Hi Rob,
Just been playing with MoStella Free, so I thought I'd drop you a line. First time in many years that I have had a box to run one of your apps on natively, this time a Planet Gemini PDA running Android. Thoughts follow in random order:
In faces+wireframe view, the frame tends to disappear ...
Search found 91 matches
- Sun Oct 07, 2018 10:50 am
- Forum: Stella Forum
- Topic: Announcing MoStella! Mobile app full of polyhedra.
- Replies: 3
- Views: 66106
- Sat Sep 24, 2016 9:03 am
- Forum: Polyhedra
- Topic: Coloring of Snub Dodecahedron
- Replies: 3
- Views: 70634
Map colouring is a complex and difficult topic. The four-colour theorem, that to always avoid even edges meeting you need four colours, was first proved by a computer exhausting all the possibilities and, I think, more recently proved analytically. The problem you pose is way more complex.
I think ...
I think ...
- Wed Aug 10, 2016 8:49 am
- Forum: Polyhedron Models
- Topic: Quasicrystals
- Replies: 11
- Views: 107374
- Tue Aug 09, 2016 9:01 am
- Forum: Polyhedron Models
- Topic: Quasicrystals
- Replies: 11
- Views: 107374
I understand what you were talking about, but for whatever reason the numbers were still not right. By the way, the solid in the middle between the two pyramids would be a triangular antiprism instead of square antiprism :) Would the length of the space diagonal always be equally divided by the 3 ...
- Mon Aug 08, 2016 9:04 am
- Forum: Polyhedron Models
- Topic: Quasicrystals
- Replies: 11
- Views: 107374
- Sun Aug 07, 2016 7:03 pm
- Forum: Polyhedron Models
- Topic: Quasicrystals
- Replies: 11
- Views: 107374
- Sat Aug 06, 2016 6:47 pm
- Forum: Polyhedron Models
- Topic: Quasicrystals
- Replies: 11
- Views: 107374
- Sat Jun 11, 2016 6:03 am
- Forum: Polyhedron Models
- Topic: Printing Nets
- Replies: 2
- Views: 53451
- Mon Aug 24, 2015 9:11 am
- Forum: Stella Forum
- Topic: How does Stella4D determine the dual?
- Replies: 31
- Views: 291400
On the hyperbolic honeycomb shown:
We can tell from its Schläfli symbol {3, 7, 3} that it is self-dual because the symbol is symmetrical.
I love the way it brings to life what one might call hyperbolic perspective. Traditionally a hyperbolic plane is represented as a disc, with objects of the same ...
We can tell from its Schläfli symbol {3, 7, 3} that it is self-dual because the symbol is symmetrical.
I love the way it brings to life what one might call hyperbolic perspective. Traditionally a hyperbolic plane is represented as a disc, with objects of the same ...
- Sun Aug 23, 2015 7:28 pm
- Forum: Stella Forum
- Topic: How does Stella4D determine the dual?
- Replies: 31
- Views: 291400
- Sun Aug 23, 2015 4:27 pm
- Forum: Stella Forum
- Topic: How does Stella4D determine the dual?
- Replies: 31
- Views: 291400
- Sun Aug 23, 2015 1:49 pm
- Forum: Stella Forum
- Topic: How does Stella4D determine the dual?
- Replies: 31
- Views: 291400
Projective geometry is a funny thing. Despite its most pure form having no concept of angle or distance (i.e. no concept of coordinates), it is most often taught using a Euclidean metric with yet another coordinate bolted on top. let me know if you get baffled.
Also, be warned - projective geometry ...
Also, be warned - projective geometry ...
- Sun Aug 23, 2015 8:32 am
- Forum: Stella Forum
- Topic: How does Stella4D determine the dual?
- Replies: 31
- Views: 291400
And, as noted in last reply, I'm curious to see what might come from using it as the surface of reciprocation.
Polar reciprocation is a construction in pure projective geometry. This geometry has no idea of metric, i.e. of distance or angle. To a projective geometer a sphere, ellipsoid, hyperbolic ...
Polar reciprocation is a construction in pure projective geometry. This geometry has no idea of metric, i.e. of distance or angle. To a projective geometer a sphere, ellipsoid, hyperbolic ...
- Fri Aug 21, 2015 9:32 am
- Forum: Stella Feature Requests
- Topic: Plane tilings
- Replies: 0
- Views: 80682
Plane tilings
Would it be possible for Stella to explore plane tilings as well as polyhedra?
There seem to be two approaches to tiling:
Symmetries (e.g. kaleidoscopes) in the plane can generate tilings, much as spherical ones generate polyhedra. There are even some "dense" or overlapping tilings analogous to ...
There seem to be two approaches to tiling:
Symmetries (e.g. kaleidoscopes) in the plane can generate tilings, much as spherical ones generate polyhedra. There are even some "dense" or overlapping tilings analogous to ...
- Fri Aug 21, 2015 8:48 am
- Forum: Stella Forum
- Topic: How does Stella4D determine the dual?
- Replies: 31
- Views: 291400