Snell's Law:
http://en.wikipedia.org/wiki/Snell%27s_law
Fresnel:
http://en.wikipedia.org/wiki/Fresnel_equations
Fresnel GLSL Glass:
http://www.cse.ohio-state.edu/~kerwin/refraction.html
Shading Cg Language Reference Has Blending Functions For Technique and Pass
http://www.racer.nl/reference/shadereng.htm
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