Maya places vertices
on the ground plane unless you snap them to existing geometry.
Click to place the next vertex. Maya
creates an edge between the first point and the last point you placed.
Place another vertex. A dashed edge connects
the three vertices.
Do any of the following:
Press to finish
the polygon.
Press to delete
the last point you placed.
Press y to start a new polygon.
Continue placing vertices to create a
quad or n-sided polygon.
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.