Add nanoflann to third party
Name: nanoflann
This library will be used as the backend for a point locator, either replacing vtkKdTreePointLocator, or proposing a new one. It outperforms the latter by about by tenfold when fetching points, but is twice as slow to build. Algorithms needed a point locator tend to need to fetch a lot of points, so the performance gains should be significant overall.
Upstream repository: https://github.com/jlblancoc/nanoflann
Hosting project(s) :
vtk/vtk
Maintainers of the fork:
Edited by Yohann Bearzi (Kitware)