Above image shows a plane. I would want to find the points which represent the inner spacing. Something like the fourth image at http://cgm.cs.mcgill.ca/~godfried/teaching/projects97/belair/alpha.html .
I was attempting Concavehull with an alpha of 0.1 but it does not makes sense. Attached is the hull with alpha = 0.1. On increasing alpha, the points become even sparse. What would be a good way to get inner points?