Jack in the box in Z axis only

[Eric Sanderson]

freq = 5;
amp = 125;
decay = 3;

z = amp*Math.cos(freq*time*2*Math.PI)/Math.exp(decay*time);
value + [0,0,z]

theres a few ways to do it, none any more simple than the other, heres one…and this is assuming your doing a Math.sin or .cos*Math.exp(time) expression for the spring action.

[Göran Thorén]

Hi Eric and thank´s a million for that solution!
Even if I can`t keyframe it, it will work great for my needs!

Do you have a clever suggestion for animating it to? (think of holding an object in your hand and looking down and dropping it)

[Eric Sanderson]

you shouldnt need a script if you planned on keyframing it.

So if im understanding you right you dont need so much of a “springy” action as you do just bounce or recoil from something dropping and hitting the ground?

[Göran Thorén]

What i mean is if I need to drop a lot of objects that way and have it do that springy motion when it lands.
Another thing. Is there a way to offset your expression so #1, it doesn´t start right away and #2 so the layers doesn´t move in synch?

Thank´s again!