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Global Effects shadow transmission multiple reflection translucent surface DCP4516 Introduction to Computer Graphics 8
Local vs Global Illumination •Correct shading requires a global calculation –Incompatible with a pipeline model which shades each polygon independently (local rendering) •However, in computer graphics, especially real time graphics, we are happy if things “look right” –many techniques for approximating global effects exist DCP4516 Introduction to Computer Graphics 9
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: Rendering Equation •The infinite
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 and 28: Example Teapots with different para
Page 29 and 30: Plane Normals •Equation of plane:
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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