Dean, sounds like you might appreciate: http://www.scienceu.com/geometry/facts/solids/coords/
Well, ah, let's just say it doesn't work the way you probably think it does. The polyhedra code is a very complex algorithm that looks at possible faces (combinations of three atoms around a central atom) and determines which are "faces" and which are not. We have: #atoms comb of 3 at a time 4 4!/(3!)(1!) = 4 6 6!/3!3! = 20 8 8!/3!5! = 56 9 9!/3!6! = 84 12 12!/3!9! = 220 20 20!/3!17! = 1140 ... n n(n-1)(n-2)/6 so if you do nothing special, then you will possibly run into the problem with any number more than 9. HOWEVER, the algorithm has a parameter, distanceFactor, that is adjustable, and if you set it smaller, it will work. For example (That second line should not wrap), try: 13 #jmolscript: connect (*) (*) delete;connect (_Fe) (_C);select *;wireframe off;spacefill off;select (_Fe); polyhedra bonds distanceFactor 0.5 Fe 0 0 0 C -0.692 0.000 0.427 C 0.000 0.427 -0.692 C 0.000 0.427 0.692 C 0.692 0.000 -0.427 C -0.427 -0.692 0.000 C -0.427 0.692 0.000 C 0.000 -0.427 0.692 C 0.427 0.692 0.000 C 0.000 -0.427 -0.692 C 0.692 0.000 0.427 C 0.427 -0.692 0.000 C -0.692 0.000 -0.427 As for dodecahedra, that's just too large. I've upped the maximum number of faces to 147, and that takes care of it, but there are a few stray lines, since we are painting more triangles than actually needed. Just the way it goes, I guess.... Bob Dean Johnston wrote: > Has anybody tried to create polyhedra with 12 or 20 vertices? The > documentation seems to indicate that I should be able to go up to 20. > > I’m creating representations of shapes (Platonic solids, actually — > maybe Jmol isn’t just for molecules anymore... :-). I would like to > display an icosahedron and dodecahedron. I’ve created structures with > a central atom surrounded by 12 or 20 atoms, but when I try and create > the polyhedron, I get the following error message: > > Polyhedron error: maximum face(87) -- reduce RADIUS > > I have a feeling it’s creating more polyhedra faces than I want it to > (I only want 20), but I’m not entirely familiar with how it works. > I’ve gotten it to work just fine for tetrahedra and octahedra. Any > insights, corrections, etc. are greatly appreciated. > > My testing page is at: > http://www.otterbein.edu/home/fac/dnhjhns/jmoltest/poly.html > > Dean > >------------------------------------------------------------------------ > >------------------------------------------------------------------------- >This SF.net email is sponsored by DB2 Express >Download DB2 Express C - the FREE version of DB2 express and take >control of your XML. No limits. Just data. Click to get it now. >http://sourceforge.net/powerbar/db2/ > >------------------------------------------------------------------------ > >_______________________________________________ >Jmol-users mailing list >Jmol-users@lists.sourceforge.net >https://lists.sourceforge.net/lists/listinfo/jmol-users > > -- Robert M. Hanson Professor of Chemistry St. Olaf College Northfield, MN http://www.stolaf.edu/people/hansonr If nature does not answer first what we want, it is better to take what answer we get. -- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900 ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Jmol-users mailing list Jmol-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jmol-users
