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Inverse Motion

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Chris Heuer
Inverse Motion
on Jan 9, 2008 at 2:04:48 pm

Hello! I am making a butterfly in AE. It's very simple, 2 wings promoted to 3D. I have moved the anchor points for each wing to the inside edge (where the body would be).

I want to write an expression so I can animate one wing (y-rotation property) and the other wing will inversely match.

I checked out some of the IK posts and the IK lesson on Dan's site but I think (hope) that's more complex than what I need here.

I think I can pick whip one wing's y-rotation to the other, I just don't know how to alter the expression to invert the second wing's motion.

Any help would be great. Thanks, Chris

Chris Heuer
Freefall FX, LLC


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Dan Ebberts
Re: Inverse Motion
on Jan 9, 2008 at 3:20:45 pm

Depending on how you set it up, it could be as simple as just adding a minus sign in front of the pickwhip-generated expression.

Dan


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Chris Heuer
Re: Inverse Motion
on Jan 10, 2008 at 1:25:07 am

That's sort of what I thought but I put the minus in the wrong place and disabled the expression! I'm such a math wiz!

Thanks, Chris

Chris Heuer
Freefall FX, LLC


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Filip Vandueren
Re: Inverse Motion
on Jan 12, 2008 at 3:24:22 am

you can also add *(-1) if that makes more sense...


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