Search found 46 matches

by ndl
Fri Nov 06, 2020 5:22 pm
Forum: Polyhedra
Topic: New Uniform Polychora
Replies: 13
Views: 1938

Re: New Uniform Polychora

Mecejide wrote:
Thu Nov 05, 2020 10:26 pm
Update: 2 more uniforms (pecuexidfap and pecuexdap) were recently found. The attached file contains their verfs plus several scaliforms’ verfs.
Can you post 1850-1853 also? Thanks
by ndl
Mon Oct 05, 2020 4:22 pm
Forum: Stella Feature Requests
Topic: Category 26
Replies: 2
Views: 677

Re: Category 26

I found it in Cat24. Thanks.
by ndl
Mon Oct 05, 2020 3:10 am
Forum: Polyhedra
Topic: New Uniform Polychora
Replies: 13
Views: 1938

Re: New Uniform Polychora

Can someone post the .stel files on this forum? Just put them in .zip and they will post just fine. Thanks
by ndl
Mon Oct 05, 2020 3:08 am
Forum: Stella Feature Requests
Topic: Category 26
Replies: 2
Views: 677

Category 26

Category 26 from Bower's webpage seems to be totally missing from the Stella4D library. I created the verfs of first 2 (1462 and 1463) very easily by augmenting inwards the siddapady verf with the tigaghi verf. Files are attached.
by ndl
Wed Aug 28, 2019 5:46 pm
Forum: Stella Forum
Topic: 4D stellations
Replies: 8
Views: 5476

Re: 4D stellations

I've had some success with these stellations, I just have one more question (for now): Is there an easy way to reverse a polyhedron's orientation in a given symmetry (tetrahedral for example) to correctly blend it with another model. What I have been doing (which only works sometimes) is to export i...
by ndl
Fri Aug 23, 2019 3:43 am
Forum: Stella Forum
Topic: 4D stellations
Replies: 8
Views: 5476

Re: 4D stellations

I used a more exact calculation for the inradius and it solved the problem. I think the pieces that were supposed to line up didn't because it wasn't exact enough.
by ndl
Mon Aug 19, 2019 9:18 pm
Forum: Stella Forum
Topic: 4D stellations
Replies: 8
Views: 5476

Re: 4D stellations

So I figured out a convoluted way to do it: First I used the arcsine of height of the dual from vertex first projection to another level of vertices divided by the chord length to that vertex. That gives me the angle to tangent realm. Then I used one over the cosine of that angle times half of that ...
by ndl
Sun Aug 18, 2019 4:33 am
Forum: Stella Forum
Topic: 4D stellations
Replies: 8
Views: 5476

4D stellations

I wanted to create 3D stellation patterns for 4D regulars, and I figured out how to do it I'm just missing one step that maybe someone would be able to help me out with. The patterns just consist of sets of planes in a 3D realm and are easy to create with Stella. The problem I have is how do I calcu...
by ndl
Tue Jun 11, 2019 3:29 am
Forum: Stella Forum
Topic: 4D Compounds from verf
Replies: 9
Views: 5995

Re: 4D Compounds from verf

Ok got it thanks
by ndl
Fri Jun 07, 2019 5:31 am
Forum: Stella Forum
Topic: 4D Compounds from verf
Replies: 9
Views: 5995

Re: 4D Compounds from verf

Yes they are still two faces in the total count, but Stella is able to differentiate types for viewing. In 4D that is not the case, it considers them all the same type of cell and you can't display the different instances. Also in the cell viewing option it will say "x cells of this type" referring ...
by ndl
Wed Jun 05, 2019 12:47 am
Forum: Stella Forum
Topic: 4D Compounds from verf
Replies: 9
Views: 5995

Re: 4D Compounds from verf

Another thing that makes compounds confusing in stella 4D is that in the info it counts each cell and vertex separately even the ones that are corealmic/coincident.
Also I couldn't rename the duals of 4Ds created from verf without resaving them as straight 4Ds.
Thanks for all your help.
by ndl
Tue Jun 04, 2019 4:55 am
Forum: Stella Forum
Topic: 4D Compounds from verf
Replies: 9
Views: 5995

Re: 4D Compounds from verf

I was able to make more compounds from verfs if I facetted that 10gax one that was built in and modifying the 5oct compound:
Compound verfs.zip
(6.23 KiB) Downloaded 209 times
But I couldn't get any others to work.
by ndl
Sun May 19, 2019 2:35 am
Forum: Stella Forum
Topic: 4D Compounds from verf
Replies: 9
Views: 5995

Re: 4D Compounds from verf

If I take the compound of 10gax included with Stella4D, choose the vertex figure, press convert to base model, then try to create Uniform 4D it doesn't work. So what is the way you created the original file that allows it to work?
by ndl
Tue May 14, 2019 6:49 pm
Forum: Stella Forum
Topic: 4D Compounds from verf
Replies: 9
Views: 5995

4D Compounds from verf

I'm having inconsistency in being able to create 4D compounds from compound verf. Sometimes it works and sometimes not even from the same verf, for example the compound of 2 icosahedra should create a compound of 10 ex, but I was only able to do that once and now it doesn't work. Also 2 dodecahedra ...
by ndl
Thu Feb 28, 2019 2:35 am
Forum: Stella Forum
Topic: Non-Uniform 4D
Replies: 17
Views: 10742

Re: Non-Uniform 4D

2nd part...