The Phong illumination model for a single point light source is given by I-klatkal (N-L)+kl (R.E Draw a diagram to show the relationship among vectors L. N, R and E at a point on a surface If the point light source is located at (9, 7, 1) and the viewing position is at (1, 8, 1), compute the illumination intensity at point (1, , l) on a triangle bounded by vertices (-1,0,3), (5. . O) and (1, 2, 0). Here we assume la= 10, 1-100.-02. = 0.3. k,-0.4. and n-2 (ii) The Phong illumination model for a single point light source is given by I-klatkal (N-L)+kl (R.E Draw a diagram to show the relationship among vectors L. N, R and E at a point on a surface If the point light source is located at (9, 7, 1) and the viewing position is at (1, 8, 1), compute the illumination intensity at point (1, , l) on a triangle bounded by vertices (-1,0,3), (5. . O) and (1, 2, 0). Here we assume la= 10, 1-100.-02. = 0.3. k,-0.4. and n-2 (ii)