Left-click into the scene, then steer with the mouse.
Click again to recover the system cursor.
Press the up arrow key ( ↑ ) to go faster
or the down arrow key ( ↓ ) to go slower.
Press the spacebar to stop.
If you have a trackpad, you may drag two fingers across
the trackpad to control your speed (if the trackpad supports scrolling).
If you have a mouse with a wheel, you may roll the wheel
to control your speed. With an Apple mouse, press lightly
on the little scroll ball as you roll it forwards and backwards.
With a PC mouse, just roll the wheel without pressing down.
Press the spacebar to stop, left-click into the scene,
then drag the mouse with
no keys down
Control key down
Shift key down
both Shift and Control keys down
to experiment with full six-degrees-of-freedom motion.