Zoom Dynamic
        
             
        
         
        To zoom in and out from the current model point of view, click on the 
 Zoom tool,  then 
 press the left mouse button and keep the button pressed as you move the 
 mouse cursor, the view will zoom in as you move the mouse cursor down 
 and out as you move it up.
        Tip: To centre the view on the current mouse position and start zooming, press the Z key first.
        Alternative ways to access the Zoom dynamic command are:
         
        
            - Hold <Ctrl> key and move mouse while pressing the right mouse button.
- Hold <Ctrl> key and move mouse while pressing the centre mouse button (if you have one).
- Hold the <Ctrl> + <Shift> + Z keys to start the Zoom dynamic command then hold left mouse button and move mouse.
- As mentioned above press Z to centre the view on the current mouse position and start zooming by pressing left mouse button and moving mouse.