authors 
Bartels, R.H., Beatty, J.C. and Barsky, B.A. 
year 
1987 
title 
An Introduction to Splines for Use in Computer Graphics and Geometric Modeling 
source 
Morgan Kaufmann Publishers, Los Altos, CA 
summary 
The most basic output primitives in every computer graphics library are "lineSegment()" and "Polygon()", ortheir equivalents. These are, of course, sufficent in the sense that any curved line or surface can be arbitrarrily well approximated by straight line segments or planar polygons, but in many contexts that is not enough. Such approximations often require large amounts of data to obtain satifactory smoothness, and they are awkward to manipulate. Then too, even with the the most sophisticated continous shading models, polygonaltechniques can resultin visually ojectionable images. Mach bands may be apparent at the borders between adjacent polygons, and there is always a telltale angularity to polygonal silhouettes. Hence many modeling systems are augmented by circles, spheres, cylinders, etc. and allow such simple primitives to be combined to form quite complex objects. 
series 
other 
references 
Contenttype: text/plain

last changed 
2003/04/23 13:14 
