Element visibility in parallel VTU

wenqingrequested to merge
wenqing/ogs:partmesh_ghost_flag_output into master

This PR realizes the element visibility in parallel VTU by using vtkGhostType for elements such that

  1. all regular elements are visible with vtkGhostType=0,
  2. ghost elements are visible in a unique partition to avoid overlapping.

The element visibility is computed only in partmesh to save computation and communication in running parallel ogs.

  1. Feature description was added to the changelog. To be added before merging.
  2. Tests covering your feature were added? Tested it locally. The following figure shows the test result after applying two Paraview filters: RemoveGhostInformation and CleantoGrid: Screenshot_from_2020-07-02_16-41-45 The following figure shows the vtkGhostType of partitions. ghost_visible2

Input files and result file: cube_1.tar.xz output.tar.xz

  1. Any new feature or behavior change was documented? to be added.

Closes #2815 (closed)

As discussed in MR #3022 (closed), two commits were added for Closes #3022 (closed) as well.

Edited by wenqing

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