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LagrangianParticleTracker multithread optimizations

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

The improves and optimize the LagrangianParticleTracker multithread implementation by :

  • Avoiding useless allocation
  • Using thread-level variable
  • Avoiding using mutex by doing actual reduction of the output
  • A few bugfixes and memleaks fixes
  • Add QuadraticRoot to vtkMath
  • Add a vtkBilinearQuadIntersection class
Edited by Mathieu Westphal (Kitware)

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