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Thread: gluNurbsSurface() what is knots array?

  1. #1
    Junior Member Newbie
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    gluNurbsSurface() what is knots array?

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

  2. #2
    Senior Member OpenGL Pro
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    Kristianstad,Skåne,Sweden
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    Re: gluNurbsSurface() what is knots array?

    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

    Mikael

  3. #3
    Junior Member Newbie
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    Re: gluNurbsSurface() what is knots array?

    thanks for link

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