2011

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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.
The second figure shows the change that occurs when the lower-left, or front,
viewport is made current. The UCS in the isometric viewport is updated to
reflect the UCS of the front viewport.
220 | Chapter 16 Use Precision Tools