Hints for Using Cortona from ParallelGraphics
To change the quality of the resolution of the image, right click on the image and select "Preferences", then select "Renderer" The R98 Renderer generally provides the best image, although the navigation is slower and not as smooth as with the other renderers.The "Fly" button will move the viewer into the image. The "Walk" button will move the viewer over the image at a constant 'altitude'. The "Study" button will allow the viewer to spin or rotate the image. If the viewer becomes lost, click on the "Restore" button.
More detail on using Cortona can be found in the Help file that is installed with Cortona. This may be accessed through the Start -> Programs -> ParallelGraphics menu.