init_from_matrix
        
        Description:
        public void init_from_matrix (
Matrix matrix)
        
 
        
          Extracts a euler rotation from the given matrix and initializses this with the component 
            x, y and z rotation angles.
          Parameters:
          
            
              | this | The Euler angle to initialize | 
            
              | matrix | A Matrix containing a rotation, but no scaling,  mirroring or skewing. |