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the world coordinate system unless you change the 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.
You can rotate a view using DDVPOINT. The following illustration shows a
view defined by two angles relative to the X axis and the XY plane of the WCS.
To set a view with a viewpoint coordinate
1 Click View menu ➤ 3D Views ➤ Viewpoint.
2 Click inside the compass to specify the viewpoint. The selected viewpoint
is used to view the drawing in the direction of 0,0,0.
To set a view with two angles of rotation
1 Click View menu ➤ 3D Views ➤ Viewpoint.
2 Enter r (Rotate) to specify a new direction using two angles.
3 Enter an angle in the XY plane measured from the positive X axis.
4 Enter an angle from the XY plane that represents your position while
viewing the model in the direction of 0,0,0.
To set standard views with VPOINT (AEC convention)
1 Click View menu ➤ 3D Views ➤ Viewpoint.
2 Enter a coordinate according to the viewpoint you want:
■ Enter 0,0,1 for a top (plan) view.
■ Enter 0,-1,0 for a front view.
258 | Chapter 9 Change Views