Extrude an edge
Extend boundary edges and create connecting faces along the extrusion.
Before you start
Use Edge Select in mesh edit mode and select an open boundary edge or a simple connected boundary chain. Extending a boundary creates faces between the old and new edge positions.
Use the operation
Grow an open surface from its boundary.
- Inspect the selected boundary and make sure it is the side of the surface you want to extend.
- Choose Extrude from the edge context menu and move the new boundary.
- Confirm a modest extension and inspect the new strip of faces.
- Continue shaping the new boundary with component transforms if the strip needs to taper or turn.
Controls and choices
| Controls | What changes |
|---|---|
| Boundary chain | Defines the length of the new face strip. Disconnected selected edges create separate strips. |
| Direction and distance | Control the extension from the existing boundary. Avoid moving the strip through the original surface. |
Try it in your scene
Select an open boundary edge, extrude it, and inspect the new face and its normal direction.
Check the result
Inspect face orientation and connections at the ends. Extruding an interior edge can add unwanted overlapping or branching surface geometry. If a closed volume is required, inspect and close the remaining open boundaries separately.
Practice in Show3D
Open the editor and follow the steps with your own scene.