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13
Representation of Object Surfaces
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most common representation of objects is polygonal mesh/net
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collection of polygons that approximate the outer surface or
skin of the object
14
Representation of Object Surfaces
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modern hardware capable of rendering simple polygons fast
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NVIDIA GeForce2 Ultra: 31 million polygons/s
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PlayStation2: more than 60 million polygons/s (raw speed)
✦
many factors can affect these numbers (polygon size,
image size, lighting, type of shading, etc) so don’t take
them at face value
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if polygons are small enough (i.e. if sufficiently large number of
polygons are used) resulting images can be realistic
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“reality is 80,000,000 polygons per frame”
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Carpenter, Catmull, and Cook
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2.4 billion polygons per second
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complexity of scenes grows faster than hardware speed
✦
we’re still many years away from this number
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Lines
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a line is 1dimensional
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has infinite length, but no other dimension
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a line is defined by 2 noncoincident points P and Q
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 Winter '12
 BURTON

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