2011

Table Of Contents
System Variables
BACKZ
Stores the back clipping plane offset from the target plane for the current
viewport, in drawing units.
FRONTZ
Stores the front clipping plane offset from the target plane for the current
viewport, in drawing units.
LENSLENGTH
Stores the length of the lens (in millimeters) used in perspective viewing.
TARGET
Stores the location (as a UCS coordinate) of the target point for the current
viewport.
VIEWDIR
Stores the viewing direction in the current viewport, expressed in UCS
coordinates.
VIEWMODE
Stores the View mode for the current viewport.
VIEWTWIST
Stores the view rotation angle for the current viewport measured relative to
the WCS.
WORLDVIEW
Define a Perspective Projection (DVIEW)
Perspective projections require a distance between a theoretical camera and
a target point. Small distances produce severe perspective effects; large distances
produce milder effects.
A perspective view remains in effect until the perspective effect is turned off
or until a new view is defined in its place.
To define a perspective view of a 3D model using DVIEW
1 At the Command prompt, enter dview.
2 Select the objects to display.
248 | Chapter 10 Change Views