Stop wiggle at certain time and keep value

[Parks_]

I'm trying to create an animation whose length can be user-controlled via a slider.

It is about a layer which rotates in 3D space and it works just fine for the rotation and length controls.

But I want to give that layer also some random movement in the form of a wiggle on the position property. I figured out how to stop the wiggle at a certain point in time, but after that point it just jumps back to its initial value. But I want it to keep it the value it has on the last frame the wiggle is active.

Is there a way to do this?

[Paul Tuersley]

One way to do this is to do the wiggle on something like an Expression Controls > Point Control effect then access it using valueAtTime. Here's an example you'd put on Position where you've added a Point Control (set to 0,0) to the layer with a wiggle and a Slider Control to set the time the wiggle should stop. If you want to wiggle in 3D you could always use a 3D null to hold the initial wiggle.

holdTime = effect("Slider Control")("Slider");

wig = effect("Point Control")("Point");

if (time < holdTime) value + wig;

else value + wig.valueAtTime(holdTime);

[UQg · Accepted solution]

You can also use the time parameter of the wiggle.

Given that time is in 5th position in the arguments, you also need to specify the 3rd and 4th (octaves=1 and amp_mult=0.5 are the defaults):

holdTime = effect("Slider Control")("Slider");
wiggle(0.5, 50, octaves = 1, amp_mult = .5, t = Math.min(time, holdTime));

Xavier