title: Newell's Method to Calculate Plane Equation of Concave Polygon - Improvements?
body: <p>3 points are needed to define a plane.  Newell's method is known to fail if the 3 points are chosen around a concave corner - the normal of the resulting plane will point in the direction opposite to the expected one.</p>
  
  <p>Are there any improvements to Newell's method that help in choosing a valid starting point?  Or is there an alternative algorithm that doesn't have this issue?</p>