Wiggle expression

[Ridley Walker]

Since wiggle takes a minimum of 2 parameters which represent frequency and amount, you can use an expression slider to keyframe either of these values to 0 thereby stopping the wiggle eg: wiggle(5,10) then wiggle(0,10)

An expression can also reference Composition time in seconds and start or stop the wiggle that way.

Additionally you can use markers to trigger expressions:

if (marker.numKeys > 0){
n = marker.nearestKey(time).index;
pos = [value[0],value[1]];
if (n == 2) {
pos;
}else{
wiggle(2,40);
}
}

Here are 2 methods in this sample file:

6740_stopwiggle.aep.zip

[Scott Gaskin]

Thanks for the message Ridley.

You’ll have to forgive me as I am very new to expressions so bit confused.
You talk about an expression slider, is this the slider control in after effects? If so how do you control the expression with it?

Are there any tutorials you know of that shows you how to do this you could point me to? Really appreciate you sending the example file but I couldnt open them with my version of AE (CS5) so i guess you have a newer version

Many thanks

Scott

[Ridley Walker]

Here is a CS5 version:

6748_stopwigglecs5.aep.zip

In the Composition named “Wiggle with Slider” , there are Expression sliders wired into the wiggle expression for the position of the layer.

For information on expressions go to motionscript.com, Dan Ebberts’ site which is a terrific source of information for beginners. You may also want to learn the basics of JavaScript, look to CodeAcademy for free tutorials.

[Scott Gaskin]

Many thanks for your help with this Ridley and for supplying the CS5 file. I will have a look and check out the site you mentioned. Much appreciated

Scott