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Sine wave on effect parameter?
Hi there,
On a tight deadline and looking to put an expression on an effect parameter (specifically the turbulent displacement’s evolution).
I’m looking to have numbers bounce back and forth from 360 to -360 over a couple seconds, indefinitely. I’ve been playing around with Math.sine() but can’t seem to figure it out.
Any help is much appreciated! Thank you!
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4 Replies
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Btw, I ended up just using some keyframes and a loop expression but would still like to know if this is possible. Thx!
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Patrick
You can use a Random Expression with a Slider Control attach to it.
See the example :
5339_usingrandomwithslider.zip
Vishesh Arora
3D and Motion Graphics Artist
Films RajendraBlog:
https://digieffects.wordpress.com2011 3D Demo Reel:
https://www.youtube.com/watch?v=lHPgIJU_BR8 -
Hi,
The best resource for AE expressions is probably Dan Ebberts site:
https://www.motionscript.com/You find lots of useful info there. Or there’s a similar thread here on the Cow that looks useful:
https://forums.creativecow.net/thread/227/13225Matthew Keane
Freelancer based in Paris, France
– Motion Graphics, Video Editing & Effects, Watchout Programming & Live Operation. -
amplitude = 360;
period = 2;
refTime = inPoint;amplitude * Math.sin(2*Math.PI*(time-refTime)/period);
amplitude is the amplitude of oscillations, period is the duration of a cycle (in seconds), refTime is the time (in seconds) at which you want the oscillation to have 0 amplitude. Change these numbers according to your needs.
Don’t enter a period of 0, this will generate an error.
Note : the best suited forum for this kind of questions is the After Effects expressions forum…
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