9ine

08-16-2004, 10:47 PM

What do numbers in knots array mean and why do we need them? can't clearly understand.

View Full Version : gluNurbsSurface() what is knots array?

9ine

08-16-2004, 10:47 PM

What do numbers in knots array mean and why do we need them? can't clearly understand.

mikael_aronsson

08-16-2004, 11:41 PM

The knots define how the polynomial pieces are blended together with the proper smoothness.

The sequence of knots is assumed to be nondecreasing, i.e. t <= t+1. Each successive pair of knots represents an interval [t, t+1) for the parameter values to calculate a segment of a shape.

The actual values of the knots is not important, it is the relation between the knots that are used.

I suggest to take a look at this pdf (http://www.mat.ucsb.edu/~c.ramakr/articles/dls/nurbs.pdf)

Mikael

The sequence of knots is assumed to be nondecreasing, i.e. t <= t+1. Each successive pair of knots represents an interval [t, t+1) for the parameter values to calculate a segment of a shape.

The actual values of the knots is not important, it is the relation between the knots that are used.

I suggest to take a look at this pdf (http://www.mat.ucsb.edu/~c.ramakr/articles/dls/nurbs.pdf)

Mikael

9ine

08-17-2004, 03:19 AM

thanks for link

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