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Survey Hardware (how they work) Virtual Reality (VR) hardware Input Devices Output Devices Virtual Reality System input device - measures and records physical phenomena electronically, creating digital signals that the computer understands

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survey

Survey

Hardware (how they work)

virtual reality vr hardware
Virtual Reality (VR) hardware
  • Input Devices
  • Output Devices
  • Virtual Reality System
  • input device - measures and records physical phenomena electronically, creating digital signals that the computer understands
  • output device - changes electronic signals into physical phenomena and provide sensible data 
  • virtual reality system - follows software instructions in assembling, processing and displaying all the data involved in creating a virtual world in real-time
vr input devices
VR Input Devices

Forceball

  • ball mounted on small, stationary platform
  • twist, squeeze, press down, pull up, and turn side to side
  • uses LEDs and photoreceptors inside the base to measure force

Flying mouse

  • similar to mouse
  • becomes 6DOF sensor when lifted off the desktop
  • electromagnetic sensors built-in

Dataglove

  • captures relative movement of fingers, thumb and wrist
  • allows the hand to grasp, move, or interact with virtual objects
  • includes position sensor

Wand

  • similar to a flying mouse
  • lacks mouse ball
  • contains position-tracking sensor and designed to be held upright 
  • six degrees of freedom(6DOF)
  • 2DOF devices - measure movements along the X and Y axes
  • 6DOF devices - measure movements along the X, Y, Z axes AND orientation of an object
  • Examples of 6DOF devices - flying mouse, wand, forceball and dataglove
vr display devices
VR Display Devices

3-D Glasses

  • uses a red and blue colored lens

to combine into stereoscopic

Head-Mounted Displays (HMDs)

  • with head-tracking devices
  • LCD shutter glasses are synchronized to two alternating separate views of the same scene
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Survey

World Builders & Authoring Tools

what is an authoring tool
What is an authoring tool?
  • An authoring tool is a tool to help you in building something, in this case, a VR world
  • There are a lot of authoring tools out there and one of the most common tool used and found is the Notepad (or any other text editor)
other authoring tools
Other Authoring Tools
  • Any 3D modeler (that may or may not support exporting to VRML 97 format)
    • Example : 3D Studio Max, Lightwave Studio, Maya
  • World builders that are specific to VRML
    • Example : Cortona, Interactive VRML World Builder
advantages vs disadvantages
Advantages vs. Disadvantages
  • Text Editor
    • Advantages :
      • Able to have full control over the model
      • Building sleek and slim codes
      • Gain better knowledge and port it to world builders
    • Disadvantages :
      • Long coding times for large worlds
      • Human typo errors
advantages vs disadvantages10
Advantages vs. Disadvantages
  • Generic 3D Modelers
    • Advantages :
      • Wide variety of built in tools
      • More comprehensive then most world builders
    • Disadvantages :
      • Not optimised for web development
advantages vs disadvantages11
Advantages vs. Disadvantages
  • VRML World Builders
    • Advantages :
      • Optimised for web
      • Most are able to port to the web which can be viewed directly (to HTML format)
    • Disadvantages :
      • Not very comprehensive
      • Sometimes might generate errors which are hard to debug
how does it work
How does it work?
  • Records down all vertices and positions of all objects in the scene
  • Records down other info like material and lighting
  • File uses .wrl extension
  • Other formats can be converted to VRML 97 format by using 3rd party softwares
future of authoring tools
Future of Authoring Tools
  • X3D-Edit is a new tool for Extensible 3D Graphics (Virtual Reality is one of it)
  • X3D-Edit uses XML tagset defined by the X3D Compact Document Type Definition (DTD) in combination with Sun's Java, IBM's Xeena XML editor, and an editor profile configuration file
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Survey

Virtual Reality Programming, scripting, etc

programming tools libraries
Programming Tools & Libraries
  • OpenGL
    • Needs no introduction
  • DirectGraphics
    • A component of DirectX
    • Only works on Windows
  • Java3D
    • Java-based
    • Less mature than DirectX and OpenGL
programming tools libraries16
Programming Tools & Libraries
  • CAVE
    • Full-fledged projection-based VR system
    • CAVE library is the SDK
  • GHOST SDK
    • Toolkit for developing touch-enabled applications.
programming tools libraries17
Programming Tools & Libraries
  • VR Juggler
    • Library used as framework for app development
    • Controls rendering, VR devices, projection, etc.
    • Not a visual development environment.
slide18

Programming Tools & Libraries

  • Java (2) SDK v 1.3
    • standard tool used
    • automatic installation
    • java3D as an extension to libraries
  • MS Visual J++
    • has to be hacked into to enable java3D
    • might cause a problem
slide19

Programming Tools & Libraries

  • Activate - VRML2 Toolkit for C/C++ Developers
    • allow adding VRML97 files into MS Windows products
    • needs a C++ compiler
  • VIPER: The NIST VRML97 Parser
    • analyses and checks for error in VRML97 files
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Survey

Agent & Avatars Technology

avatars
AVATARS
  • An image representing a user in a multi-user virtual reality space.
  • Creature in a virtual reality world that has been endowed with life and may interact with each other.
  • Used for training, simulation, public speaking and cyber conference.
intelligent agents
INTELLIGENT AGENTS
  • A virtual being capable of carrying out a task towards a goal while requesting and receiving advice in human terms.
  • Used mainly for data mining such as in www.google.com and databases of companies.