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Curve CreationThe curve creation is strongly related to the shape generation. A curve is a line element in the three-dimensional space that does not influence the simulation by itself.The main purpose of the curve generation is to provide flexible tools for the creation of more complex three-dimensional solid shapes. The following page will give you a basic overview of the available tools. Please refer to the specific manual pages for details.Curves Each curve item is assigned to a curve that is shown in the Curves folder in the navigation tree. The purpose of curves is to group together a collection of curve items such that these items can be used together in subsequent operations. A curve is considered closed if its items form a closed loop. Basic curve creation The easiest way to create a curve item is to define a curve item "primitive." The following table shows the toolbar items and the menu commands.
To generate such a primitive you will first need to select the appropriate menu or toolbar item. This will lead you to an interactive curve item generation mode where you can define the curve items’ parameters by using the mouse (while in this mode, press F1 for more information). After you have finished all necessary steps (or pressed the ESC key) a curve item parameter dialog box will open showing a summary of all parameters for this curve item. Within this dialog box, you can change the parameters and finally create the curve item. After the curve item has been created it will appear in the navigation tree under it’s curve folder. Blend and chamfer curve items Common modifications of curve items are given
by the application of chamfers
or blends
at its vertices. The corresponding tools can be activated by choosing
Modeling:
Curves Delete curve segments Each curve item may consist of several curve
item segments (e.g., a rectangle consists of four line segments, a simple
circle consists of one segment only). The operation delete
curve segments allows you to delete each of these segments individually
without affecting the others. After invoking this command by choosing
Modeling:
Curves Trim curves A trim
curve operation works similar to the boolean operations on solids.
The purpose of this operation is to trim one curve item with another one,
e.g., to produce arc segments by trimming a full circle with a line. The
trim curve operation is a very important tool for creating more complex
curves. As soon as the operation is invoked by selecting Modeling:
Curves Cover planar curve A closed planar curve (all curve items are located
in the same plane) can be covered
with a planar surface. This operation generates a face from a closed chain
of curve items and is invoked by selecting Modeling:
Curves Extrude planar curve This operation works similar to the cover
operation and is invoked by choosing Modeling:
Curves Sweep curve along path For the generation of more complex shapes, it
is often useful to sweep
a cross section profile along a path. The profile and the path need to
be specified as two separate curves where each of these curves may either
be open or closed. If the profile is a closed curve, the resulting shape
will be a valid solid shape. Otherwise, the resulting shape will be an
infinitely thin sheet body. This operation is invoked by choosing Modeling:
Curves Loft between curves The loft curves operation (invoked by selecting
Modeling:
Curves Trace from curve Closed and open planar curves can be traced.
The width and thickness of the new shape can be specified in a dialog
box. Optionally, on open curves, the end caps can be modelled as round.
This operation is invoked by choosing
Modeling:
Curves Local coordinate systems Besides the ability to create the curve items along the axes of the global x/y/z coordinate system, it is also possible to define local coordinate systems or working coordinate systems (WCS). The usage of these coordinate systems allows the generation of curve elements with an arbitrary orientation in space. Furthermore, the local coordinates allow the construction of new model elements based on the picked locations (e.g. faces and points) of already existing ones. See also
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Curves
)
or 
).
Then, an interactive mode will be entered to select the point at which
the chamfer or blend will be applied afterwards.
), an interactive mode will be entered in which curve
segments can be selected for deletion.
), an interactive mode is entered in which the two curve items
for the trim operation have to first be selected. Afterwards, segments
of the intersected curves can be chosen that will then be deleted from
the resulting curve items.
). The resulting face is an infinitely thin sheet and does not
influence the simulation.
). The difference is that the 
).
)) is the most powerful method for creating a solid shape from
a set of curves. The 
). 
