What's the endgame - Class A, G1 only, up to G2???? What will this spline be used for - a planar surface? Would a line work better?
Knowing all of that helps to determine which of the above splines would be preferred/acceptable, if it's even needed.
Not sure what you gain using a spline to control shape if it's planar.
NX 22.214.171.124 MP11 Rev. A
GM TcE v126.96.36.199
GM GPDL v11-A.3.5.1
Hi @TimF Thanks! The curve is to be used as an internal controlling curve for a class A surface. Generally in my project I often need to fill a large openning with only several boudary curves. As taught in many previous threads, I try my best to improve and check the quality of those input curves.