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Shading •Why does the image of a real sphere look like •Light-material interactions cause each point to have a different color or shade •Need to consider –Light sources –Material properties –Location of the viewer –Surface orientation DCP4516 Introduction to Computer Graphics 4
Factors that affect the“color”of a pixel •Light sources –Emittance spectrum (color) –Geometry (position and direction) –Directional attenuation •Objects’surface properties –Reflectance spectrum (color) –Geometry (position, orientation, and micro- structure) –Absorption DCP4516 Introduction to Computer Graphics 5
Page 1 and 2: Lighting and Shading Steve Lin Depa
Page 3: Why Do We Need Shading •Suppose w
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 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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