Sections > Defining Section Locations

The first step to getting sections, of course, is to define their locations. Orca3D provides an interface to quickly define a list of station, buttock, waterline, diagonal, cant, and incline locations. This list is maintained and stored with your model, and sections will be computed through the surface(s) that you have selected, at these locations.

Toolbar
Menu	Orca3D > Hull Design > Sections
Command	OrcaSections

1.	Start the command with the toolbar icon, menu selection, or keyboard command.

2.	Select the surface(s) to be included (or you may preselect the surfaces prior to starting the command)

3.	The Add Sections dialog will appear:

4.	Select the type of Section that you want to add to the list (Stations, Buttocks, Waterlines, Diagonals, Inclines, or Cants)

Define the Section locations by List (plane constant), and/or Spacing or Number. Checking "Update Bounding Box" will automatically fill in the minimum and maximum dimensions of the selected surface(s) in the direction perpendicular to the Section type in the Start and End fields. Note that if the Start value is less than the End value, the Spacing must be greater than 0, and if the Start is greater than the End, the Spacing must be less than 0.

6.	Select the Layer location for the Sections.

7.	Click Add to add your Sections to the Sections list. The list of Section locations will be shown in the Section tree.

8.	Click Preview to see planes in the model representing the Section locations.

9.	Repeat for other Section types.

10.	You may turn off visibility for one or more Sections, using the check boxes in the tree.

11.	You may right click on any Section in the tree to remove it, preview it, or change its color.

12.	Right-click on a node (for example, "Stations" to operate on all of the sections of that type.

13.	Click on OK. The Sections will be computed on the selected surface(s). If this surface is edited using the Orca control points, they will be updated in real-time.

14.

The calculation and visibility of all of the Sections may be temporarily turned off, using the OrcaShowSection command, or the icon (

). Individual Sections or groups of Sections may be turned off with the checkbox in the Sections tree. When turned off, the Sections will not be computed or displayed, and will not be included in analyses (such as the sectional area curve in Hydrostatics).

You may also define your section locations by importing the section list from another Rhino model. Click on the Import button, and navigate to the desired model. If the units of the imported section list are different from the current model, they are converted into the current model units. For example, if the station spacing in the imported model was one foot, and the current model is in meters, the station spacing would be 0.3048 meters. You must select the Layer Location for imported sections; that information is not imported from the other model.