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How to use tracker data on a 3D layer?
Hi folks,
I was just tracking some video with me sitting in a chair and waving around with my finger. The tracking went well and now I got a handsome null-object following my fingertip.
I then tried to apply the tracker data to another layer on which a nice butterfly resides. My goal: let the butterfly sit on my fingertip while I’m waving around. The problem now is, the butterfly layer is a 3D layer and its z-position in by 8000. Because of that the x and y movement doesn’t follow my fingertip anymore because its scaled down according to the perspective.
I figured out, there is an expression to project a 3D movement to composition coordinates: toComp(). But I need it some kind of the other way. Is there any possibility to match my 2D tracking data to a 3D layer deep down in 3D space so that it will still follow the tracked object? Like it would as it had a z-position of 0? The position of 8000 ist nesscesary because of the proportions of the butterfly.
Thank you very much in advance, I’ve been working on this the whole day long now!
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3 Replies
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This is a tricky one. Try this:
L = thisComp.layer(“Null 1”);
fromCompToSurface(L.toComp(L.anchorPoint)) + value – anchorPoint;Dan
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This is better:
L = thisComp.layer(“Null 1”);
toWorld(fromCompToSurface(L.toComp(L.anchorPoint)))Dan
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WOW! This is incredible! This is awesome! It works just like I wanted it to! Thank you so much.
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