free wiggle, rubber, bounce, throw, inertia expressions i find useful

[Dan Ebberts]

That’s pretty strange. You could try replacing the last part of the expression with this:


if (n > 0){
try{
v = velocityAtTime(key(n).time - thisComp.frameDuration/10);
value + v*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t);
}catch (err){
value
}
}else
value


That should stop the error message, but it might give you a strange glitch where the value suddenly pops back to the pre-expression value, so watch out for that.

Dan

[Layne Haacke]

with a quick test, that seemed to work.
I’ll watch for that glitch.

Thanks

[Michael Wilfong]

I’m having the same issue ONLY in CS6 too!! I haven’t found a way to fix it either. I’ll try to swap the last part as Dan mentions but I’d really like to know what’s happening here. Perhaps there is a fix in the works??

[Scott Green]

Is there an expression that will make a wire sway?

Like a skipping rope, say you’re turning the skipping rope and then stop turning, the rope will sway.

Here’s a screenshot:

I’ve animated this USB lead coming in from the left and connecting to the USB port. I used the puppet tool to make the wire look a bit more organic as it was approaching the port but I think using an expression like this could make it look really nice and natural looking.

Thanks in advance.

Creative Multimedia Design Manchester | S©tt Green | Splurj

[Chris Wright]

I don’t know exactly how you want to perceive the cord, but one way I imagined was the cord closest to the usb port was slightly stiff and the far tail was way looser. I would apply starch to the front and the tail was much more waggy using this elastic example.

https://www.motionscript.com/design-guide/elastic.html

or if you want to overshoot the keyframe
https://www.motionscript.com/articles/bounce-and-overshoot.html

[Scott Green]

The Calculation Overshoot expression worked a treat, many thanks 🙂

https://www.motionscript.com/articles/bounce-and-overshoot.html

Creative Multimedia Design Manchester | S©tt Green | Splurj