Autodesk 235B1-05A761-1301 - AutoCAD MEP 2010, User Manual, Page: 678 / 878

Rectangular Creates a profile based on a rectangle defined by 4 lines, 4 points, and 4 perpendicular constraints
to maintain its shape.
Oval Creates a profile based on an oval defined by 2 lines, 2 arcs, 4 points, and 4 tangent constraints to
maintain its shape.
Custom Creates a profile from existing geometry in the model. The geometry must be attached to a single
work plane. Constraints are assigned as needed to maintain the shape of the geometry as it was selected.
Modifiers
After creating profiles, you can apply modifiers to create 3-dimensional (3D) features of the model. A modifier
is a general term for any operation that affects features of the model. You can use modifiers to extrude, add,
or subtract features and to sweep a profile along a path. You can also use modifiers to create cut planes and
transition features.
Content Builder provides 6 types of modifiers: extrusion, path, transition, cut plane, Boolean add, and
Boolean subtract. The extrusion modifier is the most common type used in part modeling and is generally
the base feature for a model. When you extrude a profile to create a feature, you specify how the feature will
modify the shape by choosing 1 of 4 operations: midplane, plane, from-to, or blind.
Midplane Extrusion Modifier
A midplane extrusion uses a profile as the center of the extrusion and sweeps the profile an equal distance
away from each side of the center.
Applying a midplane extrusion modifier
Plane Extrusion Modifier
A plane extrusion sweeps a profile between the profile itself and a specified work plane. If the work plane is
a reference work plane, the extrusion is updated when the work plane is moved.
Applying a plane extrusion modifier
From-To Extrusion Modifier
A from-to extrusion sweeps a profile between 2 work planes.
660 | Chapter 14 Customizing Catalog-Based Content