Source: Les Piegl, Wayne Tiller;
The NURBS Book; New York: Springer-Verlag, 1997; ISBN: 3-540-61545-8.
<http://www.springer-ny.com/detail.tpl?ISBN=3540615458>
The basis function is defined from knots value, and knot vector is a set
of the knots.
This way, if you use multiple knots at both end points, curve's end points
or surface's corner points are located at control points.
Matematica e Cultura 2002 Stewart Dickson |