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Computation of Vectors •l and v : specified by the application •r: computed from l and n •Determine n –OpenGL leaves determination of normal to application; exception for GLU quadrics and Bezier surfaces DCP4516 Introduction to Computer Graphics 28
Plane Normals •Equation of plane: ax+by+cz+d = 0 •Normal can be obtained by n = (p 2 -p 0 ) × (p 1 -p 0 ) n DCP4516 Introduction to Computer Graphics 29
Page 1 and 2: Lighting and Shading Steve Lin Depa
Page 3 and 4: Why Do We Need Shading •Suppose w
Page 5 and 6: Factors that affect the“color”o
Page 7 and 8: Rendering Equation •The infinite
Page 9 and 10: Local vs Global Illumination •Cor
Page 11 and 12: Light Sources •General light sour
Page 13 and 14: Surface Types •The smoother a sur
Page 15 and 16: Ambient Light •The result of mult
Page 17 and 18: Specular Surfaces •Most surfaces
Page 19 and 20: The Shininess Coefficient α •Val
Page 21 and 22: Adding up the Components •A primi
Page 23 and 24: Modified Phong Model •Problem: In
Page 25 and 26: Using the Halfway Angle •Replace
Page 27: Example Teapots with different para
Page 31 and 32: Parametric Form •For sphere x = x
Page 33 and 34: Polygonal Shading •Curved surface
Page 35 and 36: Flat Shading Assessment •Inexpens
Page 37 and 38: DCP4516 Introduction to Computer Gr
Page 39 and 40: Gouraud Shading •Special case of
Page 41 and 42: Phong Shading •Interpolate normal
Page 43: Polygonal Shading Summary •Gourau

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