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Change susbsampling strategy in overlap computation

Nicolas Cadart requested to merge OverlapSampling into master

  • VoxelGrid sampling is quite slow, and leads to smaller overlap values. Now, the idea is to use only a subset of points to compute overlap on. The user can provide a ratio of points to use, between 0 and 1.

  • This also accelerates the overlap computation by approximately 20% by using OpenMP reduction and avoid using vectors for KNN search.

  • The OverlapEnable parameter is deleted. To disable overlap computation, use OverlapSamplingRatio = 0.

  • Overlap computation is disabled by default to save some processing time.

@julia.sanchez PTAL

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