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Appendix
Application outline: a representation of the lines of
program used to create a virtual world application. [indentions
indicate nested activities]:
[Based on WorldToolKit, a virtual worlds creation program
developed by Sense8 Corp. It consists of a simulation manager and
a library of over 250 functions that support interfacing to many
of the common VR devices.] (Pimentel & Teixeira, 100-102)
- Load stationary world (file containing backdrop)
- Load object(s) (files containing each of the
independent objects to be manipulated; includes 3-D)
- Create sensors (establish communication links with
sensor devices)
- Initialize sound (establish communication links with
sound devices)
- Attach sensors to viewpoint
- Initialize viewpoint (place viewpoint at reasonable
starting point)
- Start simulation
- Query sensors (establish current orientations)
- Update objects
- User action (this is where the unique features of
the application will reside--the actions that the user may take.)
- Animate object (once every cycle the current image is
replaced with the next one in the sequence)
- Control sound (based on changes in viewpoint)
- Test control device (see if it has been activated)
- Move object (activate all the interactive dynamics
necessary if an object is moved)
- End user action (return control to the simulation
manager)
- Object tasks (checks positions etc. if an object has
been assigned a task; e.g., a door is supposed to open.)
- Render (internal program function that assembles all
the information about the state of the universe and renders the
left and right eye views appropriately. The video signal is
converted to an NTSC format and fed to the HMD)
- Loop (go back to query sensors)
- End simulation
(To return to beginning, please click here.)