leech@homer.cs.unc.edu (Jonathan Leech) (04/17/91)
Archive-name: math/geometry/spheroid/1991-04-15 Archive: ftp.cs.unc.edu:/pub/sphere.c [128.109.136.77] Original-posting-by: leech@homer.cs.unc.edu (Jonathan Leech) Original-subject: Re: recursive sphere tesselation from tetrahedral seed Reposted-by: emv@msen.com (Edward Vielmetti, MSEN) In article <1991Apr15.171109.2625@rice.edu>, fontenot@comet.rice.edu (Dwayne Jacques Fontenot) writes: |> I have been playing with recursive triangular sphere tessellations. Starting |> with an octahedron works beautifully... |> But, the tetrahedral tessellation is giving me some strange results. |> My question is this; is there a fundamental problem with starting with a |> tetrahedron? I cannot think of one... any replies will be greatly appreciated. I think it's just a bit odd-looking for the first few levels due to the odd symmetry of a tetrahedron compared to an octahedron, which has 3 perpendicular symmetry planes. It looks fine by the 3rd or 4th subdivision level. While checking this out, I modified my sphereoid generator (the one mentioned in the FAQ) to start with either tetrahedrons or octahedrons (somebody was going to contribute an icosahedron but hasn't yet). Interested parties can retrieve it by anonymous ftp from ftp.cs.unc.edu:~pub/sphere.c -- Jon Leech (leech@cs.unc.edu) __@/ "I met a wonderful new man. He's fictional, but you can't have everything." - Cecelia, _The Purple Rose of Cairo_ -- comp.archives file verification ftp.cs.unc.edu -rw-r--r-- 1 1658 200 8260 Apr 15 18:33 /pub/sphere.c found spheroid ok ftp.cs.unc.edu:/pub/sphere.c