Computer Graphics Primer

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Computer Graphics Primer

• Jyun-Ming Chen
• Fall, 2001

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Contents

• Rendering
• Light and Shading
• Phong and Gouraud Shading
• Texture Mapping

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Rendering

• The computation required to convert 3D scene to
  2D display photo-realistically

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Shading

• the gradation (of color) that give the 2D images
  the appearance of being 3D
• light-material interaction
• specular, diffuse, translucent

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Light

• point, spot, distance lights
• ambient light to account for uniform level room
  lighting
• describe a light source through a three-component
  (RGB) intensity

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Phong Illumination Model

• L light source property R reflection property
• ambient reflection
• diffuse reflection
• specular reflection (more later)
• final result

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Phong Model (cont)

• For multiple light sources

• More on Specular

a?
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Shading Modes

• Flat vs. Smooth
• Gouraud (intensity interpolation)
• Phong (normal interpolation)

• Local vs. Global

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Gouraud and Phong
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Texture Mapping

• A way to render realistic picture w/o using too
  many polygons

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Texture Coordinate System

• Each vertex in a polygon specifies its texture
  coordinates, then map to the given image to
  determine the corresponding texture

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