2013

Table Of Contents
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.
ObjectARX (AutoCAD Runtime Extension)
A compiled-language programming environment for developing custom
applications.
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.
opacity map
Projection of opaque and transparent areas onto objects, creating the effect
of a solid surface with holes or gaps.
origin
The point where coordinate axes intersect. For example, the origin of a
Cartesian coordinate system is where the X, Y, and Z axes meet at 0,0,0.
orthogonal
Having perpendicular slopes or tangents at the point of intersection.
Ortho mode
A setting that limits pointing device input to horizontal or vertical (relative
to the current snap angle and the user coordinate system). See also snap angle
and user coordinate system (UCS).
778 | Glossary