[Dan Ebberts]

You probably want the Strobe Light effect with the “Make Layers Transparent” option.

Dan

[Dan Ebberts]

You probably want the Strobe Light effect with the “Make Layers Transparent” option.

Dan

[Dan Ebberts]

It would be fairly easy with a script. You can’t do it with just an expression though.

Dan

[Dan Ebberts]

It would be fairly easy with a script. You can’t do it with just an expression though.

Dan

[Dan Ebberts]

I’m not sure what you mean by decay. Do you want the lines to slow down and stop at random positions, return to their original positions, or something else entirely?

Dan

[Dan Ebberts]

A slider, as suggested would work, or you could code it right into your expression:

amt = linear(time,28,30,12,0);
wiggle(3,amt);

Dan

[Dan Ebberts]

A slider, as suggested would work, or you could code it right into your expression:

amt = linear(time,28,30,12,0);
wiggle(3,amt);

Dan

[Dan Ebberts]

I think the nature of AE and expressions makes system time unusable if you think about it. If you were using it as random seed, that number would be changing even while you’re just sitting on the same frame. With the way expressions work, there’s no way to just seed the random number generator once and have that affect the entire comp. And there’s no way to pass the seed from one frame to the next. I’m guessing it wasn’t an oversight to leave it out, because it just wouldn’t work the way you would want it to.

Dan

[Dan Ebberts]

I think the nature of AE and expressions makes system time unusable if you think about it. If you were using it as random seed, that number would be changing even while you’re just sitting on the same frame. With the way expressions work, there’s no way to just seed the random number generator once and have that affect the entire comp. And there’s no way to pass the seed from one frame to the next. I’m guessing it wasn’t an oversight to leave it out, because it just wouldn’t work the way you would want it to.

Dan

[Dan Ebberts]

If you do it this way, you’ll end up with a rotation expression that looks something like this:

amp = 30;
stride = 50;
dist = position[0] – position.valueAtTime(0)[0];
cycles = dist/stride;
value + amp*Math.sin(cycles*Math.PI*2)

With possibly an initial phase offset to put the leg in the correct position at time = 0.

Dan