Before you do the next step we need to reverse our curve direction go to Edit Curve - Reverse Curve Direction this will change the curve direction so you can add a point at the other end of the curve. Repeat the process of 24 with the bottom part of the curve, Repeat the cut point add Point process with the horizontal curve if it is needed.
The reason than we need our curves touching each other is because that is the only way the Square tool will work
26: Rebuild Curve/Square
In the same order select your curves go to Edit Curves - Rebuild Curve – Options, Change the parameter range to 0 to # Spans and in Number of Spans change to 10. Now that we have the same amount of CV’s in all 3 curves with the same orders selected go to Surfaces – Square, you can also use Boundary.*** The order in which you select the curves is important because that will determined the direction or pinch of your surface
27: Snap to Vertex
If for some reason you are getting a gap between the two surfaces this can be
fixed by selecting the surface on the left and go to Display - NURBS Components
– CV's, this way we can see the CV's of the surface without having to select it. Now select the other surface select the CV's and with Snap to point ON or by pressing V Snap the other surfaces CV
28: Tangency Between Surfaces
Now that we have this curve the first thing we can see is that it is too long. We can fix this by selecting the curve we just created right click select Curve Point and place it right before it bends. Now that we have our curve point where we need it go Edit Curves – Detach Curves. This will automatically cut our curve into two curves based on the location of our Curve Point
29: Result
After we have done the Cutting, snapping , rebuilding, Boundary and Tangency this the result we get. *** What we just did from 21 to 28, Is the process we are going to use to build a lot of our surfaces
