Fill a boundary
Create a face from a closed boundary. The boundary vertices stay fixed; the opening gains a surface.
Before you start
Enter Edit Mode. Select the vertices or edges around the opening you want to close; a simple, approximately planar boundary is a useful starting point.
Use the operation
Create a missing face across a boundary, or create an edge between two vertices.
- Switch to Vertex or Edge Select and select the intended boundary. Check that hidden or distant components are not included.
- Press F or choose Fill from the selection’s context menu.
- Inspect the new face from both sides. For a large or concave face, add deliberate internal edges if later deformation needs them.
Controls and choices
| Controls | What changes |
|---|---|
| Two vertices | A two-vertex selection can create an edge. A surface requires a suitable boundary with at least three corners. |
| One opening | Fill closes a boundary. Use Bridge Edge Loops when the goal is to connect two openings. |
| Face shape | A filled n-gon is not automatically a regular quad grid. Non-planar or concave outlines need closer inspection. |
See what changes
Before
An open boundary
After
A filled face
Check the result
Confirm the opening is closed without a second overlapping face. Inspect shading and normals, then use Connect or Triangulate if the face needs explicit internal topology.
Practice in Show3D
Open the editor and follow the steps with your own scene.