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             Techniques of Perception in VRML97 
              by n_polys 08_2001 
            Existential Perception  
            What can I do in this world? What is my relation
            to this environment? 
            
              -  NavigationInfo:
                AvatarSize, Headlight, visibilityLimit, type, speed
                
 
              -  Timesensor: cycleInterval
                 
 
              - Background: colors
                and textures give a context for the environment 
 
             
            There is also a binding stack which changes
            the active node for NavInfo and Background.It is recommended
            to limit user movement through both the binding of various navigation
            types and the use of invisible walls and barriers to keep users from
            getting lost or sidetracked. 
             
             
             
            Existential
            Example: slow  
            Existential
            Example: speedy  
             
             
            
            
              
                | When you go to the Columned Grove, clicking
                  on the different objects will take you from Alice in Wonderland
                  to Kubrick to Camus. | 
               
             
              
            
             
            note: In order to efficiently acheive
              Einsteinian Relativity in simulation, we would really like to have
              the Timesensor cycleInterval field be an exposedField so scripts
              and interpolators can dynamically drive the world or clock time...
              maybe in X3D? 
             
             
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