When you are satisfied that the splines fit the marker data, you may then fit a complete surface through the transverse splines. The surface may then be saved as a Maxsurf design file.

If necessary, the surface net may be refined manually to obtain a better fit to the markers.

Prefit is not suitable for modelling discontinuities in designs such as the hard chined hull shown below.

Designs featuring chines or discontinuities should be modelled as independent surfaces. The above design should be modelled as below, using two Prefit surfaces, with the chine as a common surface edge. Once the two surfaces have been fitted, they can be merged together in Maxsurf.

Prefit allows you to choose how many control points you wish to use to model the hull surface. The choice of the number of control points to use in the generation of a surface and its net is a matter of trial and error, as different designs will require different numbers of control points. As a rough guide, use slightly more control points than you would use to model a similar hull in Maxsurf.