2004

230 | Chapter 15 Use Precision Tools
Assign User Coordinate System Orientations to
Viewports
Multiple viewports provide different views of your model. For example, you
might set up viewports that display top, front, right side, and isometric
views. To facilitate editing objects in different views, you can define a differ-
ent UCS for each view. Each time you make a viewport current, you can begin
drawing using the same UCS you used the last time that viewport was
current.
The UCS in each viewport is controlled by the
UCSVP system variable. When
UCSVP is set to 1 in a viewport, the UCS last used in that viewport is saved
with the viewport and is restored when the viewport is made current again.
When
UCSVP is set to 0 in a viewport, its UCS is always the same as the UCS
in the current viewport.
For example, you might set up three viewports: a top view, front view, and
isometric view. If you set the UCSVP system variable to 0 in the isometric
viewport, you can use the Top UCS in both the top viewport and the
isometric viewport. When you make the top viewport current, the isometric
viewport’s UCS reflects the UCS top viewport. Likewise, making the front
viewport current switches the isometric viewport’s UCS to match that of the
front viewport.
The example is illustrated in the following figures. The first figure shows the
isometric viewport reflecting the UCS of the upper-left, or top, viewport,
which is current.
UCSVP = 0; UCS icon reflects
UCS of current viewport
top viewport is current