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A Cellular Texture Basis Function
An excellent introduction to cellular textures by Worley himself.
An Introduction to Fractals
Great Stuff. It starts by talking about the fractal dimension, and then it covers some classics like Mandelbrot and Julia sets. It goes on to fractal Brownian motion, and presents some terrain generation algorithms.
Fractal Explorer: Mandelbrot and Julia Stes
The details of how to draw both sets explained in a clear language. Excellent stuff. Very nice pictures.
The slides based on a talk presented on Games Developers Conference by Perlin. Must check it out!
Simulation of Plants
A general introduction to L-Systems. It provides the basic concepts and shows some interesting examples of what can be achieved with simple L-Systems.
Fast Computation of Terrain Shadow Maps
A tutorial on the lighting and shadowing aspects of terrain rendering. It presents a simple and elegant solution for terrain self shadowing.
Terrain Generation Tutorial
Playing around with the circles algorithm, presented in Lighthouse3D terrain tutorial, Bob Nystrom has come up with very interesting variations including valleys and islands. All packed in a cleanly presented tutorial.