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  • $\begingroup$ For the type of region described, the centric will be inside rather than outside the region. $\endgroup$ Commented Aug 8, 2020 at 16:28
  • $\begingroup$ Your title suggests the points you want are on the outside of the region, but the body of your question says "I want to find the coordinates of points that is on the surface". I assumed in my answer that you're asking for the points on the surface. Perhaps you could clarify? $\endgroup$ Commented Aug 8, 2020 at 17:36
  • $\begingroup$ Sorry for my being a bit unclear...My region here refer to the 2D surface in the 3D space without the space that it surrounds inside so the center point should be surrounded by the surface but not on the surface (thus not being in the region). $\endgroup$ Commented Aug 8, 2020 at 19:43
  • $\begingroup$ Thanks for clarifying and improving subject header. $\endgroup$ Commented Aug 9, 2020 at 14:45