Start/Stop Time Expression

[federico_montemurro]

Hi,

I'm new to expressions and I need to start and stop the expression at specific frames.

My expression as follows:

f = effect("Frequency")(1);

p = effect("Period")(1);

Math.cos(p * textIndex/textTotal + time*f)*50

Thanks in advance for all your help!

[Dan Ebberts · Accepted solution]

I'm not sure if this is what you're after, but this expression will run from frame 10 to fame 30--outside that range, it will be like the expression isn't there:

fStart = 10;

fStop = 30;

if (time >= framesToTime(fStart) && time < framesToTime(fStop)){

  f = effect("Frequency")(1);

  p = effect("Period")(1);

  Math.cos(p * textIndex/textTotal + time*f)*50;

}else

  value

Dan

[federico_montemurro]

Thanks so much Dan of the prompt reply!

Do you know how can I slow down the wavy effect from my expression all the way to zero? I know I'm abusing at this point!

Thanks again.

Federico

[Dan Ebberts]

It's not simple:

http://www.motionscript.com/articles/speed-control.html

Dan

[federico_montemurro]

Thanks for the link Dan. I'll get into it.

F

[federico_montemurro]

Hey Dan,

I found a solution using Slider Controls on my expression and it worked just fine.

Thanks again!