I'm a CS major student now struglling with Computer
Graphics,hoping you'd help me out.
I have problem understand following sentence from my textbook
'Computer Graphics with OpenGL':
"To make viewing process independent of the requirements of any
output device,graphic system convert object descriptions to normalized
coordinates and apply the clipping routines."
Why normalized coordinates could make viewing process independent
of the requirements of any output devices?
Isn't the projection coordinates already independent of output
device?We only need to first scale and then translate the projection
coordinate then we will get device coordinate.So we do we need first
convert the projection coordinate to normalized coordinate first?
"Clipping is usually performed in normlized coordinates.This
allows us to reduce computations by first concatenating the various
Why clipping is usually performed in normlized coordinates? What
kind of transformation concatenated?
||6/9/2010 1:45:33 PM