NPR GLSL Tutorials [closed]

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Anyone have a good list of tutorials on doing Non photo realistic rendering with开发者_开发技巧 GLSL ? I have seen books on GLSL, and books on NPR, but very few books/tutorials on doing NPR with GLSL. (I want to do it with GLSL as I want real time).

Thanks!

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I posted my blog article about simple toon shader effect generation on images with GLSL. Maybe you will be interested.

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I am very interested in NPR too. These are some tutorials/articles I have come across:

Tron, Volumetric Lines, and Meshless Tubes
Silhouette Extraction
Antialiased Cel Shading
Fast High-Quality Line Visibility
Two Fast Methods for High-Quality Line Visibility
Stylization of Line Drawings
Blueprint Rendering and "Sketchy Drawings"
Shader-Based Wireframe Drawing

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The wikipedia page on cel shading and celshading.com have some information.