Search found 721 matches

by robertw
Wed Oct 21, 2009 12:47 pm
Forum: Stella Forum
Topic: question about alternation
Replies: 3
Views: 22003

I'm not sure what you mean by "alternate". What is it you want to do exactly? Can you give an example?

Stella5D - unlikely. There's still plenty for me to do in 3D and 4D!

Rob.
by robertw
Wed Sep 23, 2009 11:28 am
Forum: Stella Forum
Topic: pentachoron and icositetrachoron
Replies: 2
Views: 19963

Hmm, not sure. If you had the cross-section view selected, or the cell view, then you'd be looking at a 3D model, but not quite the ones you describe.

In 4D views cells are reduced in size by default so that you can see the internal structure better, but if you scaled them up to full size it would ...
by robertw
Wed Sep 23, 2009 10:59 am
Forum: Polyhedra
Topic: Isohedra with non-convex faces
Replies: 19
Views: 165617

I'm not going to attempt the maths, but some of those look similar to stellations of the pentagonal icositetrahedron. See here:

http://www.software3d.com/Stellations.php

These are all easily made in Stella.
Rob.
by robertw
Mon Sep 14, 2009 2:51 pm
Forum: Stella Forum
Topic: missing toolbar ?
Replies: 2
Views: 17380

By toggle the check box you mean on the menu? "View->Toolbars->Show View-Type Toolbar"?

If that's ticked, then maybe somehow it got moved off-screen. I haven't heard of that before. Try turning it on and off (via the menu) and watch carefully for anything appearing disappearing anywhere, possibly ...
by robertw
Thu Aug 27, 2009 2:09 pm
Forum: Polyhedra
Topic: Compound of Two Deltahedra
Replies: 10
Views: 101655

The non-convex Archimedean polyhedron sharing the edges, vertices and triangular faces of the cuboctahedron - but having the diametral hexagons in place of the square faces.

I suspect that all the vertices in the compound of five such, dodecahedral symmetry, can be folded without cutting - with ...
by robertw
Sat Aug 22, 2009 3:53 pm
Forum: Polyhedra
Topic: Compound of Two Deltahedra
Replies: 10
Views: 101655

Yes, that compound you mention is interesting. It has two different types of starry vertices, and both can be folded from flat paper without a cut to the vertex. I keep meaning to make one. Here's the .stel file if any Stella users want to have a look:

http://www.software3d.com/StelFiles/GreatDod ...
by robertw
Tue Aug 18, 2009 2:09 pm
Forum: Stella Forum
Topic: export pdf and keyboard shortcuts view orientation
Replies: 1
Views: 16260

Stella can't export to PDF, although you might be able to find a virtual printer which lets you print to a PDF file instead of a printer. Better though to just export images using "File->Export Image" and work with the other image formats. When exporting you may choose high resolutions, as well as ...
by robertw
Tue Aug 18, 2009 1:38 pm
Forum: Stella Forum
Topic: Models, Exports and moving into STL format?
Replies: 5
Views: 37587

Hi,

I wish I had a 3D printer! You can probably find a way to convert from .OBJ format to .STL, but I'm afraid I don't know how off-hand.

One tip: always export your model from the stellation view. In this view, only the externally visible parts of faces are exported, ie only the outer shell. Your ...
by robertw
Tue Aug 18, 2009 1:15 pm
Forum: Polyhedra
Topic: Compound of Two Deltahedra
Replies: 10
Views: 101655

Your thoughts are right. Interestingly, although some faces occur in coplanar sets of six, none of them overlap, although they seem to share a vertex.

Image

Only 144 facelets, so shouldn't be too hard to make one.

Rob.
by robertw
Mon Jul 13, 2009 10:59 am
Forum: Stella Forum
Topic: Coordinates of vertices
Replies: 1
Views: 18992

"File->3D Export->Export OFF"

This will export face data too, but the list of vertex coords at the start of the file should be easy to decipher.

Rob.
by robertw
Wed Jul 08, 2009 11:45 am
Forum: Stella Forum
Topic: Facet vertex angles and sizes
Replies: 15
Views: 160173

Yes, you can't upload photos here directly and need a link. I suggest setting up an account at http://photobucket.com/

Rob.
by robertw
Wed Jul 01, 2009 12:44 pm
Forum: Stella Forum
Topic: Facet vertex angles and sizes
Replies: 15
Views: 160173

Sounds like you don't want thick bevelled faces, but thick unbevelled faces would suffice (ie shallow prisms). This is probably even easier that Ulrich's idea.

Start with your model, put it in a memory slot (eg hit "m1"). Select the face you're interested in and hit "a" to augment it. Select "prism ...
by robertw
Sun Jun 28, 2009 2:36 am
Forum: Stella Forum
Topic: Facet vertex angles and sizes
Replies: 15
Views: 160173

Sorry, no you can't export a single face as a 2D dxf. Stella only exports full models as 3D dxf.

If you export the whole model though, doesn't that have the faces you need within it?

Rob.
by robertw
Sat Jun 27, 2009 5:50 am
Forum: Stella Forum
Topic: Facet vertex angles and sizes
Replies: 15
Views: 160173

I'm not sure what math your after. Different shapes are made different ways. Many categories, like uniform polyhedra, stellations, etc took me a long time to get working, and were not really just implemented based on any standard formulas or algorithms.

It sounds like you want to create these ...
by robertw
Tue Jun 23, 2009 2:08 pm
Forum: MineSweeper3D Forum
Topic: Help, please!
Replies: 4
Views: 80835

The obvious question: did you change anything in your system in the last week or so? Doesn't XP tell you when it's doing an update?

Rob.