Options on this ribbon vary depending on the selected geometric construction interface.
Select
Selects an existing geometric construction object, such as a curve or surface, to
edit or delete.
Add
Selects geometry that defines a new geometric construction. This option is used with
the numbered step options, below.
Delete
Deletes a selected geometric construction.
Cancel
Cancels the macro, closes the geometric construction ribbon and the Geometric Construction Palette dialog box, and then returns to the main command ribbon.
Close
Verifies the validity of values selected for the options, closes the geometric construction
ribbon and the Geometric Construction Palette dialog box, and then returns to the main command ribbon. The selected values are
still available when is selected again on the main command ribbon.
Geometric Construction
Displays the current geometric construction interface. You can also select:
More
Opens the Select Geometric Construction dialog box. All geometric construction interfaces delivered with the software are
available. For more information, see GeometricConstructions.chm and CMNSTRGeometricConstructions.chm
in the [Product Folder]\Programming\Help folder, available when Programming Resources is installed.1, 2, 3, ...  Selects required input items that define the geometric construction, such as points,
edges, profile crosssections, or geometry created by other geometric constructions.
The number of steps is defined by the selected interface. The type of object for each
step is identified in the system prompt.
, , , ...
Selects optional input items that define the geometric construction, such as knuckles,
line strings, and vectors. The number of steps is defined by the selected interface.
The type of object for each step is identified in the system prompt.
Color Coding
For a new geometric construction, you can identify the status of input items by the
background color of the step:
 No background color when there is no input.
 Yellow background when an input is selected.
 Blue background when an input was selected for the previous geometric construction.
The input can also be used for the current geometric construction.
Selected inputs display highlighted in pink in the Workspace Explorer and as pink dotted lines in the graphic view:
When changing an existing geometric construction to a different definition, colors
represent the different value changes:
and  No background color when you keep the value of the original geometric construction.
and  Yellow background when you change a value.
and  Blue background when the software changes a value to a new suggested value.
Reject
Clears the current selections.
Accept
Accepts the current selections, and displays a preview.
Continue
Completes geometric construction definition. The Geometric Construction ribbon is
still displayed, and parameters for additional geometry can be defined.
The geometric constructions are not created and saved to the model until you click
Finish on the main command ribbon and create the model object.
Curves
Projection Method
Specifies how a curve or point is projected on a surface.
Construction
Specifies creation of a construction surface. When defining a seam, a construction
surface allows splitting of the surface with ACIS tolerances specified in the software.
A construction surface is not needed for a profile.
Extension
Specifies the extension of the curve beyond the selected surface or construction.
Extension at Start
Specifies the extension of the beginning of a curve beyond the selected surface or
construction.
Extension at End
Specifies the extension of the end of a curve beyond the selected surface or construction.
Distance
Specifies the distance of a point along a curve relative to the selected coordinate
system.
Distance Method
Specifies how a point is measured along a curve.
Distance Direction
Constrains a point to the reference plane or surface in the specified direction.
Side Ambiguity
Specifies the direction to use when point projection has more than one solution. The
closest point projection in that direction is used.
Point at Minimum Distance
Numbered steps have the following usage for Point at Minimum Distance:

1  Selects the coordinate system used for the specified directions and axes.

2  Selects the first plate system or surface.

3  Selects the second plate system or surface.

4  Selects the sketching plane that intersects the selected plate systems or surfaces.
If the same plate systems are also used as boundaries or for sketching in a parent
command, you must also specify them as boundaries or add them to Sketch 2D using Add Intersecting Item or Add Projection Item .
Method
Specifies the measurement method. Select one of the following options:

At girth then along normal  Positions a point at the girth distance from the starting point along the curve
of the first plate system (such as the hull), and then at a distance from the girth
point along the normal to the curve. The starting point is at the intersection of
the first plate system, the second plate system, and the sketching plane. The curve
of the first plate system is at the intersection between the first plate system and
the sketching plane.
At girth then along normal options
Girth Distance
Defines the girth (see ) distance along the first plate system curve.
Normal Distance
Defines the linear distance normal to the first plate system curve.
Intersection
Defines the axis direction for the intersection point, when the first plate system,
second plate system, and sketching plane intersect in more than one location. Select
+x, x, +y, y, +z, or z. For example, a hull, deck, and transverse sketching plane intersect on the port
and starboard sides. Select +y to use the starboard side starting point or y to use the port side starting point.
Girth
Defines the axis direction used to orient the girth distance measurement.
Normal
Defines the axis direction used to orient the normal distance measurement.
At intersection of offset curves options
Offset 1 Distance
Defines the linear distance along the first plate system curve offset.
Offset 2 Distance
Defines the linear distance along the second plate system curve offset.
Intersection
Defines the axis direction for the intersection point, when the first plate system,
second plate system, and sketching plane intersect in more than one location. Select
+x, x, +y, y, +z, or z. For example, a hull, deck, and transverse sketching plane intersect on the port
and starboard sides. Select +y to use the starboard side starting point or y to use the port side starting point.
Offset 1
Defines the axis direction used to orient the first offset measurement.
Offset 2
Defines the axis direction used to orient the second offset measurement.
Point at Offset From Key Point
KeyPoint
Specifies a key point by index number. Every crosssection has 27 key points, although
some are combined for crosssections with simple geometry. For more information, see
Key Points.
Select Value in the 3D Graphic View
Allows key point selection in the graphic view. Key points display as preview geometry,
key point numbers, and the local uv coordinate system. For more information, see
Key Points.
U Offset
Specifies the offset of the geometric construction point from the key point along
the local uaxis of the crosssection.
V Offset
Specifies the offset of the geometric construction point from the key point along
the local vaxis of the crosssection.
Polyline by 1 to 4 Segments
Auto Preview
Displays a preview of the polyline in the graphic view.
Segments Count
Specifies the number of segments to use to create the polyline.
Category
Specifies the method of segment creation.
Surface by Corrugation
Auto Preview
Displays a preview of the corrugated surface in the graphic view.
Category
Specifies a category of corrugation parameters.
Corrugated surfaces have the following parameters:

1  Start extension
2  Start clearance
3  End position
4  End extension
5  Flush up
6  Flush bottom
7  Reference plane

Surface by Sweeping
1
Select the planar crosssection curves that form the boundaries of the surface. These
planar curves can be open or closed. They must be oriented in the same direction to
avoid the bowtie effect.
(2)
Optionally, select path curves. These curves do not have to be planar. They do not
have to touch the planar curves selected in 1.

1  Crosssection Curves
2  Path Curves

Surface by Skinning
1
Select the base curve or base point for the surface.
2
Select the offset curves for the surface. These curves can be open or closed. The
curves must be oriented in the same direction to avoid the bowtie effect.

1  Base Point
2  Offset Curve


1  Base Curve
2  Offset Curve

Max dev angle
Specifies the angle in a surface at which a knuckle is created.