ideas for contour tree path foward

[cyrush]

1. A contour tree extract.

Uses VTK-m to compute a contour tree and saves the arrays representing the tree to an HDF5 file using conduit

2. A contour tree segmentation filter

Uses VTK-m to compute a contour tree and uses the contour tree to produce a mesh field that labels elements based on the contour tree results.

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For using the VTK-m contour tree filter, which uses VTK-m Partitioned Datasets, here is an example in VTK-h that is using a Partitioned Dataset.

ascent/src/libs/vtkh/filters/ParticleAdvection.cpp

Line 37 in a5f51b4

void ParticleAdvection::DoExecute()

The relay filters provide an example of implementing an extract:

ascent/src/libs/ascent/runtimes/flow_filters/ascent_runtime_relay_filters.cpp

Line 673 in a5f51b4

RelayIOSave::execute()

Your case should be much simpler than this, if you need help sketching out a straw man let me know.