Specifies a landing curve by defining X, Y, and Z coordinates of points along the landing curve. Each point along the landing curve is defined on a single row in the table. You must define two out of the three coordinates. The software derives the third coordinate for you and highlights the derived coordinate in blue.
Dialog Box Controls
Point Type
Select an option for each point:

Definition  The point on the row is used to define the landing curve, and the curve transitions smoothly through the point.

Knuckle  The point on the row is used to define the landing curve, and the curve knuckles at the point.

Display  The point is computed based on the intersection of the landing curve and another object, as defined by Derived Points in the Table. Display points are not definition points and are not saved as part of the landing curve definition.
Intersecting Object
Select a seam or profile stiffener on the selected plate system, or another plate system that is bounded or split by the selected plate system.

If Intersecting Object is not selected, then two of the X, Y, and Z coordinates must have values. The third coordinate is derived.

If Intersecting Object is selected, then one of the X, Y, and Z coordinates must have a value. The other two coordinates are derived.
X Reference
Select a frame (YZ) grid plane to specify the Xcoordinate of the landing curve point. You can also explicitly specify the X coordinate by typing the point's location along the Xaxis.
X Offset
Type an offset value from the X reference.
Y Reference
Select a buttock (XZ) grid plane to specify the Ycoordinate of the landing curve point. You can also explicitly specify the Y coordinate by typing the point's location along the Yaxis.
Y Offset
Type an offset value from the Y reference.
Z Reference
Select a waterline (XY) grid plane to specify the Zcoordinate of the landing curve point. You can also explicitly specify the Z coordinate by typing the point's location along the Zaxis.
Z Offset
Type an offset value from the Z reference.

Points for which you typed coordinates are usually definition points.

Knuckle points cannot be at the ends of a landing curve.

Every curve must have a minimum of two definition points.
Curvature Vector

Display Method  Specifies how you want the curvature vectors to appear when you click Preview. Select Number of vectors to specify a fixed number of vectors that the software is to distribute evenly along the landing curve. Specify the number of vectors in the Count box. Select Vector spacing to place vectors along the landing curve a fixed distance apart. The software determines the number of vectors based on the landing curve length and the spacing distance specified in the Spacing box.

Count  Specifies the number of vectors to distribute evenly along the landing curve preview. This option is only available when Display Method is set to Number of vectors.

Spacing  Specifies the distance between vectors along the landing curve preview. This option is only available when Display Method is set to Vector Spacing.

Range  Select where along the landing curve preview you want to see curvature vectors. Select Entire Curve to display curvature vectors along the entire landing curve. Select Between Definition Points to display curvature vectors only between definition points.

Scale Factor  Specify a scaling factor value for the curvature vectors. The larger the value the larger the curvature vectors appear in the graphic view.
Intersection Plane
This option is available only when the coordinates of two points are known for a landing curve on a plate system with curvature (such as the hull). When the coordinates of only two points are known, multiple solutions exist to define the landing curve. You can define an intersection plane passing through the points to complete the landing curve definition.

Base Plane  Specifies the plane in which to measure the angle used to define the intersection plane.

From  Specifies the plane from which to measure the angle used to define the intersection plane. Select Horizontal or Vertical.

Angle  Specifies the angle of the intersection plane, measured from the Horizontal or Vertical plane. Use the unit of measure selected in Tools > Options.

Normal to Base Plane  Select to orient the intersection plane normal to the base plane. The intersection plane appears as a straight line when viewed in the direction of the Base Plane. Clear to orient the intersection plane by the minimum linear distance between the two points as allowed by the specified Angle.

Base Plane is similar to the angle Plane in Profile Orientation Definition.

From plane is similar to the Reference plane in Profile Orientation Definition.

Angle is similar to the Angle in Profile Orientation Definition.

You can create a profile with a planar web if the Angle for the landing curve is the same as the Angle for the profile orientation.
In the following example, A is the Base Plane, B is the From Horizontal plane, C is the Angle, D is the final Intersection Plane, and E is the landing curve on the selected plate system.
Derived Points in the Table
These options control when and how the software derives points between definition points that you define. Derived points are not saved as part of the landing curve definition.

X: Transverse  Select this option to have the software derive points where the landing curve intersects each X grid plane. You must select a coordinate system.

Y: Buttock  Select this option to have the software derive points where the landing curve intersects each Y grid plane. You must select a coordinate system.

Z: Waterline  Select this option to have the software derive points where the landing curve intersects each Z grid plane. You must select a coordinate system.

Seams  Select this option to have the software derive points at the intersection of the landing curve with seams on the selected plate system.

Stiffeners  Select this option to have the software derive points at the intersection of the landing curve with stiffeners on the selected plate system.

Plates  Select this option to have the software derive points at the intersection of the landing curve with other plate systems bounded or split by the selected plate system.
Preview
Displays the landing curve, as currently defined by the points in the table, in the model. You can select Preview multiple times to see changes made to the landing curve as you add and edit points in the table.
Prints a copy of the landing curve table, as it is currently defined.
Close
Closes the dialog box.
RightClick Menu Commands
There are several rightclick commands available to help in defining the points in the table.
Cut Cell
Removes the contents of the selected cell and moves the contents to the Clipboard.
Copy Cell
Moves a copy of the selected cell contents to the Clipboard.
Paste Cell
Places a copy of the Clipboard contents in the cell.
Cut Row
Removes the contents of the selected row and moves the contents to the Clipboard.
Copy Row
Moves a copy of the selected row contents to the Clipboard.
Paste Row
Places a copy of the Clipboard contents in the row, replacing any existing values in the row.
Paste Reverse
If more than one row is copied, this command places a copy of the Clipboard contents in the same number of rows but in reverse order, replacing any existing values in the rows.
Insert Cut/Copied Rows
Inserts the row on the Clipboard into a new row in the table.
Insert Reverse Rows
If more than one row is copied, this command inserts the rows from the Clipboard in the table in reverse order.
Delete
Removes the contents of the selected cell.
Insert Row
Inserts a new, blank row into the table above the selected row.
Remove Row
Removes the selected row from the table.
Make Derived
Marks the selected reference as the one you want the software to derive.
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