accumulation

[Dan Ebberts]

Your question is pretty vague. What are you trying to do exactly?

Dan

[Adrian Germain]

Ok. I have 3 keyframes with a loop expression . The value goes from 0(key1) to 100(key2) and it holds till the third keyframe.
what i want is to add this value to position of the null. i mean, each time the loop is beginning it adds the value to the position value at that moment(valueAtTime).So finnaly i will have 0-100, hold, 100-200, hold…and so on.I know expressions don’t have memory so that’s why i think it’s about accumulation.
I was playing with this expression but it is adding each frame value to the previous one so when i have the hold keyframe it will add 100 on each frame.

Hope this time i was more clear.
Thanks.

accum = 0;
f = Math.round(time/thisComp.frameDuration);
for (i = 0; i <= f; i++){
t = i*thisComp.frameDuration;
accum += slider efect.valueAtTime(t);
}


[Dan Ebberts]

Try this:

x = effect(“Slider Control”)(“Slider”).loopOut(“offset”);
value + [x,0]

Dan

[Adrian Germain]

Thanks Dan, this is what i was looking for.
I found later that you have post a very useful tutorial about Loop Expressions.