In CFD-Post, the 3D Viewer is accessible by clicking the 3D Viewer tab at the bottom of the panel on the right side of the interface.
After loading a results file into CFD-Post, you can see a visual representation of the geometry in the 3D Viewer. You can create various other objects that can be viewed in the 3D Viewer. For details, see CFD-Post Insert Menu.
Descriptions of the various viewing modes and 3D Viewer commands, including toolbars, shortcut menus, and hotkeys, are given in 3D Viewer Modes and Commands.
You can switch between four adjustable "views" that each remember the camera angle and state of visibility of all objects. CFD-Post has "figures", which are similar to views except that they can be included in reports. For details, see Views and Figures.