When you navigate a 3D model, you can use the realism tools on the Viewpoint tab 
Navigate panel to control the speed and realism of your navigation. The realism tools are not available in a 2D workspace.
When you navigate a 3D model, you can use the realism tools on the Viewpoint tab Navigate panel to control the speed and realism of your navigation. The realism tools are not available in a 2D workspace.