message: ENH: comment AddProjection function
diff: @@ -95,7 +95,10 @@ public:
  const VectorType &detectorColumnVector);
  - /** Add projection from a projection matrix. */
  + /** Add projection from a projection matrix. A projection matrix is defined
  + * up to a scaling factor. The function here Assumes that the input matrix
  + * pMat is normalized such that pMat*(x,y,z,1)'=(u,v,1)'.
  + * This code assumes that the SourceToDetectorDistance is positive. */
  bool AddProjection(const HomogeneousProjectionMatrixType &pMat);
  /** Empty the geometry object. */
  