Add polygons to an existing mesh

User Guide > Modeling > Polygonal Modeling > Polygon selection and creation > Polygon creation >

You can add polygons to an existing polygon mesh using the Append to Polygon Tool. The Append to Polygon Tool creates the new polygon using an edge as a starting point.

To add a connected polygon to an existing mesh

Select the polygon you want to append to.
Select Edit Mesh > Append to Polygon Tool.
The border edges highlight and appear thicker.
Click the border edge you want to append to.
The edge you select is the first edge of the new face. Arrows indicate the edge direction.
Click to place a vertex for the new polygon. You can also click another border edge to use it in the new polygon.
A new vertex appears with a line connecting it to the last point of the selected face edge.
Do any of the following:
- Continue placing vertices or selecting edges.
- To remove the last vertex you placed, press .
- To switch to editing vertices, press Home or Insert. A manipulator appears on the previous vertex. Use the manipulator to move the vertex, press Delete to delete a segment, or click another vertex to edit it. Press Home or Insert again to finish.
- Press to finish the polygon.
- Press Y to start a new polygon.
  NoteThe Append to Polygon Tool will not let you append to a non-boundary face.
  If you want to append a face to a single non-boundary edge, use Edit Mesh > Extrude, then modify the new face as desired.