title: Reconstruction a 3D point from multiple 2D points?
body: <p>OpenCV contains a lot of support for 3D reconstruction from stereo cameras. In my case, I have <em>six</em> calibrated cameras (intrinsic and extrinsic), and I'd like to take common 2D points (say, of a test sphere) and get the corresponding 3D position. Any thoughts on how to do this?</p>
  
  <p>What I have: <br>
  1) Calibration parameters for multiple cameras <br>
  2) 2D position of test sphere (in each image plane)</p>
  
  <p>What I want to get: <br>
  1) Corresponding 3D point of test sphere</p>