How to create a simple bobbing up and down motion expression?

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Hi, I have a 3D object that I want to continuously bob up and down but I'm having trouble finding an expression to do this.

I would use wiggle on the Z except wiggle creates random motion and I need consistant up and down oscillations.

It seems simple but I can't figure it out... any ideas? Thanks.

-Pete

artichoked

Inspiring

If you get an error, try adding curly brackets to the if/else statement:

if (t < StartTime) {value;} else {(value + [x,0,0])}

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R

RAMQUE

Participant

HOW CAN I STOP THIS?

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R

Rick Gerard

Community Expert

Stop or start the effect by controlling amp and freq with sliders then animate the sliders.

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S

sy4za

Participant

Hi all,

The expression worked great. But i have no idea on if it is possible to decelerate the "bobbing/bopping" motion.

Do i need to adjust the value or frequency?

Thanks guys! x

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Manoel Flesch

Participant

Hey guys, sorry to revive this but the expression is really great. I'm trying to use it for the z-axis and so far it worked the only thing I'm stuck with is how to create only positive values for the amplitude. Any idea on how to do this?

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ericsten

Inspiring

Sorry for the late response.

One way to achieve this is by adding Math.abs() to your expression which will return the absolute values instead of true values (aka negative numbers get switched to positive).

Z=Math.abs(amp*Math.sin(time*freq*Math.PI*2));

- Eric

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