【求助】学习R12的Class-A模块遇到的一个问题！

这段关于WrapCurve 功能实现的解释我看不明白！！惭愧！英文不行！请老大们帮帮忙，谢谢先！
  
WrapCurve Definition
  
How Is the Deformation Computed ?  
  The following diagrams will help you understand how the deformation is computed in relation to the entered data, i.e. reference/target curves and possible spine.  
   
  3D view, where:  
r1, r2 are the reference curves  
t1, t2 are the target curves  
P is a plane normal to the spine  
  Planar view, where:  
Ir1: is the intersection between P and r1  
Ir2: is the intersection between P and r2  
It1: is the intersection between P and t1  
It2: is the intersection between P and t2  
   
  The deformation is computed in each plane P, normal to the spine. By default the spine is the first reference curve, but you can select a new spine using the Spine field in the Reference tab.
In each plane P, the system computes the intersection between the plane and each curve.
A curve (Cr) is created between the first intersection point (Ir1) and the last intersection point (Irn) on reference curves, passing through all the intersection points between these two.
Similarly, a curve (Ct) is created passing through all the intersections points between the first (It1) and the last intersection point (Itn) on target curves.
  
Then, for each point Q, resulting from the intersection of the surface to be deformed with the plane, Q is projected onto the curve Cr according to the projection direction (dir). This projection direction is the vectorial product of: vector(lspine, lr2) ^ vector normal to P.
The result of the projection of point Q is the point Qr, which parameter on Cr is v.
Similarly, a point Qt is created on the curve Ct, with the same v parameter as point Qr on curve Cr .
  
Then Qd, that is the transformation of point Q according to the wrap curve deformation, is obtained by adding: Q+vector(Qr,Qt)

第二张图