2013

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You then rotate the objects freely by dragging outside the gizmo. You can also
specify an axis about which to constrain the rotation.
If you want to realign the center of rotation, you can relocate the gizmo by
using the Relocate Gizmo option on the shortcut menu.
Constrain the Rotation to an Axis
You can constrain the rotation to a specified axis. As you move the cursor
over the rotation paths on the 3D rotate gizmo, a vector line representing the
axis of rotation is displayed. Specify an axis of rotation by clicking the rotation
path when it turns yellow.
When you drag the cursor, the selected objects and subobjects rotate about
the base point along the specified axis. The gizmo displays the degree of
rotation from the original position of the object as the object moves. You can
click or enter a value to specify the angle of the rotation.
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