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"Russell Towle" <rto### [at] inreachcom> wrote:
> Unusual to see triangular bipyramids. And the thing in the middle looks like
> maybe a hyperbolic octahedron or maybe triangular bipyramid?
see thread "Easter People ..." for some of this
//Astroidal Ellipse or rhombihexacron
#declare Vmin=0;
#declare Vmax=pi*2;
#declare Umin=0;
#declare Umax=pi*2;
#declare F_AEx = function(u,v) {pow(cos(u)*cos(v),3)}
#declare F_AEy = function(u,v) {pow(sin(v),3)}
#declare F_AEz = function(u,v) {pow(sin(u)*cos(v),3)}
spheroid(1.7, 0.3, 0.0, 0.0, 20,10,F_AEx,F_AEy,F_AEz,1)
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