Chris and Trish Meyer have a new-ish tutorial on techniques for using the After Effects filter Fractal Noise to create seamless background textures. An earlier video by Aharon Rabinowitz of Creative Cow showed how to create seamlessly looping fractal background animations by using AE's Fractal Noise.As a base to launch your own ideas Chris Zwar clearly explains how the filter really works in Fractal Noise - A New Look at an Old Friend on Creative Cow.
AE LiveDocs has more info and links to other techniques.
Update: info on noise can also be found in the Physics section of Trapcode Form's help and in Perlin Noise.
Update: info on noise can also be found in the Physics section of Trapcode Form's help and in Perlin Noise.
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