2012

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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.
512 | Chapter 8 Work with 3D Models