Low Dimensional Topology

February 7, 2011

New SnapPy 1.3, now with better horospheres!

Filed under: 3-manifolds,Computation and experiment,Hyperbolic geometry,Triangulations — Nathan Dunfield @ 5:25 pm

Marc Culler and I have released version 1.3 of SnapPy, which you can get from the usual place. The main change is a much improved cusp viewer, including labels on the edges and vertices of the associated canonical ideal cellulation. Previous versions of SnapPy gave you a 3D view of the horoball packing which, while pretty, was not very practical; the perspective meant that there were not actually any 2D symmetries of the resulting picture! The new version uses an orthographic perspective that puts the viewers eye at infinity and thus gives the picture a euclidean lattice of symmetries. Also, due to internal changes, the cusp viewer is much faster than it used to be, and should be much less likely to crash on complicated examples.   Some pretty pictures from the new version are follow the jump.

Cusp of s776

Cusp of s776

A triangulation of s776

A triangulation of s776

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