A UCS allows data that is not aligned neatly to North, to be given a false origin and X axis to re-align the data to be square to the screen.
UCS's can also be defined in a DWG and imported at the same time as the DWG. If any are found during the import process a message box will be displayed asking if the user also wants to import, and apply them to the CAD data as well.
To define or see the current state of any UCS click on the UCS option under the View Menu\Home Tab in a CAD or Model view.
If no UCS has been defined, then the UCS dialog will look like this below.
WCS in the case above refers to the World Coordinate System, which is really just the normal coordinate system with the standard origin and rotation such that North is up the screen and East is perpendicular to the right.
In the case of the example below, note the grid is currently square to the screen, but the rectangle and arcs inside it are not. In order to define a UCS such that the Rectangle will be square to the screen click Create.
Using the Lock modes, indicate a new Origin and then the direction for the positive X-Axis. Finally, the user will be asked to provide a name for the new UCS.
Having created the UCS, the final question asks if it should be applied.
Here the UCS origin was set to be the bottom left corner of the rectangle, whilst the X-Axis was set to be the lower right corner. When the screen redraws, it now looks like this.
The UCS dialog reflects this by showing the Test UCS to be current with a green tick.
Note that if any other data sources are backclothed whilst this current CAD model has a UCS applied. Then unless the "Apply UCS to Backcloth Models" is checked, then the two datasets will not line up anymore.
To switch between UCS's just select the appropriate entry and click Apply,
To remove a UCS permanently, select it and click Delete.
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