Double click to move the rotation centre and reset the zoom position.
This should be done if rotation movements become very large
and/or zoom unresponsive
-Arrow keys to pan.
-Left mouse button to rotate.
-Mouse wheel to zoom.
Press 'a', 's' or 'd' while moving the mouse to rotate, zoom and pan.
Press spacebar to reset the viewing position.
Use the Quality slider to reduce amount of loaded data
if performance is an issue.
Note. You need a modern browser that supports WebGL for this
to run the way it is intended. For example an updated version of
or IE 11.