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Sphere/ball control
I tried setting up a control for a sphere/ ball (or 2 discs intersecting, perpendicular on eachother) in AE 3d space using Nulls and basic expressions. The idea was to animate in one Null the x and z position and have the ball rotation linked to the position. The problem I ran into was that once the movement started on one direction it changed the axis for the rotation on the other direction, the ball ending up rotating in opposite direction than in the beginning. I figured I need an expression that will compensate for the rotation on the other axis, but I am not sure how to do this.
I am posting below a link to the latest version of my project.
2161_spherecontrols2.aep.zipTudor “Ted” Jelescu
Senior VFX Artist -
2 Replies
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I was hoping at least that someone will try this…
Tudor “Ted” Jelescu
Senior VFX Artist -
I think the basic problem is that you’re trying to calculate rotation based on x-z position. For any given position, there are an infinite number of paths you could use to roll there. So the ball could have any orientation at any given position in the x-y plane. So I don’t think there’s any way to just calculate the orientation. You’d have to examine, frame by frame, the motion that got you to the current location, accumulating the incremental rotation as you go, which could get very complicated.
Dan
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