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Jack-in-the-box in 3d
I’m trying trying to use the jack-in-the-box expression on a 3d layer. Problem is that the position keyframes go from a negative value to a postive value so the expression doesn’t work. Is there a work around?
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3 Replies
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Not exactly sure what you’re asking here, but if you want something that springs towards the camera in the z direction, you could try this:
veloc = 35;
amplitude = 150;
decay = 1.0;
z = amplitude*Math.cos(veloc*time)/Math.exp(decay*time);
value – [0,0,z]Dan
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Thanx Dan. But that was not what I meand. My jack went from a negative y-value (in the box) to a positive y-value (out the box). I’ve created a new box, smaller and closer to the camera. Problem sorted. But your script alteration for a z-value will come in handy in this project too. Thanx Dan!
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A sinewave by definition will allways result in an oscillation between positive and negative 1, this gets multiplied by the amplitude.
just add a value larger than the amplitude to it to keep it from dipping below 0
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