Adding surface streamlines
Adding surface streamlines support to vtk by : Using a higher tolarance (*10) 2D Check of cell inclusion Surface vortivity Snapping stream lines point to surface New version of the surface stream tracer New version of the surface streamer tracer, the main point 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. Still use surface vector 4. Snap using new version of FindCell Note: Style is not yet considered, do not loose any time review the style. Correcting style in new code
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