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Tweek: Merging 2D and 3D Interaction in Immersive Environments

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Map abilities of specific devices to interaction. Typically use 3D ... We do not want to re-invent scrollbars, menus, etc. Avoid cluttering immersive space ... – PowerPoint PPT presentation

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Title: Tweek: Merging 2D and 3D Interaction in Immersive Environments


1
Tweek Merging 2D and 3D Interaction in Immersive
Environments
  • Patrick Hartling
  • Allen Bierbaum
  • Carolina Cruz-Neira

2
Overview
  • Problem description
  • Goals for Tweek software
  • Design overview
  • Implementation overview
  • Future work

3
Problem Description
  • Interaction in VR is primarily 3D
  • Not all interactions map well to this method
  • Alphanumeric input
  • Fine-grained interaction
  • List selection
  • Per-application custom interfaces
  • Map abilities of specific devices to interaction
  • Typically use 3D input devices
  • Why abandon effective 2D interaction techniques
    in 3D space?

4
Tweek
  • Framework for the development of cross-platform,
    cross-language, scalable GUIs
  • GUIs communicate with remote applications
  • GUIs can be use on the desktop, on a PDA, or in
    an immersive VR environment
  • Part of the VR Juggler project
  • Open source software for virtual reality
  • Cross-VR system virtual platform for the
    development of VR applications
  • http//www.vrjuggler.org/

5
Goals
  • Allow GUI scalability
  • Same GUI runs on the desktop, a PDA, and a
    projection-based VR system
  • Must provide an easily extendable framework for
    cross-platform, cross-device GUIs
  • Interact with VR applications written in any
    programming language
  • Fully separate the GUI from the application
  • Reuse existing GUI technology
  • We do not want to re-invent scrollbars, menus,
    etc.
  • Avoid cluttering immersive space

6
Design Overview (1 of 2)
  • Observer design pattern
  • VR application is the subject
  • Maintains user-defined state information
  • Per-application customizations
  • GUI is the observer
  • Provides a view of subjects state
  • GUI interactions manipulate application state
  • Benefits
  • Distinct separation of application and GUI
  • Allows multiple GUIs to observe the same
    application

7
Design Overview (2 of 2)
  • Two-way communication between application and GUI
  • Application can send data to the GUI
  • GUI flexibility
  • A GUI can load any component it needs to make
    interaction more effective
  • Not limited to direct manipulation of application
    state

8
Implementation Overview
  • Combination of technologies
  • C for VR applications
  • Java for GUI
  • Basic Java framework
  • Dynamically loaded JavaBeans for GUI components
  • CORBA 2.3 for inter-language communication
  • XML for JavaBean descriptions

9
Current Uses of Tweek (1 of 2)
  • Interaction mechanism for military training
    application
  • VCR-like controls for playback of pre-recorded
    session
  • 6DOF navigation
  • Entity data read-outs
  • VR Juggler 2.0 configuration editor VrjConfig
  • Makes extensive use of JavaBeans
  • Remote reconfiguration of running VR Juggler
    applications

10
Current Uses of Tweek (2 of 2)
  • Network data routing monitor PlxView
  • Part of Plexus, the basis for VR Juggler 2.0
    collaboration software
  • Provides multiple features
  • View of the network
  • Manipulation of network connections
  • Charting of live network metrics
  • Control of simulated network

11
Tweek in Use
12
Future Work
  • Security
  • Take advantage of CORBA security capabilities
    (SSL, TCP wrappers)
  • Authentication is necessary
  • Push GUI components to Java GUI from C
    application
  • Applications give the GUI to the users
  • Part of design but not fully implemented
  • Interaction through web pages
  • Make use of Java applets
  • Incorporate a Python component

13
More Information
  • Websites
  • http//www.vrjuggler.org/tweek/
  • http//www.sf.net/projects/vrjuggler/
  • Mailing lists
  • vrjuggler-info_at_lists.sourceforge.net
  • vrjuggler-devel_at_lists.sourceforge.net
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