Starts the interactive 3D view and makes objects appear closer or farther away.
When the command is active, the cursor appears as a line with one arrow pointing up and another pointing down. Clicking and dragging in the current viewport moves the position of the camera for the current view closer or farther away from the objects. Drag upward to move the camera closer to the objects, making them appear larger; drag downward to move the camera away from the objects, making them appear smaller.