Search found 460 matches

by robertw
Sun Jan 20, 2019 5:40 am
Forum: Stella Forum
Topic: Non-Uniform 4D
Replies: 8
Views: 120

Re: Non-Uniform 4D

Oh, and if the model you're importing is convex, then you can get away with ONLY vertices, and Stella will create the convex hull of those vertices for you.
by robertw
Sun Jan 20, 2019 5:40 am
Forum: Stella Forum
Topic: Non-Uniform 4D
Replies: 8
Views: 120

Re: Non-Uniform 4D

Oops, yep I got confused too, taking your lead :) It's the cells you don't need. You need the faces.

How to arrange faces into cells can be ambiguous, but you can leave cells out and let Stella guess.
by robertw
Sat Jan 19, 2019 11:57 am
Forum: Stella Feature Requests
Topic: spherical models
Replies: 2
Views: 34

Re: spherical models

You can create geodesic domes using "Poly->Create Geodesic Spheres", and find a bunch of pre-created ones in the Stella Library under the "Geodesic Hemispheres" and "Geodesic Spheres" categories.

But to construct them in the manner of Wenninger is different from how Stella usually presents models.
by robertw
Sat Jan 19, 2019 10:14 am
Forum: Stella Forum
Topic: Non-Uniform 4D
Replies: 8
Views: 120

Re: Non-Uniform 4D

Just leave out the faces. Give the number of faces as zero and just list the vertices and cells.

Stella will guess the faces for you. For some polytopes this is ambiguous, which is why it allows you to specify, but usually it's not ambiguous so you can leave it out.
by robertw
Tue Jan 15, 2019 1:18 am
Forum: Polyhedron Models
Topic: Work in progress
Replies: 8
Views: 482

Re: Work in progress

Well done, looks great!
by robertw
Tue Jan 08, 2019 2:41 am
Forum: Stella Forum
Topic: Coxeter Plane projections
Replies: 8
Views: 127

Re: Coxeter Plane projections

Ah that makes sense. Looking at the cell just changes the 3D rotation, so if you change the way it projects from 4D to 3D, then this won't be altered. So yes, leave it at the default projection.
by robertw
Mon Jan 07, 2019 2:27 am
Forum: General
Topic: Music!
Replies: 0
Views: 45

Music!

Aside from writing Stella, MineSweeper3D etc, I've also been writing music! This has nothing to do with geometry, but thought someone might be interested to see (or hear) what else I do. I'm told these have a "serial killer vibe", but not sure if that's a compliment! Have a listen on SoundCloud: htt...
by robertw
Mon Jan 07, 2019 1:48 am
Forum: Stella Forum
Topic: Coxeter Plane projections
Replies: 8
Views: 127

Re: Coxeter Plane projections

Hmm, not sure what's wrong. It doesn't matter which green cell you select. The important thing is to use "View->Orientation->Look at Selected Cell..." after selecting the cell, and then don't rotate the view again. After selecting cell: https://i.postimg.cc/YGWfkbvF/image.png After "View->Orientatio...
by robertw
Sun Jan 06, 2019 3:11 am
Forum: Stella Forum
Topic: Coxeter Plane projections
Replies: 8
Views: 127

Re: Coxeter Plane projections

It's just a cell-first projection based on the truncated icosidodecahedron cells (green by default). So select one of those, use "View->Orientation->Look at Selected Cell..." to look down that axis, hide all the cells with Ctrl+Shift+H to only show edges/vertices, and of course hit "o" if you didn't...
by robertw
Sun Jan 06, 2019 3:04 am
Forum: Stella Forum
Topic: dividing net pieces
Replies: 1
Views: 48

Re: dividing net pieces

Personally I normally wouldn't, because you'd end up with the base split in two, maybe the two parts connected with tabs somehow. Maybe if that remains underneath then it doesn't matter too much. But you could play with faceting mode, maybe combined with the stellation view to give access to more ve...
by robertw
Fri Jan 04, 2019 2:09 am
Forum: Stella Forum
Topic: Coxeter Plane projections
Replies: 8
Views: 127

Re: Coxeter Plane projections

Hi Benoit, So I think you just want an orthogonal projection rather than a perspective one. You can do this by selecting "View->Orthogonal View" (keyboard shortcut: o) You may also want to select one of the cells and use "View->Orientation->Look at Selected Cell..." to align the model nicely. And th...
by robertw
Wed Jan 02, 2019 4:43 am
Forum: Worlds Kaleid Forum
Topic: Worlds Kaleid 1.2 released!
Replies: 3
Views: 794

Re: Worlds Kaleid 1.2 released!

Hi, thanks for the feedback. Unfortunately it's just for stills, not video, unless you take a bunch of stills carefully and stitch them together into a video, but that's a bit tedious. Or just do a screen video capture via some other means. Would be nice to export videos, but I couldn't figure out a...
by robertw
Tue Jan 01, 2019 7:09 am
Forum: Stella Forum
Topic: Non-Uniform 4D
Replies: 8
Views: 120

Re: Non-Uniform 4D

Yeah maybe some day.
by robertw
Mon Dec 31, 2018 8:44 am
Forum: Stella Forum
Topic: Non-Uniform 4D
Replies: 8
Views: 120

Re: Non-Uniform 4D

Vertex figures only work for uniform polytopes, because it requires all vertices to be equivalent. OFF files are in a simple text format, so you can look inside one and you'll be able to see how they work. But it's easiest to create them via code. Stella4D has menu items to build a prism on the curr...
by robertw
Thu Dec 20, 2018 4:28 am
Forum: Stella Feature Requests
Topic: Augmenting with polyhedra
Replies: 3
Views: 165

Re: Augmenting with polyhedra

Indeed you can already cycle through different matches with the arrow keys.

You can also select a face before putting a polyhedron in memory and it will use that one first if it matches.