this.addEventListener(Event.ENTER_FRAME, go);
var nvar:int = 0;
function go(evt:Event):void {
nvar++;
if(nvar%3==0){
// perlinNoise stuff…
}
}

Just a simple trick to have the noise update at a lower speed than the swf’s framerate. For best results just tweak the settings for the noise so the animation still looks “flowing” at the lowest possible framerate.

Could’ve thought of this myself, but I read Julio Sancho’s blog before i did :P. I got this tip from: http://julifos.wordpress.com/2010/04/19/flash-bitmap-filters-ie-displacementmapfilter-perlinnoise-and-cpu-usage/

Thanks for this great effect!

If your bandwidth profiler is up then this would cause the problem due to the stage bounds being offset when the profiler opens and the constraints written in the code relating to the initial stage size.

I love this, very interesting using brightness to offset movement. Would be interesting to see generated art over a photograph or other piece of art. Maybe mix with music to generate over the course of a song for velocity and direction using brightness and color change. hmm…

Should try Perlin Noise function using frocessing library ( frocessing.math.PerlinNoise )
It’s a simple mathematic function that do the same , much more faster !