Shows a rotation manipulator on the selected objects or components.
If this option is turned on, dragging the area inside the rotation manipulators (the center) rotates the object or component. If this option is turned off, you can only rotate the object or component by dragging directly on the rotation manipulators, also allowing you to select objects or components by clicking in the area bounded by the rotation manipulators.
This is useful when you want to add to a component selection. With Center as virtual trackball off, you can immediately add to the component selection even if the component is within the area bounded by the rotation manipulators. Otherwise, you would have to change manipulators to the Select Tool, shift-select to make your selection, and choose the Rotate Tool again.
Changing the rotation order and axis orientation
In the Transform Attributes section of an object’s Attribute Editor, you can change the rotation order of the axes by selecting an order from the Rotate Order pop-up menu. You can also enter values in the Rotate Axis X, Y, or Z boxes to rotate the axes in a specific direction, and to rotate the object around a different axis.
Keep in mind that these attributes have a combined effect with the Rotate Mode settings in the rotate Tool Settings.