3 Replies Latest reply on Feb 4, 2010 12:37 PM by bogiesan-gyyClL

# Mathematical formula or "effect" in AE for exponential time duration decrease?

In my composition I end with a montage of stills (48 in total) that need to be viewed within ~50 seconds (basically how much time I left for the coordinated stills to music). Does anyone know of a mathematical formula or "effect" that will allow for an exponential time duration decrease, where the first still shows at X time, the second is X-Y, etc, where each subsequent still decreases in time duration?

I have played around with the time durations for the amount of time I have left and the amount of stills, but it doesn't really flow smoothly, sort of choppy... looking for something more concrete as to what each stills time value should be until it reaches the last still which should be a little more than zero. I hope this all made sense. Thanks again!!

• ###### 1. Re: Mathematical formula or "effect" in AE for exponential time duration decrease?

Set your pictures in a composition in a sequence, all the same duration. Check AE help for "Sequence Layers"

Set that composition in another composition and enable time remapping. Check the AE help for info on Time Remapping.

Then, rather than just using keyframes to adjust the time go into the graph editor and play with the motion graph. Again, use the AE help as a reference.

Playing around with it will eventually get you where you want to go.

• ###### 2. Re: Mathematical formula or "effect" in AE for exponential time duration decrease?

> I hope this all made sense. Thanks again!!<

None at all.

Look up "exponential scale" in the manual. It is a calculation you can apply to any two keyframes. You could create a sequence that has all of your stills in it and precompose it, enable time remapping, apply exponential scale to the first and last keyframe.

bogiesan

• ###### 3. Re: Mathematical formula or "effect" in AE for exponential time duration decrease?

Thanks! I will look into that!