Create a surface using these curves (two directions), defining end conditions of the surface at the centerline. It would make sense to attempt to create this surface after defining the new centerline, bottom side curve and the side body curves that are at the most forward and most aft station. The reason to do this is to make sure that these curve really do intersect and that you are on the right track (you know what you are doing).

Example of body with four curves, center curve normal to centerline datum.

Example of check on result of mirror surface (strange geometry is a result of cheap graphics card).

Delete the test surface just created and finish creating sectional curves at each station as shown below.

Creating a surface using these curves yields the following:

Note the discontinuity (wrinkled surface) on the right (near the rear of the car). This needs to be fixed. Create additional points and a new longitudinal curve to help the computer direct the creation of the surface.

Showing new surface made to create points at the intersection of the new surface and existing curves. A new curve was created through the points and use to drive the surface.

After modifications were made to the curves at Stations 8 and 9 and the location of the new intermediate curve was tweaked (notice that the curved vertical surface does not appear. It was set 100% transparent.

Using the Analysis – Surface tool (with a vertical plane helping define the Slope), we can get a better idea of curvature as shown below.

It is possible to create an approximate surface (in this case 20 patches in both U and V directions, with a smoothness of .5). You can see that we have “lost” some definition, but gained “fairness”.

Showing both surfaces overlaying each other (blue is approximate surface).

Finally settled on an accuracy of .1 to not loose too much detail, yet still smooth out any bumps. (Accuracy of 1 and .001 give essentially the same result, that of an exact blended surface . An accuracy of .99 will give the worst approximation of the true surface, yet the fairest.)

We can remove additional surface discontinuities (if necessary) by dynamically pushing and pulling on the surface.