2004

858 | Glossary
viewpoint The location in 3D model space from which you are viewing a model. See
also view and viewport. (DVIEW, VPOINT)
viewport A bounded area that displays some portion of the model space of a draw-
ing. The TILEMODE system variable determines the type of viewport created. 1. When
TILEMODE is off (0), viewports are objects that can be moved and resized on a layout.
(MVIEW) 2. When TILEMODE is on (1), the entire drawing area is divided into non-
overlapping model viewports. See also TILEMODE, view, and viewpoint. (VPORTS)
viewport configuration A named collection of model viewports that can be saved
and restored. (VPORTS)
virtual screen display The area in which AutoCAD can pan and zoom without
regenerating the drawing.
volumetric shadows A photorealistically rendered volume of space cast by the
shadow of an object.
WCS See world coordinate system (WCS).
window selection A rectangular area specified in the drawing area to select multiple
objects at the same time. See also crossing selection, polygon window selection.
wipeout object A polygonal area that masks underlying objects with the current
background color. This area is bounded by the wipeout frame, which you can turn on
for editing and turn off for plotting.
wireframe model The representation of an object using lines and curves to represent
its boundaries.
working drawing A drawing for manufacturing or building purposes.
working set A group of objects selected for in-place reference editing.
world coordinates Coordinates expressed in relation to the world coordinate system
(WCS).
world coordinate system (WCS) A coordinate system used as the basis for defining
all objects and other coordinate systems. See also user coordinate system (UCS).
xref See external reference (xref).
X,Y,Z point filters See coordinate filters.
zoom To reduce or increase the apparent magnification of the drawing area. (ZOOM)
WCS icon