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Reflection Characteristics of Surfaces (cont.)

• Diffuse reflection

  • Typical of dull, matte surfaces

  • Independent of viewer position

  • Dependent on light source position

  • 
    
    
    • Ip: intensity of point light source

    • Kd: diffuse reflection coefficient (0 Kd 1); specifies fraction of Ip reflected
      
      

• This is Lambert's cosine law

  • Add an ambient term:

  • 

• For colored lights and surfaces do this for R, G, and B components.

Viewing & Rendering - 09 MAY 95

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