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Reflection Characteristics of Surfaces (cont.)

• Specular reflection (cont.)

  • Phong approximation: cosna

  • as n increases, highlight is more concentrated, surface appears glossier

• Illumination model with all three terms

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  • ks: specular coefficient, fraction of light reflected

  • This is an easy-to-evaluate equation that gives useful results. It is used in most graphics workstations, but it has no basis in theory and does not model reflections correctly.
    
    

Viewing & Rendering - 09 MAY 95

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