The command x3dsave saves the graphical scene as a file in X3D format. If filename is omitted, a dialog for specifying the name and location will appear. If the suffix .x3d is not included in filename, it will be added automatically. X3D viewers and browser plugins are available for some platforms. However, this format is relatively new and continues to evolve (see limitations).
See also: pdbrun, save, write, exporting a scene, raytracing with POV-Ray