3D Surface plot of a body for which the xyz coordinates are given

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I have an extremely large (in the order of 1-3 million data points) xyz array that defines a body in 3D space. I would like to know if it is possible to:
1- Limit the array data only to the surface of the body (that is, the outermost points)
2- Make a 3D figure of the body obtained form 1
3- "Dilute" the dataset to make operations faster?

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