Use the Center tool to define the center of the current view of a model.
To define the center, drag the cursor over your model. A sphere (pivot point) is displayed in addition to the cursor. The sphere indicates that the point below the cursor in the model will be the center of the current view when you release the mouse button. The model is centered on the sphere.
A sphere (pivot point) is displayed in addition to the cursor. When you release the mouse button, the center of the current view is at the location of the sphere.