What about R,G,B,A Interpolation?

For Gouraud shading, need to interpolate R,G,B,A. Can do this just like Z!!!

Vmax(x3,y3,r3)

Vmin(x1,y1,r1)

a

c

b

Emaj

Ebot

Etop

Vmid(x2,y2,r2)

Red Interpolation

dr/dx = -A/C = Emaj.dr * Ebot.dy - Emaj.dy * Ebot.dr

Emaj.dx * Ebot.dy - Emaj.dy * Ebot.dx

dr/dy = -B/C = Emaj.dx * Ebot.dr - Emaj.dr * Ebot.dx

Emaj.dx * Ebot.dy - Emaj.dy * Ebot.dx

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