In matmatic, a basic GC shader with Diffuse and Blinn effects that uses a color map would look like this:

gamma = 2.2
clr = ImageMap("").labelled("Color Map")
s = Surface(clr, 0, 1, 0)
clr = clr ** gamma
s.Alternate_Diffuse = (Diffuse(clr, .8) + Blinn()) ** (1 / gamma)

One that does basic Fresnel reflection (involving a cheap and bad approximation instead of the real Fresnel effect calculation) would change that last line to this:

fe = EdgeBlend(.04, 1, .07)
s.Alternate_Diffuse = (Blend(Diffuse(clr, .8), Reflect(), fe) + Blinn()) ** (1 / gamma)

Of course if I gave you the matmatic function for the actual Fresnel effect (which requires 14 nodes all by itself) you'd just say this:

fe = TrueFresnel(1.33)

That's the beauty of matmatic - complicated multi-node things become as simple to use as the built-in nodes.

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