Keyboard controls:

• w, a, s, d - move forward, left, back, right
• W, A - zoom in, zoom out (change field of view)
• r, f - move up, down
• i, j, k, l - look up, turn left, look down, turn right
• O - look at origin
• I, J, K, L - orbit up, left, down, right
• SPACE - pause rotation
• y - rotate about y axis
• x - rotate about x axis
• z - rotate about z axis
• o - Reset to initial state