Shader programming with ShaderLab and CG in unity

I am trying to learn shader programming using ShaderLab and CG at UNITY . Is there a FREE step by step guide (video / book / tutorial)?

Please do not recommend the NVIDIA CG tutorials to me (it is extremely descriptive and difficult to understand) and the only official site (there is no description only of the code)

I have been searching and studying a form of shader programming for the last 3 days until I found any good resource . It is my observation / perception that it is difficult to learn although I have some experience and a good understanding of C # and Javascript programming, but have a lot of difficulty learning it.

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I don't know of any really good free resources, but I can recommend this really good book to you . It's worth buying.



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I created a resource to get started with shaders:

http://wiki.unity3d.com/index.php/Getting_Started_with_Shaders



Be forewarned, this was three years ago - I have since moved away from Unity3D and it looks like someone else hasn't updated it since then.

As it is a wiki, I encourage everyone to update it with the resources they find useful.

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