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Hi There, I'm currently writing a feature that will elevate the degree of a given B-Spline by generating new control points. My feature generates a curve and the points correctly. I am running into an issue with the Knot vector for this augmented curve. I am constructing the knot vector as an FDoubleSeries, this appears to be as per the documentation for the curve command .setKnotVector() The code evaluates with no errors, I can see that the correct number of items are in the series, but the double series does not appear to play nicely with anything else. I'm at a bit of a loss. I've placed the relevant code below and attached the working file, please excuse it's structure, it is a practice exercise. Any help is appreciated! //Constuct Knot Vector FInteger numPoints(augPoints.getSize()) FDoubleSeries knotVector([]) //Case where num Points is 10 or less if(numPoints<=10) loop(numPoints) knotVector.add(0) endloop loop(numPoints) knotVector.add(1) endloop //Case where num Points is greater than 10 elseif(numPoints>10) FDouble knotFraction(1/((numPoints-10)+1)) loop(10) knotVector.add(0) endloop loop(numPoints-10) knotVector.add(knotFraction) knotFraction += knotFraction endloop loop(10) knotVector.add(1) endloop endif echo("" + knotVector.getCount()) beginPersistentSection() BSplineCurve augCurve() augCurve.setDegree(augPoints.getSize()-1) augCurve.setKnotVector(knotVector) augCurve.setPointList(augPoints) endPersistentSection() Q2.cdbc