3D Navigation Controls and Lighting
![The Lights button in the toolbar](../qsg_shared/images/navigation_1.png)
1. Turn lights, shadows and reflections on or off.
![Different rendering quality with Lights turned on and off.](../qsg_shared/images/navigation_2.png)
Notice that the program performance may decrease when the lighting is on.
![Controls to walk in the 3D view.](../qsg_shared/images/navigation_3.png)
2. Show or hide the navigation controls 3 and 4.
3. Drag the circle in the middle towards the direction you want to walk in.
4. Drag the handle to raise or lower your point of view.