Dear Zbuffer I’ve just checked my code and fix it with your way. Result is excellent, it’s right. May be my the knots in spline don’t match. Thanks…

Thank Zbuffer very much! But in my code: lin = splineshape() addnewspline lin addknot lin 1 #corner #line [0,0,0] addknot lin 1 #corner #line [0…

Thank guruware!!! :applause: Your help is very useful for me. I try to make a script: lin = splineshape() addnewspline lin addknot lin 1 #corner …

Thank erilaz! I know “k” refers to knot index, in that case “k” = 1 to 65. But I don’t understand that why variable track = 3*(k-1)+2. How do you us…