13
Representation of Object Surfaces
■
most common representation of objects is polygonal mesh/net
◆
collection of polygons that approximate the outer surface or
skin of the object
14
Representation of Object Surfaces
■
modern hardware capable of rendering simple polygons fast
◆
NVIDIA GeForce2 Ultra: 31 million polygons/s
◆
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
■
if polygons are small enough (i.e. if sufficiently large number of
polygons are used) resulting images can be realistic
◆
“reality is 80,000,000 polygons per frame”
✦
Carpenter, Catmull, and Cook
◆
2.4 billion polygons per second
✦
complexity of scenes grows faster than hardware speed
✦
we’re still many years away from this number
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document15
Lines
■
a line is 1dimensional
◆
has infinite length, but no other dimension
■
a line is defined by 2 noncoincident points P and Q
This is the end of the preview.
Sign up
to
access the rest of the document.
 Winter '12
 BURTON
 Polygons, Nvidia, Line segment, convex polygon

Click to edit the document details