Search found 550 matches

by robertw
Mon Jan 28, 2008 2:55 pm
Forum: Stella Feature Requests
Topic: Creating convex polychora from vertices
Replies: 14
Views: 41174

Actually there is no way to define edges in an OFF file, but yes you often don't need to define cells (although sometimes you do). I'll make it possible to load a vertex-only 4D OFF file at some point. If you just want a convex hull of the verts, you're not going to want to figure out how to link th...
by robertw
Sun Jan 27, 2008 4:35 am
Forum: Polyhedron Models
Topic: My Next Project
Replies: 9
Views: 27441

Not sure, but Stella can take an .OFF file as input, so if you have any programming skills, you may be able to write a program to output a helix in OFF format. See http://www.software3d.com/StellaManual.php?prod=stella4D#import and http://www.geomview.org/docs/html/geomview_41.html Something occurre...
by robertw
Sat Jan 26, 2008 3:28 am
Forum: Polyhedron Models
Topic: My Next Project
Replies: 9
Views: 27441

Squeaky wrote:WHAT SHAPE WILL BE PRODUCED
IF I ROTATE EACH 10 degree SLICE/SECTION SAY 2.5 degrees.
WHEN ASSEMBLING?

If I keep everything aligned (NO ROTATION) then I produce a torus.
A helix?

Rob.
by robertw
Fri Jan 25, 2008 10:06 am
Forum: MineSweeper3D Feature Requests
Topic: Ideas For New Boards
Replies: 11
Views: 37282

Re: Iquipadah section

Jabe wrote:I would like to see the .5 section of iquipadah as seen in the pic.
Hmm, pretty weird-looking board, and a meaningless shape to most people.

Rob.
by robertw
Fri Jan 25, 2008 4:07 am
Forum: MineSweeper3D Feature Requests
Topic: Ideas For New Boards
Replies: 11
Views: 37282

Re: Or Another Torus

I would like to see a nice open torus (perhaps a genus 1), where it is easier to see what you are doing. Like taking an Icosidodecahedron (ID), and excavating two triangular hebesphenorotundas (J92) from opposite ends. That's quite a nice model. Probably still a bit hard to see how some of the tile...
by robertw
Tue Jan 22, 2008 11:32 am
Forum: General
Topic: MazeRunner
Replies: 7
Views: 27768

Interesting idea, and maybe not too hard given the code I already have to start with. How do you see it working? Would the view be of the whole shape like in MineSweeper3D, with say the closest point (or a bit above) being your current position, then you turn and move with the mouse? Or would the vi...
by robertw
Tue Jan 22, 2008 6:12 am
Forum: Stella Forum
Topic: More 4D compounds now available
Replies: 51
Views: 109364

Re: Scaliforms

Dinogeorge wrote:The polychora do have coincident edges, so maybe that's the problem :?:
Maybe, although I thought there were other ones like that which worked (been a while since I looked at this stuff). Send me the .stel files anyway and I'll have a look.

Rob.
by robertw
Tue Jan 22, 2008 2:40 am
Forum: Stella Forum
Topic: More 4D compounds now available
Replies: 51
Views: 109364

No, Stella4D inclused all known uniform polychora, but not all the scaliforms, so please send them through if you make any :wink:

Rob.
by robertw
Mon Jan 21, 2008 6:42 am
Forum: Polyhedra
Topic: What was your introduction to polyhedra?
Replies: 21
Views: 66203

It can indeed be done in Stella, although it was a little tricky.

Click here to download the .stel file

Once in Stella you can print out the nets :D

Image
by robertw
Mon Jan 21, 2008 6:01 am
Forum: Stella Forum
Topic: How do I modify a solid?
Replies: 6
Views: 32424

Re: How do I modify a solid?

...Then stellate it using the stellation diagram (which is very wide because there's no symmetry and the stellachunks are handled one at a time). Twelve of the rectangles in the second row of the diagram correspond to stellachunks that lie on top of the pentagonal faces. You are referring to the ce...
by robertw
Mon Jan 21, 2008 3:51 am
Forum: Stella Feature Requests
Topic: Polytope compound generation
Replies: 6
Views: 22233

Another idea would be to make a 'duplicate object by rotation about the center' feature - for example: Lets say you wanted to make a compound of 5 icoes - start with ico (vertex centered), (rotate xy 36 degrees rotate zw 36 degrees) duplicate ico, (rotate xy and zw another 36 degrees) duplicate ico...
by robertw
Mon Jan 21, 2008 3:47 am
Forum: Stella Feature Requests
Topic: Polytope compound generation
Replies: 6
Views: 22233

One thing that might not be too difficult to implement would be an option for the "ADD/BLEND from Memory" feature: Allow the user to select a vertex in the target polytope (3D or 4D) and in the memorized polytope, and when the ADD operation is done, the memorized polytope is placed so that its sele...
by robertw
Sun Jan 20, 2008 1:52 pm
Forum: Polyhedra
Topic: What was your introduction to polyhedra?
Replies: 21
Views: 66203

Squeaky wrote:I wonder .... do you still have copies of your drawings for the net for the four tetrahedra?

Would you share them with the rest of the forum?

I would love to make this model some time in the future.
I'm sure the model can be made with Stella. I'll have a think about it and get back to you.

Rob.
by robertw
Sat Jan 19, 2008 12:16 pm
Forum: Polyhedron Models
Topic: Posting Images
Replies: 6
Views: 22656

It's the same size as the image was on your computer to start with. Do you have software for resizing images first?

If you copy the text required from photobucket, you don't need to also click the Img button (it already includes the [IMG] tags).

Rob.
by robertw
Sat Jan 19, 2008 2:47 am
Forum: Polyhedron Models
Topic: Posting Images
Replies: 6
Views: 22656

Images must already be uploaded elsewhere first, then you include them here by using a link to them.

I suggest you create an account at http://photobucket.com
Then you can upload all the images you want, and it tells you what text you need to include in forums like this to reference them.

Rob.