Use the MEASURE_DISTANCE operation to display information about the relative position of any two surface control points.
Click the icon and then click on any control point in one of the orthogonal views.
Then move the mouse to any other control point and click on it. While moving from the first control point to the second, the mouse drags a dotted line. After the second control point is clicked, the Edit Text Data field displays the distance between the two points and there relative x, y and z offsets.
The MEASURE_DISTANCE mode is disabled automatically after clicking on the second point.
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