Extrapolating Curves

Click Extrapolate in the Operations toolbar.

The Extrapolate Definition dialog box appears.

In the Boundary box, select an endpoint on a curve.

In the Extrapolated box, select the curve to be extrapolated.

It can be a wire, an edge, a curve or a line.

Select the extrapolation Type from the list:

• Length: enter the value in the Length box or use the graphical manipulators in the 3D geometry.

  Warning: It is not advised to enter a negative value in the Length box.

  Important: In Curvature mode, the length is the distance of wire obtained through tangent extrapolation relimited by the plane created at the given length from the chosen extremity. This plane is used to split the extrapolated curve.

• Up to : the Up to box is enabled. Select an element belonging to the same support as the curve to be extrapolated (curve, surface or plane).

  Warning: The element must intersect the curve to be extrapolated.

In the Continuity list, select any of the option:

• Tangent: the extrapolation side is tangent to the curve at the selected endpoint.
• Curvature: the extrapolation side complies with the curvature of the selected curve.

Length extrapolation in Tangent mode

Length extrapolation in Curvature mode

Up to extrapolation in Tangent mode

If needed and if the initial curve lies on a plane or surface, you can select this support. In this case the extrapolated curve lies on the surface too, and is relimited by the support boundary.

Extrapolation without support

Extrapolation with a support

Click OK to create the extrapolated curve.

The curve (identified as Extrapol.xxx) is added to the specification tree.