Search found 473 matches

by robertw
Sat Apr 13, 2019 2:16 pm
Forum: Polyhedron Models
Topic: Genus-41 Stewart toroid
Replies: 3
Views: 51

Re: Genus-41 Stewart toroid

It's a fun investigation of something similar to Johnson solids but with one or two restrictions removed. Been a long time since I read it though.
by robertw
Tue Apr 09, 2019 2:13 pm
Forum: Polyhedron Models
Topic: Genus-41 Stewart toroid
Replies: 3
Views: 51

Genus-41 Stewart toroid

I just finished a paper model of a new Stewart toroid I discovered a while ago. This has all regular faces and is non-self-intersecting, with genus 41. All edges of the convex hull are also edges of the model (another one of Stewart's criteria). See my page about it at https://www.software3d.com/Web...
by robertw
Wed Feb 27, 2019 12:56 am
Forum: Stella Forum
Topic: Non-Uniform 4D
Replies: 17
Views: 958

Re: Non-Uniform 4D

No sorry, you can't do that. The built-in ones that ask are not from files at all, they are built directly into the code and can handle asking for a parameter.
by robertw
Sun Feb 17, 2019 8:50 am
Forum: Stella Feature Requests
Topic: Curved Shapes
Replies: 1
Views: 186

Re: Curved Shapes

Stella probably won't ever really handle curved surfaces well, although maybe it could have a way to smooth a polyhedron by creating more geometry. Another one for the todo list.
by robertw
Mon Feb 11, 2019 12:24 pm
Forum: Polyhedra
Topic: Solved twisty puzzle
Replies: 5
Views: 361

Re: Solved twisty puzzle

And I've never even listened to King Crimson :)
by robertw
Sun Feb 10, 2019 2:14 pm
Forum: Polyhedra
Topic: Solved twisty puzzle
Replies: 5
Views: 361

Re: Solved twisty puzzle

The standard Rubik's cube and many of its variations aren't too hard once you know a few basic principles. I gave a 7x7x7 cube, a teraminx and various other twisty puzzles which aren't too hard, although they may take a long time due to the number of pieces. This one though, the "curvy starminx", wa...
by robertw
Sun Feb 10, 2019 2:08 pm
Forum: Polyhedron Models
Topic: Marshmallow model
Replies: 2
Views: 237

Re: Marshmallow model

We certainly ate a few marshmallows along the way. And the model didn't survive the night.
by robertw
Sun Feb 10, 2019 3:49 am
Forum: Polyhedra
Topic: Solved twisty puzzle
Replies: 5
Views: 361

Solved twisty puzzle

After sitting scrambled on my shelf for years, I finally figured out how to solve this beautiful puzzle! Seen here sitting on the page of scribbles made while solving.

https://www.facebook.com/photo.php?fbid ... 1739136522


Image
by robertw
Sun Feb 10, 2019 3:44 am
Forum: Polyhedron Models
Topic: Marshmallow model
Replies: 2
Views: 237

Marshmallow model

Here's a model I made with marshmallows and toothpicks at MathsJam Melbourne. It could be any of the four polyhedra shown, as they all have the same edges. Three are uniform, the 4th is the compound of 5 cubes. Interesting that you can form regular triangles, squares, pentagons, and pentagrams from ...
by robertw
Fri Feb 08, 2019 7:38 am
Forum: Stella Forum
Topic: Non-Uniform 4D
Replies: 17
Views: 958

Re: Non-Uniform 4D

OK glad you figured it out. A warning rather than crashing would have been more helpful. I'll look into that.
by robertw
Thu Jan 31, 2019 5:43 am
Forum: Stella Feature Requests
Topic: all edges of equal length
Replies: 1
Views: 192

Re: all edges of equal length

Not yet. I did try this as a new feature, but not in a released version yet.
by robertw
Wed Jan 23, 2019 5:13 am
Forum: Stella Forum
Topic: STL export orientation
Replies: 4
Views: 286

Re: STL export orientation

I'm still trying to get my slicer (3D printing CAM software) to recognize it as a solid object You can probably fix this by exporting from the stellation view rather than the base view. Polyhedra like this with intersecting faces will be exported with intersecting faces, and some slicers can't hand...
by robertw
Tue Jan 22, 2019 2:30 pm
Forum: Stella Forum
Topic: STL export orientation
Replies: 4
Views: 286

Re: STL export orientation

Try using look-at instead of sit-on. The problem is that Stella exports a model with Y up, whereas some STL software uses Z up. I should add an option for this some time. In the meantime, using look-at instead of sit-on fixes it.
by robertw
Sun Jan 20, 2019 5:40 am
Forum: Stella Forum
Topic: Non-Uniform 4D
Replies: 17
Views: 958

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: 17
Views: 958

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.