2012

Table Of Contents
navigation bar Navigation tools that are common across multiple Autodesk
programs. The unified navigation tools include Autodesk
®
ViewCube
®
,
SteeringWheels
®
, ShowMotion
®
, and 3Dconnexion
®
.
node An object snap specification to locate points, dimension definition
points, and dimension text origins.
non-associative dimension A dimension that does not automatically change
as the associated geometry is modified. Controlled by the DIMASSOC system
variable. See also associative dimension and exploded dimension.
normal A normal is a vector that defines which way a face is pointing. The
direction of the normal indicates the front, or outer surface of the face.
noun-verb selection Selecting an object first and then performing an operation
on it rather than entering a command first and then selecting the object.
NURBS For nonuniform rational B-spline curve. A B-spline curve or surface defined
by a series of weighted control points and one or more knot vectors. See also
B-spline curve.
NURBS surface Surfaces that are have control vertices in the U and V
directions. NURBS surfaces cannot be associative. See also procedural surface
and generic surface.
object One or more graphical elements, such as text, dimensions, lines, circles,
or polylines, treated as a single element for creation, manipulation, and
modification. Formerly called entity.
object enabler A tool that provides specific viewing and standard editing
access to a custom object when the ObjectARX application that created the
custom object is not present. See also custom object and proxy object.
Object Snap mode Methods for selecting commonly needed points on an
object while you create or edit a drawing. See also running object snap and
object snap override.
object snap override Turning off or changing a running Object Snap mode
for input of a single point. See also Object Snap mode and running object snap.
ObjectARX (AutoCAD Runtime Extension) A compiled-language
programming environment for developing AutoCAD applications.
OLE For object linking and embedding. An information-sharing method in which
data from a source document can be linked to or embedded in a destination
document. Selecting the data in the destination document opens the source
application so that the data can be edited. See also embed and link.
2310 | Glossary