How to navigate a Sagan (rotate, move forward and backward):
The WASD keys (or the ARROW keys) on your keyboard are your "feet." They will move you forward, back, left, and right. Hold the RIGHT MOUSE BUTTON down and move your mouse to "look around" the Sagan. You can do both actions at the same time for a natural movement experience.
Double-click anywhere on the floor of a Sagan to "jump" to that location.
If you're using a trackpad, hold CTRL/CMD and swipe to look around. Left click to stop looking around.