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Feature extraction 3D

Please my case is as follows, I have and adjacency matrix(Graph data structure, 0-1) it's originally mesh having 3d coordinates (XYZ). Now the idea is that I want to extract features, but I read that I have to obtain interest points first then for each I obtain feature vector..Correct?

So if I would like to read the matrix how this could be done? I'm only finding reading images taking .jpg how could it be in my case, and will the process follows normally I mean showing the feature points on my object and like that. Hopefully I'm in the correct place to ask this.

Thank you