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Viewing & Rendering
Polygon Shading
Use any illumination model
Three methods; each treats a single polygon independent of all others
- Constant
- Gouraud (intensity interpolation)
- Phong (normal-vector interpolation) [not covered]
Constant shading
- single intensity value per polygon
- if polygon mesh is an approximation to curved surface, faceted look is a problem
- facets exaggerated by mach band effect
Note: These illumination and shading methods are not global. The effects of light on one polygon do not affect the lighting or shading on any of the other polygons.
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Viewing & Rendering - 09 MAY 95
Page 30 of 31
sl@cs.brown.edu
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