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This is not a question about research , i am trying to create B-Spline curves but i don't understand how can i generate a clamped B-spline?More precisely the knots are fixed($m = n + p + 1$) , how can i make first 4 and last 4 knots idenctical, as an example shown below? Picture is in attachment and source : http://www.cs.mtu.edu/~shene/COURSES/cs3621/NOTES/spline/B-spline/bspline-curve.html enter image description here

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The knot vector is part of the b-spline definition. So, just make the first 4 knots 0.0 and the last 4 knots 1.0 and the resulting cubic b-spline curve will be clamped.

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    yes i calculated values and found that this also changes the shape of the curve! is this correct? – 2017-03-04
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    Not sure what you mean by "this also changes the shape of the curve". You have degree, knot vector and control points that fully defines a B-spline curve. What "shape of the curve" are you comparing against? – 2017-03-04