1 / 57

Developing a VR System

Developing a VR System. Mei Yii Lim. System Development Life Cycle - Spiral Model. Problem definition Preliminary study System Analysis and Design System Development System Testing System Evaluation Refinement. Case Study: MY Virtual Graffiti System. Introduction.

daryl
Download Presentation

Developing a VR System

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Developing a VR System Mei Yii Lim

  2. System Development Life Cycle - Spiral Model • Problem definition • Preliminary study • System Analysis and Design • System Development • System Testing • System Evaluation • Refinement

  3. Case Study: MY Virtual Graffiti System

  4. Introduction • ‘graffiti’ - Greek word ‘graphein’ • Modern graffiti - New York, tagging using water resistant marker • Today - using aerosol spray • Rude, humorous, political or constituting vandalism and are generally illegal

  5. Problem Objectives • What do you aim to achieve? • Solution to the problem of illegality • Preserves and documents art works • Virtual spray on virtual buildings • Flexibility and natural interaction • Realistic reproduction of the spray • User-friendly and intuitive interface

  6. CAVE

  7. Problem Definition

  8. Problem Definition • Define the problem you are trying to solve • What are the major issues?

  9. Project Benefits • What are the benefits of the project? • Why is it so important? • Expression of opinions, creativity lawfully • Coping with society’s problems • London councils - £13m and graffiti committee - £100m spent annually on cleaning up graffiti • New type of art, uncover hidden talent

  10. Project Management • Project scheduling • Divides work into smaller chunks - Gantt Chart • Risk Analysis • Degree of uncertainty or potential problems • Eg. lack of knowledge , inappropriate or difficult to use interaction devices, simulation algorithm, underestimation of time

  11. Project Management continued… • Risk Planning • Best way for project with users as target - involve them • Trial and error • Project schedule must be realistic

  12. Preliminary Study

  13. Literature Review • Find out the state-of-the-art • Who has done what • What can be improve • What should be avoided

  14. Literature Review of MYVG • Eschler & Stricker 03 (Fraunhofer IGD) • projection filled totally by a 2D wall • Dave Pape - ‘Vandalism’ • alter existing artworks, 3D paintings and sculptures • Lang • Virtual Graffiti Painter and Light bombing • MobSpray (mobile application) • http://www.mobspray.com/indexphp

  15. System Analysis

  16. System Analysis • Understand the requirements of the system you are going to develop • Determine ‘what’ is to be accomplished • To ensure successful system development • Human Computer Interaction concepts

  17. Rapid Iterative Prototyping • Offers the best approach for system which accurate requirements can not be defined at its early stage • Prototype – a mechanism for identifying the actual requirements • Iterative and corrective cycle

  18. Rapid Prototyping Development Cycle

  19. Requirements Elicitation • Fact-gathering – active manipulation of conditions or passive observation of people • Researching and reviewing existing documents • Individual interviews • Mailing list • Observation – demonstration from experts • Questionaires - evaluation

  20. Analysis with Justification • Every choice must be justified • Why a particular device or methodology is chosen and not the others?

  21. Analysis Result of the MYVG system

  22. MY Virtual Graffiti System • CAVE Environment • Graffiti using VR technologies • 2 sensor gloves (pinch gloves) sensors

  23. Space Orb 360º (6 degree of freedom) Stereo glasses Tracking system Dummy spray can with sensor MY Virtual Graffiti System

  24. Use cases – scenarios of usage Analysis model – subsystems of the end product Object-Oriented Model

  25. System Requirements Specification • Hardware requirements • Software requirements • Functionality description • Non-functional requirements • Interface specification • Design constraints • System validation and verification criteria

  26. System Design

  27. System Design • How to accomplish the proposed functionality? • How are all the VR devices linked together? • Representation of the system

  28. Architectural Design • UML class diagrams - shows all available classes

  29. Architectural Design … • Object-relationship model – static model, reflects the object classes and their relationship

  30. Architectural Design … • State diagram – dynamic model • Describes the behavior of the system, events

  31. Architectural Design … • Sequence diagram – illustrate each significant interaction between objects

  32. Algorithm Design • Pseudocode – description of the program • Example – a method to create scene METHOD createScene char*(filename) returns pfScene* Generate scene state Add lighting Set traversal mask Load file RETURN scene END

  33. Scenegraph

  34. User Interface Design • A useful system with a poor user interface = non-functional system • HCI golden rules • Know the user population • Reduce cognitive load • Engineer for errors • Maintain consistency and clarity

  35. WELCOME TO VIRTUAL GRAFFITI ! SPRAY MODE BUTTON A / LEFT PINKIE CLEAR BUTTON B SAVE BUTTON C / LEFT MIDDLE NAVIGATE BUTTON D, PS / RIGHT INDEX RESET BUTTON E EXIT BUTTON F CLOSE MENU RIGHT PINKIE

  36. SPRAYING MODE SPRAYING RIGHT MIDDLE COLOUR LEFT MIDDLE NOZZLE LEFT RING MAIN MENU LEFT PINKIE NAVIGATE RIGHT INDEX CLEAR RIGHT RING / BUTTON B CLOSE MENU RIGHT PINKIE

  37. Denote the size of the nozzle Denote the color of the nozzle 3D icon that appears while spraying S

  38. System Development and Testing

  39. System Development • Programming • Example of Challenges • Format incompatibility • Incorrect hit points Correct Ray Bounding Plane A box

  40. Single ray Multiple rays Number of rays

  41. System Testing • Tedious but essential for quality assurance • Formal technical review • Unit testing • Integration testing

  42. Risk Monitoring • Throughout the whole life cycle to ensure that everything is under control • Users’ opinions were checked • Project progress was monitored

  43. System Implementation and Evaluation

  44. System Implementation • Putting the system into operation • Prototyping approach – implementation is parallel with the development and testing phases

  45. System Evaluation • Acquire feedback for eventual improvement • Formative evaluation – usability evaluation • Can be repetitive • Each evaluation process serves as guide for changes in subsequent iterations

  46. Example – Initial Evaluation • Half a dozen subjects

  47. Refinement • Menu shift and simplification • User manual was provided • More flexible interaction – Space Orb or pinch gloves • Dummy spray can • Allow deactivation of menu • Bigger paint particles for wider coverage

More Related