wiggler

[Kevin Camp]

i’d probably try adding a slider control (effects>expression controls) and link that slider value to the second wiggle value (the amount) in your expression. the slider value can be key framed, so you can set the value to zero at a certain point in the timeline.

so after adding the slider control, your expression might look something like this:

amount=effect(“Slider Control”)(“Slider”);
wiggle(.5,amount)

then you can keyframe the slider value to go from 20 to 0 when you need it. you can also take advantage of keyframe interpolation between those values, ie. you could use ease keyframes or hold keyframes, etc, to create a different effect as the layer stops wiggling (stops slowly, stops suddenly…).

Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW

[Dan Ebberts]

This example stops after 3 seconds:

stopTime = 3;
t = Math.min(time,stopTime);
wiggle(.25,20,1,.5,t)

Dan

[Clyde Villegas]

wiggle(.25,20,1,.5,t) 

Thanks! But what do 1 and .5 in the expression mean?

ut in omnibus glorificetur Deus

[Dan Ebberts]

Those parameters are the number of octaves of noise to use and the weighting of each successive octave. I hardly ever use those parameters but you have to specify them to get at the fifth parameter, time. So in this example, I just specified the default values (1 and .5).

Dan

[Clyde Villegas]

Thanks Kevin. I had so much control with your expression.

ut in omnibus glorificetur Deus

[Clyde Villegas]

Both the position and rotation properties were animated with keyframes. I typed the expression in the position property and the animation (of the position) froze. The rotation property, however, was working and stopped after 3 seconds. What will I do so that the position will continue to animate and only stop after 3 seconds?

ut in omnibus glorificetur Deus

[Dan Ebberts]

It works for me (and stops after 3 seconds). The amplitude is only 20 pixels, so is it possible you’re just not noticing the wiggle on top of your keyframed movement?

Dan

[Clyde Villegas]

amount=effect("Slider Control")("Slider");
wiggle(.5,amount)

I have another question. What if I want to use your expression but would like to add that the wiggler only affects the x axis, or both x and y only?

ut in omnibus glorificetur Deus

[Dan Ebberts]

X only (assuming 3D):

amount=effect(“Slider Control”)(“Slider”);
w = wiggle(.5,amount);
[w[0],value[1],value[2]]

X and Y only:

amount=effect(“Slider Control”)(“Slider”);
w = wiggle(.5,amount);
[w[0],w[1],value[2]]

Dan

[Clyde Villegas]

X only (assuming 3D):

amount=effect("Slider Control")("Slider");
w = wiggle(.5,amount);
[w[0],value[1],value[2]]

X and Y only:

amount=effect("Slider Control")("Slider");
w = wiggle(.5,amount);
[w[0],w[1],value[2]] 

Thanks Dan. I’ll try those.

Clyde

ut in omnibus glorificetur Deus