• Adobe After Effects Expressions

  Noise() help

  Posted by Womble on July 25, 2006 at 1:22 pm

  Hey all, just followed dan ebberts tutorial on using hte noise() function. Was wondering if somebody could go through and comment the code for me so i can better understand how it works. I have a good understanding of programming, just not the commands used in AFX!

  cheers.

  numRows = 10;
  numCols = 10;
  xyCompress = 200;
  speedCompress = 1;
  amplitude = 100;

  row = Math.floor((index – 1)/numCols);
  col = (index – 1)%numCols;
  x = col*width + width/2;
  y = row*height + height/2;
  xOffset = (this_comp.width – numCols*width)/2;
  yOffset = (this_comp.height – numRows*height)/2;

  z = amplitude*noise([x/xyCompress,y/xyCompress,time/speedCompress]);

  [x,y,z] + [xOffset,yOffset,0]

  Womble replied 20 years, 2 months ago 3 Members · 3 Replies
• 3 Replies

• 

  Filip Vandueren

  July 25, 2006 at 11:06 pm

  Think of noise() as a field of values waiting to be mined:
  you feed it a value, or a position (2d or 3d), and it gives you a pseudo-random number.

  The field never changes: you’ll always get the same values from the same co
• 

  Dan Ebberts

  July 26, 2006 at 12:13 am

  Thanks Filip, I couldn’t have explained it better myself. 🙂

  Dan
• 

  Womble

  July 27, 2006 at 1:12 pm

  cheers dude i got a better idea of whats going on now, i shall re read and digest some more!!!

  cheers

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