title: Alpha shapes in 3D
body: <p>Is there an "alpha shape" function in 3 dimensions in python, other than the CGAL python bindings?</p>
  
  <p>Alternatively, is there a way to extend the example below into 3D? </p>
  
  <p>2D example: <a href="https://stackoverflow.com/questions/17553035/draw-a-smooth-polygon-around-data-points-in-a-scatter-plot-in-matplotlib">draw a smooth polygon around data points in a scatter plot, in matplotlib</a></p>
  
  <p>I'm currently calculating volume using this <a href="https://stackoverflow.com/questions/24733185/volume-of-convex-hull-with-qhull-from-scipy/24734583#24734583">ConvexHull</a> example, but for my purposes the volumes are inflated due to the "convex" constraint.</p>
  
  <p>Thanks, </p>