EXERCISE 4.2 The four corner points of a bilinear surface are Poo = (0, 0, 1), P10 = (1, 0, 0), Po₁ = (0.5, 1, 0), and P₁1 = (1, 1, 0). Derive the parametric expression of the bilinear surface. Derive the parametric expression of the normal vector on the bilinear surface.

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