Navigation:  Hull Design > Inserting a Chine

Discontinuities in the hull, such as a chine or knuckle, can be modeled either by splitting the surface, or inserting a discontinuity directly into the surface. Orca3D includes a function to insert a discontinuity directly into a surface, allowing a single surface to be used to model a hull with multiple chines. This makes it easier to edit the hull, since you don't have to worry about keeping two surfaces joined.

To insert a chine, start the OrcaInsertChine command from the menu or command line. Select the surface into which the chine will be inserted, and then the direction of the chine (generally, the U direction is longitudinal, and the V direction is transverse). Next, select the location for the chine; it is inserted along an isocurve.

 

These images show a hull from the sailboat assistant, prior to a longitudinal chine being inserted:

 

 

Here the chine has been inserted. Note that while the control net has changed, the shape of the surface has not. If the new control points are not moved, the surface will continue to be smooth.

 

In the following images, the points around the chine have been edited, but only for the aft three columns in the control net.

 

 

Finally, with stations defined, it's easy to see that the chine has developed in the aft portion of the hull, and fades as it goes forward, because the control points around the chine have not been edited since the chine was inserted.