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.
OverlapEnableparameter is deleted. To disable overlap computation, use
OverlapSamplingRatio = 0.
Overlap computation is disabled by default to save some processing time.