Search found 559 matches

by robertw
Tue Feb 26, 2008 2:01 pm
Forum: Polyhedra
Topic: Books about Polyhedra
Replies: 10
Views: 41550

Re: Cundy & Rollett

This sounds like it might be Cundy & Rollett's Mathematical Models , which describes the construction of the five cubes compound in just that way. (On the other hand, that book was not necessarily for young readers.) No, it was not that book. It contained larger nets that you could trace off and us...
by robertw
Tue Feb 26, 2008 1:50 pm
Forum: Polyhedra
Topic: Books about Polyhedra
Replies: 10
Views: 41550

Re: Cundy & Rollett

If you use double tabs and continue the tabs where the edges form pentagrams - do it pin-wheel style with 5 sets of double tabs, each holding two pairs of triangles (and thereby bracing each octavalent re-entrant vertex) - the model is so rigid you would not believe it! I'd believe it (although I g...
by robertw
Mon Feb 25, 2008 2:02 pm
Forum: Stella Forum
Topic: Compounds of 10 regular polychora
Replies: 12
Views: 43730

Re: Ten grand stellated hecatonicosachora

Compare, say, a great stellated dodecahedron with a single one of its two-dimensional cross sections, which might typically be a few interpenetrating polygons. And just for fun, here's a cross-section of the great stellated dodecahedron , taken at the 0.555 depth that George has grown fond of: http...
by robertw
Mon Feb 25, 2008 12:38 pm
Forum: Polyhedra
Topic: Compounds of cubes
Replies: 8
Views: 30137

by robertw
Mon Feb 25, 2008 12:35 pm
Forum: Polyhedra
Topic: Books about Polyhedra
Replies: 10
Views: 41550

I have split this topic up, as it went off-topic. The posts that have moved are now in a new thread for discussion of cube compounds here: http://software3d.com/Forums/viewtopic.php?t=45 . You'll have to subscribe to that thread again if you wish to be notified of new posts. Book-wise, I think I rem...
by robertw
Sun Feb 24, 2008 4:06 am
Forum: Polyhedra
Topic: Compounds of Cubes & Tetrahedra
Replies: 8
Views: 30066

I noticed it contained 8 files more than before. I didn't check which files were extra. Don't know what it means, but here are the extra files: C6_E_6.eg.off D12xI_C3_16.eg.off D18D9_D3C3_6.off D1xI_C2C1_2.eg.off D2D1_D1C1_2.eg.off D6_E_12.eg.off D6C6_E_12.eg.off D9xI_C3_12.eg.off Mean anything to ...
by robertw
Thu Feb 21, 2008 12:49 pm
Forum: Stella Forum
Topic: More 4D compounds now available
Replies: 51
Views: 110535

Re: Five grand hexacosichora

Should I post a similar series on the compounds of ten :?: :wink: George has indeed continued his series for the compounds of ten regular polychora, but I have split this into a new topic. You can find that new topic here: http://www.software3d.com/Forums/viewtopic.php?t=44 If you were watching thi...
by robertw
Wed Feb 20, 2008 3:31 am
Forum: Polyhedron Models
Topic: Paper model choices. Scissors/knife? Single/double tabs? etc
Replies: 24
Views: 177593

I most models I don't use tabs - I glue edge to edge. I'm amazed this works. It always seems like such models would fall apart far more easily, and that excess glue would be a problem on the outside of the model. But you've made models far more complex than mine, so I guess it must work! Can you te...
by robertw
Tue Feb 19, 2008 3:37 am
Forum: Stella Forum
Topic: Face types and Vertex types
Replies: 4
Views: 15224

Oops, I meant the dual of the truncated cuboctahedron. It's faces come in two types which are reflections of each other. Standard auto-colouring means that Stella will colour by face-type, unless the model is a compound, then it is coloured as a compound instead. Use "Color->Basic Color Scheme->Colo...
by robertw
Mon Feb 18, 2008 12:51 pm
Forum: Stella Forum
Topic: Face types and Vertex types
Replies: 4
Views: 15224

Re: Face types and Vertex types

By "face type" I refer not just to face shape, but also to how the face fits into the symmetry of the overall model. For example, the snub cube contains two different triangular face types. Both are equilateral, but one connects to three other triangles at its edges, and the other connects to two tr...
by robertw
Sun Feb 17, 2008 2:37 am
Forum: Polyhedron Models
Topic: Net Needed
Replies: 1
Views: 9394

Perhaps it is just you :)

You'll find it as "Stella Library->Geodesic Hemispheres->4-Frequency Icosahedral Geodesic Hemisphere" (either using the model drop-downs, or the tree in Ctrl+N).

Rob.
by robertw
Thu Feb 14, 2008 4:01 pm
Forum: Polyhedra
Topic: Compounds of Cubes & Tetrahedra
Replies: 8
Views: 30066

Thanks Marcel! I tried them, and the OFF files seem to open easily in Stella. along with their nets. All 357 could all be loaded, but Stella failed to create nets for 5 of them, claiming possible accuracy errors, but who knows. I'll have a look sometime and see if I can shed any light on it. The eas...
by robertw
Thu Feb 14, 2008 4:01 pm
Forum: MineSweeper3D Forum
Topic: mine sweep TRUE 3D
Replies: 17
Views: 60412

robertw wrote:Does it tell you when you win?
Ah, it does now. Just had another look. I find it hard to navigate, but otherwise it seems to work OK. Are you planning to do much more to it?

Rob.
by robertw
Thu Feb 14, 2008 7:03 am
Forum: Polyhedron Models
Topic: Paper model choices. Scissors/knife? Single/double tabs? etc
Replies: 24
Views: 177593

Re: How to Build a Polyhedron Model

Hey Magnus, great to have you onboard :D How should the last piece be put in. This is also very tricky. For W34 I leave tabs all around the bottom of the five-facet nets, all of one color or of five different colors. The long spikes are all closed, and these are not too difficult to glue together by...
by robertw
Wed Feb 13, 2008 2:54 am
Forum: Polyhedron Models
Topic: What's the most complex model you've ever made?
Replies: 32
Views: 113390

marcelteun wrote:For me the model with the most amount of faces would be a fractal kinda octahedron. It counts 1728 faces and funnily enough it belongs to the smallest models I built.
Looks like the edges would all be about 0.5 cms long, is that right? Sounds pretty fidgety to me!

Rob.