BALLView Raytracing Demo 1

> ### Changing the Camera Position

> To set the lights as well as to find a proper camera position for the picture, an efficient handling of the camera is needed.
> The camera's position can be changed by clicking with a mouse button into the 3D graphics view and dragging the mouse:
> - Left button: Rotate
> - Middle or Wheel: Zoom
> - Right button: Move view
> - Left and Right button: Rotate in the screen plane
> Try to zoom very close to the peptide, then very far away, and compare the brightness of the scene of both camera positions.
> A roughly sensible camera position can be found by centering the camera on the entire peptide:
> Find the widget with the name Structures and highlight the System by clicking on its name ("ARND").
> Then, press the right mouse button to open a context menu and press on the Focus entry.
> Press Next to continue.