Dilemma

**There is two spline curve in two different plane , how to make loft with these two cure and without any section profiles **

**or in another word **

** how make body with converting one spline curve to another?**

from point of mathematician for any given section , curve of section related to the derivative value of two spline

dH(X,Y) [c]=dF(X,Z)[a]xCos(α) + dG(Y,Z)[b]xSin(α)

derivative value in any given point in section curve “H” related to trigonometry proportion of derivative value in curve “F” & “G”

so it means with two defined spline , the section profile could be defined in any given section , but I don't know who to find the spline function with knowing its spline parameters and how to find the section profile for lofting purpose