Extend Surfaces

Use the Surfaces: Extend tool to create tangent or normal extension surfaces.

New surfaces are organized in the same component as the surface being extended.
  1. From the Geometry ribbon, click the Surfaces > Extend tool.


    Figure 1.
  2. Select edge(s).
  3. Click an arrow to switch between creating a tangent or normal extension surface.
    If an edge has multiple adjacent surfaces, use Tab to cycle between them.
  4. Optional: Select one or both of the extend options in the microdialog.
    • Click to maintain edge angles.
    • Click to auto-trim intersecting surfaces.
  5. Extend surfaces in the following ways:
    • Enter a length in the microdialog and press Enter.
    • Drag the arrow in the modeling window.
Tip: Constrain line drag to one direction, then use snap points to extend surfaces by distances relative to existing geometry, even if the reference points are not on the same plane as the surface being extended.