Continuous bounce

[Kevin Camp]

for position you could use something like this:
freq = 1; //bounces per second
amp = 100; //bounce height in pixels

y = Math.sin(time*Math.PI*freq)*amp/2;
value + [0,y]

it will cause a layer to continually bounce in an elastic fashion.

if you needed a hard bounce (like a ball bouncing off the ground), you could change the third line to this:
y = Math.abs(Math.sin(time*Math.PI*freq))*amp;

for rotation, since you could use the same expression but change the last line to this
value + y

Kevin Camp
Art Director
KCPQ, KZJO & KRCW

[Kevin Camp]

also, if you want more info on expression like these, you can find more on them at motionscript.com.

these were based on the expression found here:
https://www.motionscript.com/mastering-expressions/simulation-basics-3.html

Kevin Camp
Art Director
KCPQ, KZJO & KRCW

[Kostas Bartsokas]

Hi Kevin

it worked like a charm!! Thank you very much! I’ll have a look at Motionscript.

Thanks!

[Viktor Vaughn]

Hi Kevin,

Is there any way to randomise the freq or amp to parimeters i can set?

Much appreciated