We implemented the virtual trackball by comparing the current position to the initial position…

We implemented the virtual trackball by comparing the current position to the initial position and computing a rotation based on that difference. We could instead have implemented an incremental version, in which each cursor motion is interpreted as representing a separate tiny rotation from the prior cursor position to the current one, and these tiny rotations are accumulated. Implement this, and click on the frontmost point of the interaction sphere, then drag a small circle around that frontmost point, and finish by returning to the frontmost point. Does the cube return to its initial position? Do you personally prefer the differential or the integral version of this interaction?

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