3D Curves

Extract border curve

	3D curves toolbar
	Modify menu > 3D curves > Extract border curve

This function is used to generate 3D NURBS curves from surface borders.
The following queries appear after activating this function.

Please select definition
Click on the surface. It is then coloured magenta.

Please click on the border curve in the 3D view (enter = End)
Now identify the desired surface border by clicking on it. The selected curve is displayed in yellow.

This curve?
If the yellow curve is the desired curve, confirm the query with "Y"  Enter .
However, if the yellow curve is not the desired curve, respond to the query with "N"  Enter . In this case, the first query appears again.

Please click on the border curve in the 3D view (enter = End)
Now you can click on another surface. However, this surface must border the current border curve (displayed in yellow). If this is not the case, the following message appears: Curves are not connected and the query Please click on the border curve in the 3D view (enter = End) appears again.

Press  Enter  to end the selection. A NURBS curve and a 2D model that corresponds to the projection for this curve in the work plane are then produced.

Workshop

Extract border curve
First, draw a trans surface. The exact description can be found in the workshop DEFINE TRANS SURFACE.

Select the EXTRACT BORDER CURVE function
Please select definition

Click on the surface.
Please click on the border curve in the 3D view (enter = End)

Click near the upper curve K1.
This curve?

Confirm with  Enter .
Please click on the border curve in the 3D view (enter = End)

Repeat the process again with curve K2.
The new 3D curve is now available for other 3D functions.

Fillet curve

Modify menu > 3D curves > Fillet

After selecting the 3D curve, you will be asked for a manipulation point. For the point specified here, the next point positioned on the curve is searched for, which either corresponds to a point or is assigned to a fillet. In the case of a point, a fillet can be defined; if a fillet already exists, the existing radius can be changed (radius 0 means a corner is restored).

Tip

To better define the manipulation point, it is recommended to capture points on the curve.

Example:
3D curve with corners	Filleted 3D curve

Connect curve

	3D curves toolbar
	Modify menu > 3D curves > Connect

Several 3D curves that follow on from each other can be connected into one single curve, if the curves adjoin each other. To do this, select the curves one after each other using this function and complete the selection with  Enter .

Split curve

	3D curves toolbar
	Modify menu > 3D curves > Split

After selecting the 3D curve, you will be asked for a partition point. For the point specified here, the next point positioned on the curve is identified as the actual partition point, and the curve is split there. The splitting operation results in two-part curves that are each assigned to a model.

Tip

To better define the partition point, it is recommended to capture points on the curve.

Delete single curve

	3D curves toolbar
	Modify menu > 3D curves > Delete single curve

You can use this function to delete single 3D or section curves. Start the function and then click on the desired curve. It is then deleted.