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Having Trouble With A Parenting Situation
Hello; sorry for the slightly weird title but i have no other way to describe my issue and i need to solve it immediately.
I am trying to animate the pedals of a bike rotating, but i’m having some trouble with the parenting.
I’m trying to parent the pedal’s position to the pedal’s rotating axis (the metal tube), but if i try to do that the pedal snaps to the tube’s anchor point, which of course is not good.
The problem is rather hard to describe, so i have shot a quick video showcasing it.
How can i keep the position parenting while having the pedal in the correct position?
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thisComp.layer("Front Pedal Bar Outlines").transform.position -
6 Replies
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Why are you using an expression for position rather than actually parenting the layer? I think I would parent the layer, then add a rotation expression to keep the pedal level.
Dan
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Thanks, would you kindly explain me how to do that? I’m not really into expressions.
By the way is it possible there isn’t a quick way to parent only one propriety? Thanks.https://vimeo.com/studiomarchetti
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If the pedal is parented to the shaft, and you rotate the shaft, the expression to counter-rotate the pedal might be as simple as this:
value -parent.rotation
You might need to add an offset, depending on how you have things set up.
Dan
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It worked; thanks.
For the future, could you tell me how to lock other proprieties? Thanks.
I really need to learn expressions, but i can’t find decent courses.https://vimeo.com/studiomarchetti
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Another approach would be to create a null and parent it to the crank at the pedal’s attachment point. Then you could use this for the (unparented) pedal’s position:
thisComp.layer(“Null 1”).toComp([0,0,0])
and the pedal should stay horizontal as the crank rotates.
Dan
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