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Offset Tables |
  
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Offset Tables |
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Although most vessels are built with numeric methods, sometimes a traditional table of offset is still required. Orca3D can produce a table in Excel showing buttock heights, waterline half-breadths, and 3D curve (sheer, chine, etc.) intersections with tables.
Toolbar |
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Menu |
Orca3D > Hull Design > Offset Table |
Command |
OrcaOffsetTable |
Note: You must have Excel installed for this function to work.
The first step to creating a table of offsets is to create the curves that will be included. These can be created with the Orca Sections command, or any other curve creation routines in Rhino. In particular, you may wish to define curves for:
| • | the sheerline by using Rhino's DupEdge command (in the menu, select Curve > Curve from Objects > Duplicate Edge). You should give the curve a name, using Rhino's Properties command, as in this example: |
| • | If your hull has chines that are surface edges, follow the same procedure. If the chines are in the interior of the surface, use Rhino's ExtractIsoCurve command (in the menu, select Curve > Curve from Objects > Extract Isocurve) to create a curve that matches your chines. |
Start the OrcaOffsetTable command from the command line, the menu, or by right-clicking on the icon. You will immediately see the prompt asking what type of curves to include in the offset table:
| • | Include all Curves: All of the curves in your model will be included. They are tested to see if they are planar, and lie in a station, buttock, or waterline plane. If they do not, they are treated as "3D curves." If you have named the curves, their names will be shown in the output. If not, they will simply be labeled "3D Curve." |
| • | Include Orca3D Curves Only: This will select all stations, buttocks, waterlines, diagonals, cants, and inclines that were defined in the Orca Sections dialog. |
| • | Select Curves to include: You will be prompted to select the curves that you would like to have included. Hit Enter when you are finished selecting. |
No matter which method you use, the program must be able to find at least one station, and at least one buttock, waterline, or 3D curve. Note: The number of buttocks plus 3D curves and number of waterlines plus 3D curves must not exceed 24.
A dialog will appear with the number of curves of each type that have been found:
Click on Yes to create the table. An instance of Excel will be opened, and the data filled in the worksheets:
If multiple intersections are found on a single station, there will be two rows for that station. If there is more than one curve that describes a particular station, there will be two entries in the offset table. If possible, you should join all of the curves that are at a single station location.
