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Making shape layer rotate to follow a null’s position
Hi
I need to use and expression to create an animation of a magnetic field attraction. So i have a series of small rectangle shape layers and would like them to follow a null around the screen always pointing at it.
I want the rectangles to rotate on there own anchor point towards the null.
I figured it would be something equivalent to a point of interest that i could attach to the null and therefore create the attraction.
Like this magnet style:
If I could have a couple of pointers that would be great.
Thanks,
Tom -
2 Replies
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Have a ‘look at’:
https://forums.creativecow.net/thread/227/10502 -
Thanks Frank for that but it doesnt quite fit my needs.
This is my base equation:
Line = length(toWorld(anchorPoint), thisComp.layer(“Null 1”).transform.position);
delta = toWorld(anchorPoint) – thisComp.layer(“Null 1”).toWorld([0,0,0]);
radiansToDegrees(Math.atan2(delta[0],-delta[1]))But i need it to react so that the further away it is from the X and Y axis the more accurate the direction of line is. And vice versa.
So i extended it to this:
YNull = length(toWorld(anchorPoint), thisComp.layer(“Null 1”).transform.yPosition);
XNull = length(toWorld(anchorPoint), thisComp.layer(“Null 1”).transform.xPosition);
Line = length(toWorld(anchorPoint), thisComp.layer(“Null 1”).transform.position);
delta = toWorld(anchorPoint) – thisComp.layer(“Null 1”).toWorld([0,0,0]);
radiansToDegrees(Math.atan2(delta[0],-delta[1]))*(Math.atan2(ease(YNull,740,850,3,1), ease(XNull,390,500,3,1)))But now it will not follow my Null layer correctly. I will attach a picture below of both expressions results.
You may notice a grey opacity and that is where the lines should be to fit the design.
BASE EXPRESSION:
EXTENDED:
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