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Implementation change in vtkDIYUtilities::Link

Yohann Bearzi (Kitware) requested to merge yohann.bearzi/vtk:ghost-refactoring into master

This MR contains 2 main changes.

vtkDIYUtilities::Link has been rewritten because the all_to_all call can be avoided.

vtkDIYGhostUtilities is slightly refactored. This refactoring will make it easier to add compatibility to vtkUnstructuredGrid and vtkPolyData. In particular:

  • Ghost allocation is moved outside of the link map generation method.
  • Unnecessary links are weeded out prior to exchanging structural information between blocks by looking at bounding box intersections. This will become relevant for other input data types such as vtkUnstructuredGrid.
  • Missing documentation has been added.
  • Functions have been renamed. The ones relevant for grids have been renamed with ForGrid at the end of the name. It will provide better readability when other data set types will be added.
Edited by Yohann Bearzi (Kitware)

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