need expression for up and down position

[yia]

hi,

does anybody know to set an expression for the position where the footage only come so far down or go so far up

I want the position of the footage only come down to 290 and only goes up to 140


thanks

[drk3p]

Why cant you just use 2 keyframes?

[yia]

Never ever thought of that............thanks

[yia]

keyframe won't work..........

[CaptainMench]

Not sure what you really want...

but if you want footage to 'drop' in and bounce...

Set a keyframe at the top, then at the bottom and apply this to the position:

veloc = 35;
amplitude = 30;
decay = 1.0;
y = amplitude*Math.cos(veloc*time)/Math.exp(decay*time);
value + [0,y]

Thank dan ebberts.

CaptM

[milksac]

If you're trying to wiggle an object in that range you could use this expression and adjust the anchor point to position the animation.

w = wiggle (1, 150);
[value[1],w[0]]

Yes, Dan Ebberts is the guru on expressions.
The CreativeCow has an expressions forum that may be helpful.

http://forums.creativecow.net/adobe_after_effects_expressions

I'm just starting to mess around with expressions now. If I ever knew that math could be this much fun I would have paid more attention in class.

[yia]

ok.... I'm try to create a widescreen preset like the one in fcp where you can adjust the position of the footage