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CC Particle World varied width streak
I am creating a 3D line that writes on using CC Particle World with expressions tying the position of the producer to a null object with a wiggle expression. I am trying to make the size of the particles get larger when the null object slows down and make them smaller when it speeds up, creating a line that varies in width as if it was drawn with an ink pen or something. I’ve tried using “.speed” but it has only given me the opposite effect. Here is what my code on the “Birth Size” property looks like:
scaleFactor = 20;
s = thisComp.layer(“Particle position”).transform.position.speed;
value*(s/scaleFactor)I also would like to be able to set a maximum and minimum so that it doesn’t get too thin or too thick.
Can anyone help me out with this?
Nate
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3 Replies
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I’d do something like this:
minSpeed = 0;
maxSpeed = 250;
minSize = .1;
maxSize = 1.0;s = thisComp.layer(“Particle position”).transform.position.speed;
linear(s,minSpeed,maxSpeed,maxSize,minSize)Just tweak the parameters to get the result you’re after.
Dan
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Thanks for the reply, Dan. I tried this out and it works to a certain extent. I tweaked the numbers a bit (see below) but haven’t gotten the results I wanted. When the null changes direction it inevitably comes to a stop here and there, which also causes a blob to form at that spot. I can get rid of the blob by adjusting the numbers, but then there is no effect on the rest of the line. Is there a way to fix this? Maybe a different method of controlling the birth size besides the speed?
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Here is the edited code that I tried to put in the previous post:
minSpeed = 0;
maxSpeed = 400;
minSize = .02;
maxSize = .4;s = thisComp.layer("Particle position").transform.position.speed;
linear(s,minSpeed,maxSpeed,maxSize,minSize)
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