Tetrahedra
Replies: 7
Views: 22819

C6_E_6.eg.off ... Mean anything to you? Sure, it was me who named all of them (but it was a while ago that I worked with this set and apparently I didn't have the last version on my site before) The names are derived from Verheyen's notation, with the difference that I move the amount to the end of...
by marcelteun
Sat Feb 23, 2008 6:35 am
Forum: Polyhedra
Topic: Compounds of Cubes & Tetrahedra
Replies: 7
Views: 22819

Thanks for your feed back Rob! I put a new file with compounds of tetrahedra there with new versions of A5xI_C3_40.eg.off. and S4xI_D2C2_12.off. After I regenerated the zip file I noticed it contained 8 files more than before. I didn't check which files were extra. Btw the archive does not contain a...
by marcelteun
Thu Feb 21, 2008 8:38 am
Forum: Polyhedra
Topic: Compounds of cubes
Replies: 8
Views: 23193

The first model you show is a special position of 12A | S4 x I / C2 x I | μ , for which μ = acos(1/√3) such that it can be divided into 3 x 4 | D12 x I / D3 x I or into 4 x 3 | D12 x I / D4 x I while the other one is a special version of 12B | S4 x I / C2 x I | μ , with μ =...
by marcelteun
Wed Feb 20, 2008 11:57 am
Forum: Polyhedra
Topic: Compounds of cubes
Replies: 8
Views: 23193

that someone actually went to the trouble of calculating (apparently without the benefit of a computer) and building paper models of all the figures That is indeed amazing. The PC brought us many good things, but a part of the old fun is gone as well. As a student I found my first compound of twelv...
by marcelteun
Tue Feb 19, 2008 1:46 pm
Forum: Polyhedron Models
Topic: Paper model choices. Scissors/knife? Single/double tabs? etc
Replies: 24
Views: 159903

I considered squeezing layers together a long time ago, but I was a bit afraid that this would be too inaccurate, in case you don't keep your needle or knife straight. Do you experience problem with imprecision? How many layers (more or less) do you put together? Do you use a special stapler for hea...