ReducePointCloud command is simplistic

The ReducePointCloud command removes random points rather than inner points or isolated points. Generally the point cloud describes a surface. Any point which is inner and isolated probably represents random noise. It would be natural to remove these points rather than randomly chosen points.

Yes it does.

https://docs.mcneel.com/rhino/8/help/en-us/index.htm#commands/reducepointcloud.htm#(null)

I don’t think this is accurate.

If you need another algorithm, you might try CloudCompare.

– Dale

You can’t beat Geomagic’s decimation for point clouds or meshes. It’s not cheap but if you are doing this a lot its will save time and improve the quality of result.

It has options to remove outliers, set point spacing (or triangle edge length), curvature sensitivity, set target # of points (or triangles).

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