What is the “t=time” value in wiggle expression?

[Dan Ebberts]

It just specifies the time that the wiggle value is retrieved from. Works kind of like valueAtTime().

For fun, apply this expression to a small solid’s position and then duplicate the solid a bunch of times:

delay = 0.1;
seedRandom(1,true);
wiggle(1,200,1,0.5, time – (index-1)*delay)

Dan

[Lord Scales]

I got it!

Thanks, Dan!

By the way, the effect is really funny 🙂

Lord Scales

[Scott Green]

Hi, I’m trying to delay a wiggle along the Y axis that doesn’t start until 100 frame into the animation, can you help?

I tried:

delay = 100; b = wiggle(5,5);[value[0], b[1]]

But I’m a bit of a noob when it comes to expressions 🙂

Thanks

Creative Multimedia Design Manchester | S©tt Green | Splurj

[Scott Green]

Also, can you also specify a time for the wiggle to stop wiggling?

Creative Multimedia Design Manchester | S©tt Green | Splurj

[Dan Ebberts]

This is one way to do it. This expression starts wiggling at frame 100 and stops at frame 200, with a 5-frame ramp on each end:


fStart = 100;
fStop = 200;
fRamp = 5;

amp = 5;
freq = 5;

tStart = framesToTime(fStart);
tStop = framesToTime(fStop);
tRamp = framesToTime(fRamp);
if (time < (tStart + tStop)/2)
a = linear(time,tStart,tStart+tRamp,0,amp)
else
a = linear(time,tStop-tRamp,tStop,amp,0);
wiggle(freq,a)


Dan

[Scott Green]

That’s amazing thanks, but how do I make it only wiggle on the Y axis and not the X?

Creative Multimedia Design Manchester | S©tt Green | Splurj

[Scott Green]

I’m alos wondering, is it possible to make an expression start and stop at key points, say ‘start at 100 frames, stop at 200, start again at 300, stop at 400’ for example?

Thanks.

Creative Multimedia Design Manchester | S©tt Green | Splurj

[Dan Ebberts]

In general, yes–although the way you do it might depend on the expression. Basically you need to first calculate the total “run time” up through the current frame and plug that total into your expression where you would normally use time.

Dan

[Joe Nicklo]

This was a huge help for something I’m working on. Thanks!