3D Compositing with Action > Action: Masks > Manipulating Vertices and Tangents >
Breaking Tangents

You can separate two tangent handles (break the tangent) and move them separately using the Break option from the Edit Mode box:

- To break and move a tangent handle, select Break (B) and click the tangent handle. The tangent is displayed as a dashed line, indicating it is "broken."
- To reconnect two broken tangent handles, click the vertex or select Auto (U) and click either of the two tangent handles. The tangent is displayed as a solid line.
- To change the position of an individual tangent handle after releasing the cursor, select Move (M).

In the Vertices tab, use the fields in the Tangents section to change the length and angle for the incoming and outgoing tangent handles. If the tangents do not combine to form a straight line, the tangents will be broken and displayed as a broken line.