I have an animation of a ball rolling on an arbitrary surface. I'm using the
normal force on the ball to induce an acceleration and create movement.
That works great, the problem come when I try and make the ball "roll"
realistically. The problem is that the axis that the ball needs to rotate
around is constantly changing.

In effect I have a new rotation step added every frame around an arbitrary
axis. Does anyone have an idea of how to store an rotational "state" for my
ball that I can call during the next frame and add to?

Any help would be great.

-Phil

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