• Adobe After Effects Expressions

  Ebberts Random Motion flip position

  Posted by Jason Jantzen on November 10, 2015 at 2:02 am

  I can’t for the life of me figure out how to flip the random motion from X position to Y position motion. Anybody know how this works?

  Here’s the code from Dan’s site
  segMin = .3; //minimum segment duration
segMax = .7; //maximum segment duration
minVal = 0;
maxVal = thisComp.width;

  end = 0;
j = 0;
while ( time >= end){
j += 1;
seedRandom(j,true);
start = end;
end += random(segMin,segMax);
}
endVal = random(minVal,maxVal);
seedRandom(j-1,true);
dummy=random(); //this is a throw-away value
startVal = random(minVal,maxVal);
y = position[1];
ease(time,start,end,[startVal,y],[endVal,y])

  Jason Jantzen
  vimeo.com/jasonj

  Jason Jantzen replied 10 years, 6 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Dan Ebberts

  November 10, 2015 at 4:37 am

  This should switch it to y:

  
segMin = .3; //minimum segment duration
segMax = .7; //maximum segment duration
minVal = 0;
maxVal = thisComp.height;

  end = 0;
j = 0;
while ( time >= end){
j += 1;
seedRandom(j,true);
start = end;
end += random(segMin,segMax);
}
endVal = random(minVal,maxVal);
seedRandom(j-1,true);
dummy=random(); //this is a throw-away value
startVal = random(minVal,maxVal);
x = position[0];
ease(time,start,end,[x,startVal],[x,endVal])


  Dan
• 

  Jason Jantzen

  November 10, 2015 at 4:41 pm

  Aha! I see now. It’s just the last two lines that change. I didn’t think about the ease expression values.

  Thanks Dan!

  Jason Jantzen
  vimeo.com/jasonj

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