AutoCAD 2008 User's
Guide > Control the Drawing
Views > Change
Views > Control the 3D
Projection Style >

Define a 3D View with Coordinate Values or Angles

You can define a viewing direction by entering the coordinate values of a point or the measures of two angles of rotation.

WORLDVIEW system
variable. The conventions for defining standard views differ
between architectural (AEC) and mechanical design. In AEC design,
the perpendicular view of the *XY* plane is the
top or plan view; in mechanical design, the perpendicular view of
the *XY* plane is the front view.

DDVPOINT.
The following illustration shows a view defined by two angles
relative to the *X* axis and the *XY* plane of the WCS.