* if we are far, go in the center direction,
* if we are at radius, we want to see the center at 90°
* if we are nearer than radius, angle to center is > 90° */
* if we are far, go in the center direction,
* if we are at radius, we want to see the center at 90°
* if we are nearer than radius, angle to center is > 90° */