The 3-D View panel is located in the center of the Simulation window and displays the geometry surfaces, computational mesh, and/or boundary definitions, as well a spark and spray location information. As described below, you can move or rotate the geometry and zoom in or out, using your mouse. The Visibility tree on the right-hand side of the 3-D View panel, or right-clicking in the Workflow tree, allows selection / de-selection of different items in the 3-D View.