# How to make 3D object smooth?

This thread considers mathematical methods here to make the 3D object smooth but this question consider how to achieve the goal of smoothing a 3D object in Mathematica.

I want to get smoother geometrical objects, some messing up here. Suppose for example a tetrahedron where I would like to make the corners rounded with either convolution or interpolation. I would have to select two control points on different faces and then select one adjusting point -- I could use a NURBS aka spline approximation with a polynomial then aka Mathematica's BezierCurve[...] command. Now I am trying to do a ready command that would do this for me without me traversing different vertices and making sure of selecting right faces for control/adjusting points. Example data about the coordinates with the tetrahedron's faces here.

Does Mathematica have some ready function to do Interpolation or Convolution for geometric objects?

I think the by-far-easiest solution is to use Convex hull but it hides some information if you have a lot of details. This is an answer in progress.

Different methods

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Could you post some simple example to play with? –  István Zachar Mar 22 at 15:19
Here's a simple, but not very good approach: << PolyhedronOperations; Graphics3D@ Nest[Truncate[#, .2] &, N@PolyhedronData["Tetrahedron", "Faces"], 5] –  Szabolcs Mar 22 at 15:21
Use a RegionFunction` that includes points within some epsilon>0 of the boundary? –  Daniel Lichtblau Mar 23 at 23:02