title: Good geometry library in python?
body: <p>I am looking for a good and well developed library for geometrical manipulations and evaluations in python, like:</p>
  
  <ul>
  <li>evaluate the intersection between two lines in 2D and 3D (if present)</li>
  <li>evaluate the point of intersection between a plane and a line, or the line of intersection between two planes</li>
  <li>evaluate the minimum distance between a line and a point</li>
  <li>find the orthonormal to a plane passing through a point</li>
  <li>rotate, translate, mirror a set of points</li>
  <li>find the dihedral angle defined by four points</li>
  </ul>
  
  <p>I have a compendium book for all these operations, and I could implement it but unfortunately I have no time, so I would enjoy a library that does it. Most operations are useful for gaming purposes, so I am sure that some of these functionalities can be found in gaming libraries, but I would prefer not to include functionalities (such as graphics) I don't need.</p>
  
  <p>Any suggestions ? Thanks</p>