Computer Graphics
Bing-Yu Chen
National Taiwan University
Illumination and Shading
Illumination Models
Shading Models for Polygons
Surface Detail
Shadows
Transparency
Global Illumination
Recursive Ray Tracing
Radiosity
The Rendering Pipeline
Why We Need Shading ?
Suppose we build a model of a sphere
using many polygons and color it with
only one color. We get something like
But we want
Shading
Why does the image of a real sphere look
like
Light-material interactions cause each point
to have a different color or shade
Need to consider
Light sources
Material properties
Location of viewer
Surface orientation
Light Sources
General light sources are difficult to
work with because we must integrate
light coming from all points on the
source
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