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NPR GLSL Tutorials

Does anyone have a good list of tutorials on how to render without a photo with GLSL? I've seen books on GLSL and books on NPR, but very few books / tutorials on doing NPR with GLSL. (I want to do this with GLSL as I want in real time).

Thanks!

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I have posted my blog post about creating a simple image tone shader generator using GLSL. Maybe you will be interested.



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I am also very interested in NPR. These are some tutorials / articles I came across:



Throne, volumetric lines and unthreaded pipes
Silhouette Extraction
Smoothing Cel Shading
Fast High-Quality Line Visibility
Two Fast Methods for High-Quality Line Visibility
Line Drawing
Styling Drawing Detailing and Sketching Drawings Wireframe Drawing
Based on Shaders

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the wikipedia page on cel shading and celshading.com have some info.

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