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accessing sub-composition property
Hi, I have a wheel comp, within a layer “rim”
Now, the rim, nothing else, shall rotate to the x-position of the wheel.
So I tried to add the following script to the position-properties of the wheel-layer in wheel’s parent-composition.
720 is the circumference of the wheel in px.var r = (transform.position[0] / 720 * 360)/(180/Math.PI); // rad
thisComp.layer("wheel").layer("rim").transform.rotation = r; // I guess I can't stack layer-properties? but what then?
value + [0,0]; // If I dont do this, it causes a dimension-exceptionI haven’t figured out yet if the math is correct or if I need rotation or radiants. So far I just can’t get access to the rim-layer in the wheel-composition.
How can I do that?
Thank you, guys.
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1 Reply
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It looks like you’re trying to control rotation from a position expression. If so, that won’t work–the expression needs to be on the rotation property itself (an expression can only affect its host property, nothing else).
So your calculation would be something like:
360*(wheel’s x distance)/(wheel’s circumference)
where:
(wheel’s circumference) = (wheel’s diameter)*Math.PI
Dan
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