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Computer Aided Design

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TechTalk about different 3D technologies and there use in CAD Systems

TechTalk about different 3D technologies and there use in CAD Systems


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  • 1. Raytracing and the usage in Computer Aided Design-programs
    1
    University of Business, Design and Technology - English
  • 2. Table of Contents
    Basics
    OpenGL
    general description and functionality
    Constructive solid geometry (CSG)
    Raytracing
    global lighting model
    Raytracing importance for CAD
    CAD modeling
    Implementation of render technologies
    Generative Modeling Language for architectural Design
    CAD as basis for generative manufacturing method using the example of product design
    2
    University of Business, Design and Technology - English
  • 3. Basics
    OpenGL
    general description and functionality
    Constructive Solid Geometry (CSG)
    Raytracing
    global lighting model
    Raytracing importance for CAD
    3
    University of Business, Design and Technology - English
  • 4. general description and functionality
    2-divided render pipeline
    vertex operations -> form surfaces of objects
    pixel operations -> operations to give pixels a color value
    post processing
    result is displayed by frame buffer
    4
    University of Business, Design and Technology - English
    Pixel operations (AA,HDR etc.)
    vertex operations
  • 5. Constructive Solid Geometry
    High-Level Graphics API
    simplify computer graphics because many computations are done automatically by CSG
    used to build complex objects/structures
    good interaction with Raytracing algorithms
    5
    University of Business, Design and Technology - English
    simple example
    complex example
    Photo of a raytraced CSG image
  • 6. Basics
    OpenGL
    general description and functionality
    Constructive Solid Geometry (CSG)
    Raytracing
    global lighting model
    Raytracing importance for CAD
    6
    University of Business, Design and Technology - English
  • 7. global lighting model
    local lighting models: material computation for every single object
    global lighting models: computation of the whole scene
    computation complexity makes real-time raytracing (nearly) impossible
    7
    University of Business, Design and Technology - English
    Gouraud Shading
  • 8. global lighting model
    algorithm functionality
    8
    University of Business, Design and Technology - English
  • 9. Raytracing importance for CAD
    most realistic illustration of graphical models
    large scalability
    point of interest of current research -> large number of good programs
    9
    University of Business, Design and Technology - English
    big city rendering
    raytraced model of Porsche Carrera GT2
  • 10. CAD modeling
    Implementation of render technologies for CAD
    Generative Modeling Language for architectural design
    CAD as basis for generative manufacturing method using the example of product design
    10
    University of Business, Design and Technology - English
  • 11. Implementation of render technologies for CAD
    Basics are OpenGL SL and CSG API
    Main focus is an easy user interface and simple-named facility possibilities
    limitation of functions and primitives, concerning special aspects of usage
    Example: shearing of objects and complex NURBS not necessary for architecture because building this is impossible
    11
    University of Business, Design and Technology - English
  • 12. CAD modeling
    Implementation of render technologies for CAD
    Generative Modeling Language for architectural design
    CAD as basis for generative manufacturing method using the example of product design
    12
    University of Business, Design and Technology - English
  • 13. Generative Modeling Language for architectural design
    • New method: storage of mathematical functions instead of vertex primitives
    • 14. scene consists of sequentially computed formulae instead of a collection of objects
    • 15. fast and easy generation of highly complex structures
    • 16. Advantages:
    • 17. highly scalable
    • 18. fast
    • 19. high level of detail
    • 20. Very smooth impression of generated structures
    • 21. Disadvantages:
    • 22. rather complex style programming
    • 23. cryptic language
    13
    University of Business, Design and Technology - English
  • 24. Generative Modeling Language for architectural design
    University of Business, Design and Technology - English
    14
    GML model of the cologne cathedral
  • 25. Generative Modeling Language for architectural design
    procedural model of a metropolis
    University of Business, Design and Technology - English
    15
    procedural model
    of pompeii
  • 26. Generative Modeling Language for architectural design
    another big aspect in architecture: lighting
    with the help of raytracing, very accurate 3D models possible
    16
    University of Business, Design and Technology - English
    Picture of an Exhibition with Relux
    Outside-to-Inside-View with AVE
    exterior view of a buildbing, made with AVE
  • 27. CAD modeling
    Implementation of render technologies for CAD
    Generative Modeling Language for architectural design
    CAD as basis for generative manufacturing method using the example of product design
    17
    University of Business, Design and Technology - English
  • 28. CAD as basis for generative manufacturing method using the example of product design
    displaying problem of complex forms
    rather contradictory aims in visualization
    CADs for product design are compromises and collections of many technologies
    18
    University of Business, Design and Technology - English
  • 29. CAD as basis for generative manufacturing method using the example of product design
    example of industrial design: car design and development
    19
    University of Business, Design and Technology - English
    3D model of Lamborghini LP640, done with Maya
    raytraced model of a Porsche Carrera GT2, done with 3ds max
  • 30. CAD as basis for generative manufacturing method using the example of product design
    example for product design: a ball pen as an item for mass production
    20
    University of Business, Design and Technology - English
    The design of a ball pen, created by Katja Albrecht (student of product design at HS Wismar)
  • 31. Bibliography
    • Pictures:
    • 32. lighting in Relux: ezzatbaroudi.wordpress.com
    • 33. cars: open test renderings from some forums
    • 34. AVE renderings: http://www.vrvis.at/rendering/applications/architecture/?sid=-48f9cfd4
    • 35. procedural modeling results: www.digitalurban.blogspot.com
    • 36. GML pictures of the cologne cathedral: result of Sven Havemann‘s theses (TU Braunschweig)
    • 37. raytracing illustration, shading models, vertex example & render pipeline: wikipedia
    • 38. HDR Image OpenGL: Futuremark 3D
    • 39. Information:
    • 40. www.wikipedia.de
    • 41. www.generative-modeling.org
    • 42. www.opengl.org
    • 43. http://www.autodesk.com/techpubs/aliasstudio/2009/
    • 44. various scripts of german and international universities/ facilities of higher education
    • 45. www.cgal.com
    • 46. http://gts.sourceforge.net
    • 47. http://opencsg.org/
    • 48. http://www.solidgraphics.com/
    21
    University of Business, Design and Technology - English