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* Lighting in Vertex Shaders
** Lighting Formulas
**: [http://msdn.microsoft.com/en-us/library/ff471376%28v=vs.85%29.aspx HLSL Intrinsic Functions]
*** Ambient
*** Diffuse
*** saturate()
*** length()
=== To Do ===
* reorganize framework code so that vertex shader receives product of world, view, and projection matrices
