# Intersection

Project (or convert) the intersection of a surface or face and the active sketch plane onto the sketch plane.

This functionality is available on Onshape's browser, iOS, and Android platforms.

In the Sketch toolbar:

Project (or convert) the intersection of a surface or face and the active sketch plane onto the sketch plane.

## Steps

- Create a sketch using an intersecting plane as the sketch plane.
- Select from the Use dropdown menu.
- Select the surface or face with which to create the new sketch.

The resulting sketch seen with the part, below.

## Tips

- The sketch updates when the underlying geometry changes.
- The sketch is constrained with the Intersection and Pierce constraints where the sketch intersects the plane or surface/face of the original model.

Project (or convert) the intersection of a surface or face and the active sketch plane onto the sketch plane.

## Steps

- Create a sketch using an intersecting plane as the sketch plane.
- Select Intersect.
- Select the surface or face with which to create the new sketch.

The resulting sketch seen with the part, below.

## Tips

- The sketch updates when the underlying geometry changes.
- The sketch is constrained with the Intersection constraint, and the Pierce constraint where the sketch intersects the plane or surface/face of the original model.

## Steps

- Create a sketch using an intersecting plane as the sketch plane.
- Select Intersect.
- Select the surface or face with which to create the new sketch.

The resulting sketch seen with the part, below.

## Tips

- The sketch updates when the underlying geometry changes.
- The sketch is constrained with the Intersection constraint, and the Pierce constraint where the sketch intersects the plane or surface/face of the original model.

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