Search found 50 matches

by ndl
Tue Apr 13, 2021 5:12 pm
Forum: Stella Forum
Topic: Calculating duals
Replies: 1
Views: 7

Calculating duals

I was looking at the vertex figure of the scaliform polychoron "bidex", and I noticed that when stella makes the dual it comes out a little skewed. It's supposed to be self-dual (as can be seen by the cell of the dual of bidex and because it's both a partial stellation of the dodecahedron and a part...
by ndl
Tue Apr 06, 2021 5:12 pm
Forum: Stella Forum
Topic: Selecting issue
Replies: 4
Views: 105

Re: Selecting issue

It happens in measurement mode selecting any type of element, and it will instead select a completely different element can be of different type. It's consistent in that any given element will always produce the same selection results. It's any polyhedron even simplest (but not with 4D that works fi...
by ndl
Fri Apr 02, 2021 10:36 pm
Forum: Stella Forum
Topic: Selecting issue
Replies: 4
Views: 105

Re: Selecting issue

It is higher dpi, but I'm very exact in my selecting. Also it's not selecting something behind, it's selecting a completely different element, and only when I click directly on an element. In faceting it's only a problem in "faceting mode", but with measuring tool it's always a problem.
by ndl
Thu Apr 01, 2021 7:54 pm
Forum: Stella Forum
Topic: Selecting issue
Replies: 4
Views: 105

Selecting issue

Hi,

I just got a new computer and installed Stella 4d with the same installer that I had before, but I'm having a new issue that when I try to select vertices (measuring or faceting) it will often select something else instead of the vertex I was intending to select.
Any help would be appreciated.
by ndl
Fri Nov 06, 2020 5:22 pm
Forum: Polyhedra
Topic: New Uniform Polychora
Replies: 15
Views: 3090

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: 944

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: 15
Views: 3090

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: 944

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: 6060

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: 6060

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: 6060

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: 6060

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: 6598

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: 6598

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: 6598

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.