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Rotate mode :
With this mode it's possible to rotate the point of view.
Command access
From navigation tool bar .
From the "View" menu.
Usage of the rotate mode

To rotate, press the left mousse button. A circle represent the rotation sphere and two arcs with a close hand represent the sphere grip place. Drag the mousse pointer to rotate.

When the desire point of view is reach, release the mousse button.

When the pointer is on sphere circle limit the rotation axis pass throw view center and point of view.