Using a Semantic Edge

You can use an intersection edge or a tangent intersection edge from a 3D part as an input for a projection, or an offset operation in Sketcher.

Note: For this scenario, you will use the intersection edge for projection operation, but you can use it in the offset operation too. Only difference between the projection and the offset operation is that in offset, a dashed curve is displayed simulating the offset when you select an intersection edge.

This task shows you how to:

Project an Intersection Edge
Project a Tangent Intersection Edge

Before you begin: Create a 3D shape having an intersection between the two faces.

Project an Intersection Edge

You can project an intersection edge onto the sketch plane.

To access the App Options panel, from the Tools section of the action bar, select App Options .

In the App Options panel, click Intersection Edges activation .
From the Sketch section of the action bar, click Project 3D Elements.
The Projection dialog box appears.
In the Element(s) to project box, select an edge to be projected as the reference element.

If an edge is preselected, the selection is taken as a reference element and the behavior is similar as shown above.

If you select the same edge again in the work area, the selection is automatically removed from the Element(s) to project box.
Click OK.
An intersection edge is projected onto the sketch plane.

If the selected edge is resulting from an intersection, an intersection edge corresponding to the whole intersection is projected onto the sketch plane. Otherwise, the initial selected edge is taken into account for the projection.

Project a Tangent Intersection Edge

You can project a tangent intersection onto the sketch plane.

In the App Options panel, click Tangent Intersection Edges activation .
From the Sketch section of the action bar, click Project 3D Elements.
The Projection dialog box appears.
In the Element(s) to project box, select an edge to be projected as the reference element.
Click OK.
A tangent intersection edge is projected onto the sketch plane.

If the selected edge is resulting from an intersection, the propagation of the selection to the whole intersection is stopped where continuity in tangency is interrupted. In this case, a tangent intersection edge corresponding to the tangency propagation is projected onto the sketch plane.
When the selected edge is not the result of an intersection, the initial selected edge is taken into account to propagate the selection in tangency and create a tangent edge as input for the projection.