   Books - ShaderX ver 2 or 3?
  I noticed on the gamedev home page they are highlighting ShaderX2 as a good book.  Then I noticed there is also a ShaderX3 available.  Has anyone gotten both of these, and if so which would you suggest, X2 or X3?Or are they both worth getting?Thanks   
  There are two different versions of shader x 2, I have read both.   I also have Shader X 3 but only have looked over some chapters.The books are a collection of shader techniques and its use really depends on how experienced you are with shaders.Shader X2:  Introduction and tutorials is a good book if you have had some basic exposure to shader development.  It covers shadow techniques and some very good introductory topics.Shader X2: Tips and Techniques and Shader X 3 are good books if you have a good understanding of shader programming and have developed shaders in the past.  They cover very specific techniques on different areas.   