FORUMS: list search recent posts

Time Remapping - Unique Random playback

COW Forums : Adobe After Effects Expressions

<< PREVIOUS   •   FAQ   •   VIEW ALL   •   PRINT   •   NEXT >>
tyler jordan
Time Remapping - Unique Random playback
on May 4, 2012 at 4:32:57 am

Hi there,

I have a comp with time-remapping enabled, and a script to change the way the playhead scrubs, so that it will play one second from a random location in the comp and then move to another random location.

What I would like to do is make it play the random location only once, so that I essentially have a movie clip the same length as the comp, and all of the content from that comp, expcept mixed up into a random order.

Here is the random code I'm currently using as a starting point:
segDur = 1;// duration of each "segment" of random time
minVal = inPoint;
maxVal = outPoint - segDur;

seed = Math.floor(time/segDur);
segStart = seed*segDur;
startVal = random(minVal,maxVal);
endVal = startVal + segDur;
linear(time,segStart,segStart + segDur, startVal, endVal);

In other coding languages i've done similar things using an array and checking the scrubber against the times in the array, but i'm not sure how to do that in expressions, and also i think there is probably a more efficient way to do it.

Any help is greatly appreiated, cheers!

Return to posts index

Dan Ebberts
Re: Time Remapping - Unique Random playback
on May 4, 2012 at 8:33:51 am

This should let you divide the clip into n equal-length segments and play each segment once, in random order.

n = 10; // divide clip into 10 segments
segDur = (outPoint - inPoint)/n;
segs = [];
for (i = 0; i < n; i++) segs[i] = i;
for (i = 0; i < n; i++){
idx = i + Math.floor(random(segs.length - i));
temp = segs[i];
segs[i] = segs[idx];
segs[idx] = temp;
curSeg = Math.max(Math.min(Math.floor((time - inPoint)/segDur),n-1),0);
t = (time - inPoint)%segDur;
segs[curSeg]*segDur + t


Return to posts index

tyler jordan
Re: Time Remapping - Unique Random playback
on May 6, 2012 at 7:48:01 pm

Thanks Dan, that worked perfectly.

You probably recognised the original code, it's from your motionscript site - lots of great resources on that site!


Return to posts index

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
© 2018 All Rights Reserved