2011

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Because you specify the start point and end point of the split, this method
also gives you control over the shape of the two new faces. Use the Vertex
option to snap automatically to the vertices of the face. If you plan to split a
face to createand then spin the edge oftwo triangular faces (MESHSPIN),
use the Vertex option to ensure precision.
Extrude Mesh Faces
You can add definition to a 3D object by extruding a mesh face. Extruding
other types of objects creates a separate 3D solid object. However extruding
a mesh face extends, or deforms, the existing object and subdivides the
extruded face.
You can use the same methods for extrusion of the faces of 3D solids and
meshes as you use for other types of objects. For example, you can specify an
extrusion direction, a path, or a taper angle. However, when you extrude mesh
faces, the MESHEXTRUDE command provides an option that sets whether
adjacent faces are extruded individually or whether their shared edges remained
joined.
Modify Mesh Faces | 623