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Q5. [25 points] Vertex coordinates of a 3D shape (a tetrahedron) and illumination parameters are given below. Consider that Noa = (0,0,1)" and Nob = (-0.15, -0.85,0.5)" are two possible normal vectors we can use for vertex Po. Calculate two possible intensities at vertex P, for these vectors by using the basic (Phong or modified Phong/Blinn) illumination model to see how much difference there will be between them. (Note: Variables representing vectors are written with an arrow above and exponent T means transpose.) V = (0,0,1)", I1 = 0.8, Ka = 0.1, Ka = 0.5, Ks = 0.2, ns = 1, 1 = 0.5, L = (0,0.8,0.6) P2 (1,2,-1) Po (0.0.0) P3 (-3,-1,-3) (4,-2,-2) P1 2