Illumination and Shading
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Gouraud Calculations

Ia = I1 - (I1 - I2) (y1 - ys)/(y1 - y2)
Ib = I1 - (I1 - I3) (y1 - ys)/(y1 - y3)
Ip = Ib - (Ib - Ia) (xb - xp)/(xb - xa)

(1) calculate intensity at vertices (I1, I2, I3) from illumination model.

(2) interpolate vertex intensities along edges (Ia, Ib)

(3) interpolate intensities at span extrema to pixels (Ip)
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