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Expression to simulate a pixie flapping it’s wings
I have two wings that are on two separate layers – both under the person.
I have 3D turned on and want to get an expression that flaps them at near humming-bird speed.
I’m playing with wiggling the Y rotation of each wing without much luck. Nothing looks fast enough or real enough.
Does anyone have an expression they can share? Thanks!
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3 Replies
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This may work for you, just add it to the rotation axis that you want the wings to rotate on.
upRot = 45 ;
dwnRot = -45 ;
freq = 10 ; // times per sec
ease( Math.cos( time * 2 * Math.PI * freq ), -1, 1, upRot, dwnRot )The upRot and dwnRot values are essentially the min and max rotations for the wings (set as needed). Then adjust the freq of the flapping — according to the internet, a humming bird beats it’s wings between 10 and 80 time a second.
If you wanted to add some randomness, you can literally add some wiggle() to the end of the last line:
ease( Math.cos( time * 2 * Math.PI * freq ), -1, 1, upRot, dwnRot ) + wiggle( 5, 10 )
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Actually, to make the upRot the maximum upwards angle, I should have use the sine function… the last line should be like this:
ease( Math.sin( time * 2 * Math.PI * freq ), -1, 1, upRot, dwnRot )
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Thank you SO much! 🙂
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