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new options and format for HTGXMLReader/Writer. UnstructuredToHTG (YA31).

Jérôme Dubois requested to merge JeromeDuboisPro/vtk:htg-ioxml-reader-writer-new-options_fixed into master

Update vtkXMLHTGReader/Writer to store HTG data by Tree, and BFS inside each tree.

Benefits:

  • possible to load a selection of HTs and/or limit level actually read
  • globalid is removed, and cells masked (thresholdHTG, shallow copy HTG and bitmask updated) are not kept when possible
  • other optimizations Also added a Unstructured to htg filter. this is actively used by us to convert YA31 full resolution data from Unstructured (TB-AMR) to HTG.

Will not work with Unstructured non TB-AMR to begin with.

@yohann.bearzi I had conflicts because HTG changed due to GhostCells. Originally I messed up, so could you please review the changes?

@patchett2002 you should be interested in this: YA31 to HTG conversion, read by HT and/or by limited depth = our paper from eurovis19

@sebastien.jourdain You sure want to follow this

@demarle FYI Regards, Jérôme.

Edited by Mathieu Westphal (Kitware)

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