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Tracking Child Layers – 1 Dimension
I’m using the following expression track a child layer that is parented to a null:
c = thisComp.layer(“box”);
c.toWorld(thisComp.layer(“box”).transform.anchorPoint);The expression works fine, except I only want to track the X and Z values. It’s a shadow that’s following under an object as it flies into the distance – the object casting the shadow moves up and down, but I want the shadow locked in its Y position.
(The reason I’m not using a light to cast a shadow is that the ground is a stock video and not an actual 3D surface that accepts a real shadow, so I’m using an artificial shadow) -
4 Replies
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Why not have a null track that child object with that expression, then have your shadow reference the null object’s position points for the x and z?
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(The ‘Great’ stands for ‘Not So Great, in fact, Extremely Humble’)No trees were harmed in the creation of this message, but several thousand electrons were mildly inconvenienced.
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Great suggestion and a successful one at that, thanks!
It’d still be useful to know if there is a way to modify that original expression and cut out the middle man. It’d be one less layer. But in the meantime, the workaround is good for me.
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This should work:
c = thisComp.layer(“box”);
p = c.toWorld(c.transform.anchorPoint);
[p[0],value[1],p[2]]Dan
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Works perfectly, thanks so much!
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