Help needed with SelDup and SelDupAll

Rhino experts

I have a file of a topo surface represented by points extracted from a mesh. # of point are rounghly 97K. I noticed that most are exact duplicates.

So I used SelDup and SelDupAll to delete all duplicate points and leave behind only one point per each location. When I execute this all the points get deleted except for 2 or 3. This is undesirable but I know Im doing something wrong.

How can I achieve this in rhino 5. I attached the file and hope someone can help? Sorry if asked before?Mesh-20171122_RepairExtractPts.3dm (1.1 MB)

Hello - it looks like you can WeldVertices on this mesh - window around the whole mesh to get all the vertices, then ExtractPt and not get any dups.

-Pascal

Pascal thx for your suggestion that does sound like an interesting workflow…I will try this and report back…

Cheers