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Interpolate input dataset's field variables to vortex cores

Spiros Tsalikis requested to merge spiros.tsalikis/vtk:interpolation-in-parallel-vectors into master

vtkVortexCore's output points now include the interpolated variables of the input points. To accomplish that, vtkParallelVectors, which is called inside vtkVortexCore, calculates the interpolation weights while visiting the triangles of each cell, and later on, uses the weights to calculate the interpolation values for each variable.

This MR addresses the issue #18315 (closed).

Edited by Spiros Tsalikis

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