Path: utzoo!utgpu!watserv1!ria!pruss
From: pruss@ria.ccs.uwo.ca (Alexander Pruss)
Newsgroups: comp.graphics
Subject: Questions and Answers about Platonic Solids
Keywords: platonic solids
Message-ID: <2421@ria.ccs.uwo.ca>
Date: 5 Mar 91 14:41:06 GMT
Organization: Dept. of Applied Mathematics, Univ. of Western Ontario
Lines: 23

I recently received (indirectly) a set of co-ordinates for the seven platonic
solids originally posted (I think) by awpaeth@watcgl.waterloo.edu.
I wrote some clever code that changed these co-ordinates into a more useful
form for people like me who actually want to look at the solids - the
code takes the different vertex co-ordinates, and figures out which are
connected to form edges and which edges connect to form faces.  Then your
favourite 3d graphic package can be easily used to look at them.
The reason I am posting is first to let people know that this info is
available (if they care ;-) and second is to ask about the 7th solid
in the list, the Icosidodecahedron.  The co-ordinate list of this solid
contains an ominous looking ... which doesn't seem to obviously translate
into extra vertices.  Currently it has 30 vertices (I think) but my program
decides that this means there should be some fractional (2.2 or something)
number of edges in a face which isn't right.
Are there some more vertices?  How many edges/faces should it have and are
all the edges the same length (my program assumes all edges are the same
length to work out # edges, # faces, # edges/face etc. which is true for
all other platonic solids).

What gives?
pat
.