Interactive Computer Graphics Fall 2008
deck author
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The Phong Model can be used for what?
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The phong model can be used with real time graphics systems
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When shading, what do you need to consider?
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Light souces
material properties
location of viewers
surface orientation
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some is scattered some is absorved
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what can be explained by the rendering equation?
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The infinite scattering and absorption of light can be described by the rendering eqution
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What is the rendering equation?
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the rendering equation is global and includes
shadows
multiple scattering from object to object
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shadow
multple reflection
translucent surface
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What does corrent shading require?
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correct shading requires a global calculation involving all objects andlight sources
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Corrent shading is incompatible with what>?
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Is incompatible with pipeline model which shades each polygon independently(local rendering)
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Light that strikes an object is partially
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1. absorbed
2. scattered( refleded)
Example: A surface appears red under white light bcause the red component of the light is reflected and the rest is absorbed
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How is the reflected light scattered?
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The reflected light is cattered in a matter that depends on the smoothness and orientation of the surface
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