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Scale affected by speed.
Hi!
Is there a way to read the speed value of an animated layer and let it affect the scale an a second layer? So the faster the Layer A goes, the bigger Layer B gets.
Thanks!
/Joan -
7 Replies
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Assuming the speed of the object is controlled by it’s position or anchorpoint transformation use the pickwhip to call this value to the other layers scale property. The pickwhip is the little swirly button that appears when you open the expression editor of a property. Click and drag it to the position or anchorpoint value of the “speed” layer and then turn it into a variable, then call the way you want the speed to affect the scale. For example, if the object were to go from the left to right side of the comp you could make the scale of the object increase and decrease from 0 to 100 in a loop like this:
x = thisComp.layer(“speed”).transform.position;
Math.abs(Math.sin(x)*100) -
You could do it like this:
scaleFactor = 100;
s = thisComp.layer(“Layer A”).transform.position.speed;
value*(s/scaleFactor)You would increase the scaleFactor to reduce the effect.
Dan
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Hey, whats that little bit there at the end?
.speed
how does that work?
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The position property has speed and velocity attributes. speed is just the magnitude, velocity is a vector that indicates the current direction as well as the magnitude.
Dan
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Okay, so it goes by the factor of After Effect’s time, uses pixels as units of measurement?
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Yes, pixels per second.
Dan
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Hey!
Thanks guys! That .speed value was exactly what I was looking for. Worked perfectly!
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