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Stereoscopy for Non-Planar Projections (TRUE 3D 2009)
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Stereoscopy for Non-Planar Projections (TRUE 3D 2009)

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  • IBA360 degreecylindricalprojectionRendererusinganaglyphstereoimagingAntennas: samplingartifactsProblem: noomni-directionalstereopossible
  • Anotherinstanceof passive stereoscopyischromo-stereoscopy.
  • Sphericalprojection[CLICK]
  • Therearedifferencesofapplyingchromo-stereoscopytoto IBA and GBA.Whilethecolormappingcanbeapplieddirectlytotheresults
  • Thisworks alsousing different colorramps – thatcanbeswitchedatruntimeA problemthatyoucansee in thisvideo: thedistributionofcolors – canlacks[CLICK]
  • Wehavetofacesomecommonproblemswhenapplyingchromo-stereoscopyto 3D geovirtualenvironments
  • Transcript

    • 1. Enhancing Interactive Non-Planar Projections of 3D Geovirtual Environments with Stereoscopic Imaging
      Matthias Trapp, Haik Lorenz, Markus Jobst, Jürgen Döllner
      Hasso-Plattner-Institute at the University of Potsdam
      True-3D in Cartography
      1st International Conference on 3D MapsAugust 24 - 28, 2009 Dresden, Germany
      1
    • 2. motivation
      geo-media technology
      provides interactivity, immersion
      facilitatesthecommunication of 3D geospatialdata
      applications to cartography:
      increase immersion into 3D geovirtual environments
      support for depth-cues
      planar stereoscopy:
      well understood – rendering: straight forward
      supported by graphics hardware / driver
      non-planar stereoscopy:
      provides high field-of-view and image resolution
      2
    • 3. problem: non-planar projection surfaces
      rendering of digital 3D city and landscape models:
      high amount of geometry and texture data
      real-time constraints (> 20 frames per second)
      current generation of graphics hardware (GPU)
      no native support for non-planar projection surfaces
      requires specific rendering techniques
      classified into image, geometry, and ray-based approaches
      hardware-accelerated stereoscopic imaging:
      available stereo hardware modifies vertex pipeline stage
      cannot be used for rendering non-planar stereoscopy
      3
    • 4. framework - conceptual overview
      4
    • 5. review: image-based approach (IBA)
      basic concept:
      dynamic cube map + screen-aligned quad
      image warping based on normal vectors:
      3-phase rendering process:
      create/update dynamic cubemap
      setup projection shader
      render screen-aligned quad
      5
    • 6. adapting IBA for stereoscopy
      basic idea for image-based non-planar projections:
      create cubemaps for each virtual camera
      derive non-planar projection for each cube-map
      examplary workflow for two stereo mates:
      6
    • 7. review: geometry-based approach (GBA)
      projection computed on a per-vertex basis
      ensure sufficient on-screen vertex density
      dynamic mesh refinement required
      7
    • 8. adapting GBA for stereoscopy
      straight forward approach:
      setup piece-wise projection for each virtual camera
      render into different color-buffers
      additional post-processing step: layer compositing
      example for stereo image pairs:
      8
    • 9. rendering active & passive stereo
      active stereo:
      using quad-buffering
      usually encapsulated by graphics driver
      passive stereo:
      anaglyph: color-buffer compositing
      polarized: render to framebuffer
      chromo-depth stereo: apply directly during rendering
      9
    • 10. rendering passive anaglyph - results
      HITIT
      10
    • 11. rendering chromo-stereoscopy
      no need for generating stereo image pair
      color as a function of depth
      11
    • 12. rendering chromo-stereoscopy - results
      HITIT
      12
    • 13. applying chromo-stereoscopy
      GBA: straight forward application to fragment‘s depth
      IBA: needs depth correction
      13
    • 14. renderingchromo-stereoscopy - results
      HITIT
      14
    • 15. chroma-stereoscopy issues
      common problems for IBA and GBA:
      distribution of color can decrease stereo effect
      perception: facade information (texture) is altered
      interaction: focal plane must be adapted
      15
    • 16. binarycomparision GBA vs. IBA
      16
    • 17. conclusions & future work
      conclusions:
      interactive stereoscopic rendering for non-planar projections
      increases immersion, thus psychological depth cues
      performance limited by geometric complexity of the scene
      GBA outperforms IBA but IBA much easier to implement/use
      open problem:
      omni-directional stereo without image artifacts
      future work:
      auto stereoscopy for non-planar projections surfaces
      eye tracking to adjust user‘s focal plane
      17
    • 18. Thank you for your attention! Questions?
      Contact
      Matthias Trapp
      matthias.trapp@hpi.uni-potsdam.de
      Haik Lorenzhaik-lorenz@hpi.uni-potsdam.de
      Markus Jobst
      office@jobstmedia.at
      JürgenDöllner
      juergen.doellner@hpi.uni-potsdam.de
      Workgroup 3D Geoinformation
      www.3dgi.de/
      Computergraphics System Group
      www.hpi.uni-potsdam.de/doellner/
      18