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Add PPP2 algorithm for computing contour trees

Gunther Weber requested to merge (removed):ppp2 into master

This merge request adds:

  • a new implementation of the contour tree algorithm (Parallel Peak Pruning 2) which enables the efficient computation of fully augmented contour trees and computation of measures/statistics over the full tree

  • computation of the contour tree that is consistent with marching cubes isosurface extraction

  • an example application for computing the contour tree using the new PPP2 algorithm

  • an example application for selection of isovalues bases on the fully augmented contour tree compute using PPP2

With the new implementation of the contour tree we can now compute the fully augmented contour tree (i.e., the contour tree including all regular vertices), which is critical to compute statistics and segmentations based on the contour tree.

This code was created as part of the ECP Alpine project.

Edited by Gunther Weber

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