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Parenting position of null object to position of another layer
I’ve come across a little confounding problem in my project. I have a null object (Layer 2) that is parented to a layer containing some tracking data (Layer 3). On layer 1, I want to add an adjustment layer containing an effect (a re-light). But when I parent the entire adjustment layer to the null object, the effect’s position isn’t changed. So I thought maybe I needed to parent the adjustment layer’s position directly to the null object. In this case, the re-light now matches the position exactly of the null object…which isn’t quite what I want either. Because now my re-light is “moved” to be EXACTLY where the null object position is (e.g., if my relight is in the middle of the frame, and the null’s position tracks data from a corner of the frame, my re-light effect is now moved to the corner of the frame too, and then follows the tracking data from there–whereas I just wanted the re-light to use the tracking data, but retain its original anchor position.
How can I parent this re-light/adjustment layer to the null object’s tracking data without moving the entire effect from the desired original position?
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2 Replies
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It sounds like you’re trying to accomplish what I demonstrated in my last two tutorials: Tracking a Child in After Effects.
To track the position of a child layer (layer 2), use this expression on the layer you want to effect (the effect position on Layer 1).
L = thisComp.layer(”child_layer”);
P = L.toWorld(L.anchorPoint);where P[0] gives x, P[1] gives y, and P[2] gives z.
Carl Larsen
TelescopeMediaGroup.net
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How would I go about setting this up so that there is a delay ie. the co-ordinates returned are from n second earlier?
Thanks in advance.
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