In the previous section you learnt how to use several fairing tools that help you display and adjust the shape of curves or surfaces and reduce any unwanted inflections, bumps or unwanted discontinuities. In this section we will look at ways to purposely model modelling discontinuities in a curve or surface.
One can distinguish different types of discontinuities that can exist in a ship’s hull surface:
Knuckle or chine
A chine that runs along the full length of the ship
A knuckle running along part of the length of the vessel
Deck edge discontinuities
A step up in the deck edge to create a forecastle
Interior surface discontinuities (openings)
An opening in the surface creates a bow thruster.
For each type of discontinuity there are different modelling methods that you can use:
§ Compacting control points
§ Bonding, we will discuss this later but it is basically stitching the surface edges together.
§ Trimming, also discussed later but can best be described as a feature where you use one surface to cut a portion out of another surface.
|
Discontinuity type |
Method |
||
|
Compacted Control Points |
Bonding |
Trimming |
|
|
Chines & knuckles |
|
|
Not recommended |
|
Edge cuts |
Not
|
|
|
|
Openings |
|
|
|
Go to the section on Compacting Control Points.
