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make a layer move away from point (expression)
Hi,
So let’s say I have a small 10×10 solid and a null object. Over time, I would like the Solid to move at a constant rate away from the null. Is this possible? I can elaborate if reqired, but basically it should almost look like a single particle moving away from the source point of a particle engine. Is that possible?
-echo
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3 Replies
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You might start with something like this:
angle = 45; // angle of travel away from null
spd = 200; // speed (pixels per second)rads = degreesToRadians(angle);
xComponent = Math.cos(rads);
yComponent = Math.sin(rads);
thisComp.layer(“Null 1”).position + [xComponent,yComponent]*spd*time;Dan
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If you wanted to create more of an explosion, you could use something like this and duplicate your layer a bunch of times:
seedRandom(index,true);
angle = random(360); // angle of travel away from null
spd = random(150,400); // speed (pixels per second)rads = degreesToRadians(angle);
xComponent = Math.cos(rads);
yComponent = Math.sin(rads);
thisComp.layer(“Null 1”).position + [xComponent,yComponent]*spd*time;Dan
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this is a really good expression that solved a problem for me. It’s in my notebook. Thanks Dan!
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