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Gouraud Shading

• Gouraud (intensity interpolation) shading

  • Use for polygon approximations to curved surfaces (e.g., the milling machine's head)

  • Linear interpolation of intensity along scan lines

  • Eliminates intensity discontinuities at polygon edges

  • Step one: calculate "vertex normals" as average of surrounding polygons normals. Only an approximation
    
    

  • Step two: calculate illumination at each vertex

  • Step three: interpolate illumination along polygon edges

  • Step four: interpolate illumination along spans

• Works well if polygons are small
  
  

Viewing & Rendering - 09 MAY 95

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