Surface Fitting

http://www.cadfamily.com/a/CAD_CAID/Marine/Surface-Fitting_1633.html

14.1. Creating a Maxsurf model from a lines plan
It is often necessary to create a Maxsurf surface model from an
existing lines plan. There are two main steps to this:
1. Generate marker data which will define points on the hull
2. Fit surfaces to the marker data.
14.1.1. Generating marker data
The lines plan may be in one of several different formats:
14.1.1.1. 3D DXF computer file
If the existing lines plan is in 3D DXF format, it can be read directly
into Maxsurf and markers generated automatically. To do this, start a
new design, select File | Import | Import DXF markers, select the file
and then specify the orientation of the design in the DXF file.