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Surface streamlines

Mathieu Westphal (Kitware) requested to merge mwestphal/vtk:surfaceStreamlines into master

Adding surface streamlines support to vtk by :

the main points are :

  1. Use of a surface tolerance scale at 1.E-5, to ensure even adaptative algorithm like RungeKutta4-5 works, however it is still possible to create dataset wich will not comply with this, A Hard edge with a big vector will always make it fails at some point, is is more visible with surface streamlines but could occur with volume streamlines as well

  2. A new version of FindCell, with a surface specific part wich almmost always find a cell, except when we are really out of domain. It is ensured by always checking findPoint return

  3. Use of surface vector

  4. Snap points using new version of FindCell

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