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Determining Parent Layer Control
Hello,
I have a Camera Layer which is parented to a Null layer which contains rotation and position keys. Is there a way that I could make the Null layer affect the Camera layer, in the same timing, but a little less magnitude ? (for example to move half the way the null layer moves)
Thanks, Y.
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9 Replies
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Here’s an example for position. First you need to specify a point of reference (in this case I used the parent layer’s positon at time zero).
ref = parent.transform.position.valueAtTime(0);
delta = parent.transform.position – ref;
factor = .333; // move one third as far as parent (max value = 1.0)value – delta*(1-factor)
Dan
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I guess I should remove the parenting from the camera first if I want the expression to work?
Cause with the parenting on it stays as before.
How should I reference the ‘motion’ layer once I remove the parenting ?Thanks, Y.
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No, the expression assumes the layer has a parent. You need to create keyframes moving the parent around before the expression has any effect.
Dan
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The parent layer indeed has keys in it, and so the camera layer moves, but always in the same motion as the parent layer, even though I entered that expression and modified the factor value to values between 1 and 0.001 – the motion is always constant..
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I don’t have a clue. It works for me.
You have the camera parented directly to the null, the null moves via position keyframes, and the camera motion is unaffected by expression, is that correct?
Dan
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That’s correct, I have the camera parented to the Null, and it moves according to the Null layer’s movement, regardless of the value I put in ‘factor’.
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Sorry, I don’t have a clue.
Dan
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Okay, thanks, I will try again to get your example to work.
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Hi Dan
I have used this expression successfully for the position, but i can’t get it to work for Rotation. Was it intended for Rotation aswell or does that require a different expression ?
Thanks!
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