Camera settings : 
 Zoom : Wheel-Scroll 
 Pan : Mouse-Wheel and Drag
 Rotate : Key-CTRL + Mouse-Right and Drag
 Center : Key-'Space' 
 Type : Key-O ( orthographic ) 
        Key-P ( perspective ) 
                        
 Toggle Auto-rotation : Key-R 
                        
 Toggle Show-Dimension : Key-D

 Toggle Show-Cube : Key-C

 Toggle Show-Frame : Key-F

 Toggle Show-Grid : Key-G