Rotate geometry by moving mouse inside viewer window and drag while left
   mouse button is pressed. Usually, rotation is the default mode in the viewer.
   Press right mouse button to select major interaction mode from popup menu,
   or use keyboard keys to temporarily switch between different modes (just keep
   a button pressed to switch mode temporarily):
        
         
            | o | 
            Rotate surface (initial mode for perspective
               camera) similar to a space ball. Orbit
               mode. | 
         
         
            | v | 
            Rotate surface with fixed Vertical axis. | 
         
         
            | s | 
            Scale
               surface, drag in vertical direction. | 
         
         
            | t | 
            Translate
               surface in xy-plane (initial mode for orthogonal
               cameras). | 
         
         
            | z | 
            Translate
               surface in z-direction | 
         
         
            | c | 
            Center
               camera on object (object is centered and not scaled). | 
         
         
            | f | 
            Focus
               camera on object (object is centered and scaled). | 
         
         
            | x | 
            Drag a rectangle
					to be eXpanded to fill display. Or
					pick a new center without expanding. | 
         
         
            | r | 
            Reset
               camera and viewer, geometry returns to default position. | 
         
         
            | Left Mouse | 
            Depending on the mode, drag, pick and
               select the geometry in the viewer. | 
         
         
            | Middle Mouse | 
            Drag to translate geometry. | 
         
         
            | Right Mouse | 
            Drag to scale scene, or click to show popup menu to select major modes. | 
         
      
        
         
            | a | 
            Add
               additional vertex to geometry. New vertices will become invisible unless showing of vertices is enabled. | 
         
         
            | e | 
            Add element or polygon
            by picking existing or new vertices. | 
         
         
            | d | 
            Duplicate all visible geometries of a scene by reflection
            at a point, a line, or a plane. The point, line or plane must previously been determined by marking one, two, or three
            vertices of the current geometry. | 
         
         
            | i | 
            Initial
               pick, e.g. used drag initial points on surfaces by several applets. | 
         
         
            | m | 
            Drag a rectangle
               to Mark all enclosed vertices. | 
         
         
            | n | 
            Drag a rectangle
               to mark all touched elements. | 
         
         
            | p | 
            Pick a
               vertex and drag it. To see picked vertex enable display of 
               vertices in menu Inspector->Object->Material of
               control panel, 
               picked vertices are magenta). | 
         
         
            | u | 
            Drag a rectangle
               to Unmark all enclosed vertices. | 
         
         
            | Shift-u | 
            Drag a rectangle
               to Unmark all enclosed elements. | 
         
      
        
         
            | Shift-a | 
            Toggle display of edge aura around edge in line drawing mode. | 
         
         
            | Shift-b | 
            Toggle display of bounding box around current geometry. | 
         
         
            | Shift-c | 
            Toggle display of center of geometry (pending). | 
         
         
            | Shift-d | 
            Toggle usage of depthcueing to fade off far away items. | 
         
         
            | Shift-f | 
            Toggle display of small coordinate frame. | 
         
         
            | Shift-g | 
            Toggle display of xy-grid. | 
         
         
            | Shift-h | 
            Toggle display of information at mouse tip. | 
         
         
            | Shift-i | 
            Toggle display of background image. | 
         
         
            | Shift-j | 
            Toggle usage of lights. | 
         
         
            | Shift-l | 
            Toggle display of border around display. | 
         
         
            | Shift-m | 
            Toggle magnet mode of vertices, i.e. highlight if nearby vertices. | 
         
         
            | Shift-o | 
            Direct select mode, geometries are automatically selected when picked. | 
         
         
            | Shift-p | 
            Toggle usage of painters algorithm. Since v4.0 z-buffer is default mode. | 
         
         
            | Shift-q | 
            Toggle display of display title information. | 
         
         
            | Shift-r | 
            Toggle display of copyright information. | 
         
         
            | Shift-s | 
            Toggle anti-aliased rendering. | 
         
         
            | Shift-t | 
            Toggle tag mode to move all marked vertices. | 
         
         
            | Shift-v | 
            Toggle fast z-buffer mode (requires z-buffer mode). | 
         
         
            | Shift-x | 
            Toggle display of coordinate axes. | 
         
         
            | Shift-y | 
            Toggle accelerated but less accurate z-buffer mode. | 
         
         
            | Shift-z | 
            Toggle z-buffer mode. Since v4.0 z-buffer is default mode. | 
         
      
        
         
            | F1 | 
            Show help resp. shortcut information. | 
         
         
            | F2 | 
            Close control window. | 
         
         
            | Ctrl-a or F4 | 
            Show Animation
               panel to steer animations. | 
         
         
            | Ctrl-b | 
            Show Label inspector. | 
         
         
            | Ctrl-d | 
            Info panel of Display inspector. | 
         
         
            | Ctrl-e | 
            Show Vector field inspector. | 
         
         
            | Ctrl-f | 
            Show Configuration inspector
            if geometry depends on parameters. | 
         
         
            | Ctrl-g | 
            Inspect ggraphics at Camera inspector. | 
         
         
            | Ctrl-h or F3 | 
            Show console window with Debug information. | 
         
         
            | Ctrl-i | 
            Show Info
               panel of current geometry if available. | 
         
         
            | Ctrl-p | 
            Show info panel of current Pjroject if available. | 
         
         
            | Ctrl-l | 
            Show Light
               panel of current display. | 
         
         
            | Ctrl-m | 
            Show Material
               panel of current geometry if available. | 
         
         
            | Ctrl-t | 
            Show Texture panel of geometry if available. | 
         
         
             | 
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