Extrude
Move the selected face outward and connect it to the existing boundary with new side faces. The original base stays fixed.
Before you start
Select an editable mesh, enter Mesh Edit, and choose Face Select. Select the face or connected face region that should extend. Start with a simple region so you can inspect the new side walls.
Use the operation
Extend a face into a connected volume.
- Open the face context menu and choose Extrude, or press E with the modeling viewport focused.
- Move the new selection to give the extrusion a visible length. Extrude starts a topology change and a move together.
- Choose Extrude Along Normals when the selected surface should offset along its normals rather than move as one translated region.
- Confirm the result, then inspect the connection to the original mesh from another view.
Controls and choices
| Controls | What changes |
|---|---|
| Selected region | Determines which faces extend and which edges form the extrusion boundary. |
| Movement direction | Controls the extension. A negative move can push the new region into the source. |
| Along normals | Offsets selected geometry according to surface normals; inspect corners on a curved or uneven region. |
See what changes
Before
Select a face
After
Extend the surface
Check the result
Look for connected side faces, unintended internal overlap, and a consistent wall shape. If the tool appears to do nothing, check selection mode and whether the new region still overlaps its start. Use Undo to remove an unwanted extrusion before repeating it.
Practice in Show3D
Open the editor and follow the steps with your own scene.