[ADD #361] Added feature to delete small connected voxel groups
* The algorithm is intended to grouup voxels that have surfaces with the same * normal vector. This feature helps to remove small groups. Obviously trees * by nature have points that lead the Principal Component Analysis to * surfaces that have very different Eigen Vectors of the smallest Eigen Value * that is the normal vector in the case of surfaces. * * Other feature: Removing voxels by a point count per voxel.
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