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Commit 541b10c4 authored by Alexandru Fikl's avatar Alexandru Fikl Committed by Andreas Klöckner
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make torus parametrization a bit smoother

Before the torus was constructed by
* evaluating the vertices on the torus
* interpolating the unit nodes to each flat element
* ballooning up the nodes to lie on the torus again

Now, it is constructed by
* getting the vertices and nodes on the flat (u, v) grid
* evaluating the vertices and nodes on the torus at the points from
  the flat grid

This results in slightly curvier looking elements.
parent 19e7d762
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