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Need to relate the drop shadow effect of a pre-comp to the Light layer of the main comp
I got a comopsition filled with lots of pre-comps ( imagine that a wall in 3d space is the main composition and the pre-compositions are pictures with frames – chaplets to be really clear, I think).
The pictures are hanging on that wall, and theres a light layer in the main commposition. The chaplets ( pre-comps with pictures) have a drop shadow effect (inside the pre-comp), to give a nice look, almost realistic that there’s actually a picture inside of them.How can I relate the direction of the drop shadow effect inside the pre-composition, to the Light layer in the main composition?
Thanks for reading. 🙂
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5 Replies
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If you’re using the Drop Shadow effect, something like this should work:
L = comp(“Main Comp”).layer(thisComp.name);
p1 = L.fromWorld(comp(“Main Comp”).layer(“Light 1”).toWorld([0,0,0]));
p2 = toWorld(anchorPoint);
d = p1 – p2;
radiansToDegrees(Math.atan2(d[1],d[0]))-90If you’re using the drop shadow layer style, you’ll need to change the last line to this:
-radiansToDegrees(Math.atan2(d[1],d[0]))
Dan
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neither of the expressions worked. I moved the light around but the shadow of the pre-comp did not follow it’s movement at all.
What did I do wrong (haha) ?
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The drop shadow is applied to a layer inside the precomp, correct? Or is the drop shadow applied to the precomp as a layer inside the main comp?
Dan
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it is applied to a layer inside the pre-comp, yes.
I didn’t get any code errors or anything. But the drop shadow won’t move as the “Light 1” layer moves too. -
I’m stumped. It works here. I must have something set up differently than you do…
Dan
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