Search found 115 matches

by Ulrich
Mon Dec 10, 2018 10:29 am
Forum: Polyhedron Models
Topic: Work in progress
Replies: 12
Views: 2577

Re: Work in progress

The diameter will be 396 mm. You‘re right, the pattern is based on the stellation diagram. A laser cutting machine works well and can accelerate the process a lot. I could gather some experience in the past. The results are very precise but a little „sterile“. And although it can be rather painful, ...
by Ulrich
Thu Nov 29, 2018 10:22 am
Forum: Polyhedra
Topic: New Torus
Replies: 9
Views: 2529

Re: New Torus

You should have a look at Alex Doskey‘s website. He studied Stewart’s book thoroughly and he has lots of such toroids:

polyhedra.doskey.com/stewart00.html

Ulrich
by Ulrich
Thu Nov 29, 2018 10:03 am
Forum: Polyhedron Models
Topic: Work in progress
Replies: 12
Views: 2577

Re: Work in progress

Thanks! I‘ll keep you current

Ulrich
by Ulrich
Wed Nov 28, 2018 7:52 am
Forum: Polyhedron Models
Topic: Work in progress
Replies: 12
Views: 2577

Work in progress

This is the sixth stellation of my model of the great snub dodecicosidodecahedron, which is No. 115 in Magnus Wenninger‘s book „polyhedron models“. Nine further stellations are to come. The edge length will be 30 cm. There are 15 colours, 6 for the snub triangles, 5 for the icosahedral triangles and...
by Ulrich
Fri Sep 28, 2018 7:03 am
Forum: Polyhedra
Topic: Nadia's Icosahedron
Replies: 13
Views: 3127

Re: Nadia's Icosahedron

Ah, thanks! I tried ~6 but that could not work, as I know now.

Ulrich
by Ulrich
Tue Sep 25, 2018 8:51 am
Forum: Polyhedra
Topic: Nadia's Icosahedron
Replies: 13
Views: 3127

Re: Nadia's Icosahedron

Thank you very much, I got it. And I found out how to construct the desired shape with stella: The half of the top angle of the pyramid on the top/Bottom face is 45° and the height is the same as the bottom edge. So I have to construct a frustum of that pyramid so that the top edges are the same as ...
by Ulrich
Mon Sep 24, 2018 6:41 pm
Forum: Polyhedra
Topic: Nadia's Icosahedron
Replies: 13
Views: 3127

Re: Nadia's Icosahedron

I‘m on my way, got the lateral hexagons regular. I made a model of these hexagons and triangles only which can be trimmed with the „try to make faces regular“ tool.Then I took the convex null and expanded the remaining triangles to kites. Now what is the trick to cut down the top and bottom vertices...
by Ulrich
Mon Sep 24, 2018 4:34 pm
Forum: Polyhedra
Topic: Nadia's Icosahedron
Replies: 13
Views: 3127

Re: Nadia's Icosahedron

Robert, Beautiful work! I tried to get it on my own but i could not make the hexagons regular. The best result gave the „create spring model“ tool. In the lateral hexagons there is a difference in the long diagonals of about 2% and the top/bottom hexagons are regular but have a different edge length...
by Ulrich
Tue Jun 12, 2018 1:33 pm
Forum: Stella Forum
Topic: Flattening a face
Replies: 4
Views: 1514

Re: Flattening a face

If you want to augment a (modified) stellated dodecahedron with a tetrahedron, I think this is only possible with the great stellated dodecahedron where you cut off a piece of one spike. Then you have a new face formed like an equilateral triangle and you can augment it with a tetrahedron. http://i2...
by Ulrich
Sun Apr 29, 2018 9:26 am
Forum: Stella Forum
Topic: snub rhombicuboctahedron
Replies: 8
Views: 2928

Ah, that‘s good to know!

u.
by Ulrich
Fri Apr 27, 2018 12:37 pm
Forum: Stella Forum
Topic: snub rhombicuboctahedron
Replies: 8
Views: 2928

There is another way to create those models easily: You take the cuboctahedron and hit the "Morph duals by Expansion"-button All edges are replaced by quadrilaterals. You put the result into a Memory, retrieve it and activate the base model view again. Then you facet the squares, triangles and rhomb...
by Ulrich
Tue Apr 24, 2018 8:04 am
Forum: Stella Forum
Topic: snub rhombicuboctahedron
Replies: 8
Views: 2928

Very nice! You can get it also by simply subdividing the faces of the rhombicuboctahedron. Then facet and make the faces as regular as can be. In the same way you can make a snub rhombicosidodecahedron: http://i254.photobucket.com/albums/hh82/Heinzzweidrei/snub%20rhombicosidodecahedron_zps7b5svfj1.j...
by Ulrich
Fri Jul 28, 2017 10:29 am
Forum: Stella Forum
Topic: Tutorial: how to make this thing
Replies: 3
Views: 5551

works fine, thanks!


Image
by Ulrich
Fri Jul 28, 2017 6:36 am
Forum: Stella Forum
Topic: Tutorial: how to make this thing
Replies: 3
Views: 5551

Robert,

how do you get the six spheres blue in the original Picture?

Ulrich
by Ulrich
Sun Jun 25, 2017 9:38 am
Forum: Stella Forum
Topic: Faceting
Replies: 6
Views: 6473

You cannot upload pictures in this forum directly, you have to put a link to a file you uploaded to your website or to photobucket or something like that. Before creating a new model from facetings make sure that you chose a layout with at least 2 windows (hit ctrl+2). Then you have the base model i...