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Dynamic Mapping of Raster Data (IV 2009)

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Dynamic Mapping of Raster Data (IV 2009)

  1. 1. Dynamic Mapping of Raster-Data For 3D Geovirtual Environments Matthias Trapp , Jürgen Döllner Hasso-Plattner-Institute, University of Potsdam, Germany 13 th International Conference on Information Visualisation 14-17 July
  2. 2. motivation <ul><li>Using 3D geovirtual environments as scenery for visualization of dynamic geo-referenced thematic data </li></ul>
  3. 3. motivation <ul><li>Using 3D geovirtual environments as scenery for visualization of dynamic geo-referenced thematic data </li></ul>Preprocessing Time: days-hours Preprocessing Time: hours-minutes Preprocessing Time: minutes
  4. 4. wrap-up: challenges & goals <ul><li>Strong coupling of geometry and appearance: </li></ul><ul><ul><li>Real-time rendering constraints </li></ul></ul><ul><ul><li>Large-scale data sets require specific out-of-core renderer </li></ul></ul><ul><ul><li>Results in (time-consuming) data pre-processing </li></ul></ul><ul><li> Cannot be used to visualize time-critical data </li></ul><ul><li>Goals: </li></ul><ul><ul><li>partially decoupling geometry and appearance to… </li></ul></ul><ul><ul><li>… enable dynamic multi-texture mapping </li></ul></ul><ul><ul><li>… enable color transfer function </li></ul></ul><ul><ul><li>… for a large number of mapping configurations </li></ul></ul><ul><ul><li>… in real-time </li></ul></ul>
  5. 5. overview: dynamic texture mapping <ul><li>Given input data: </li></ul><ul><ul><li>3D point (fragment) of original model </li></ul></ul><ul><ul><li>Data & color layers </li></ul></ul><ul><ul><li>Mapping parameterizations </li></ul></ul><ul><li>Requested: final color </li></ul><ul><li>Data & color layers: </li></ul><ul><ul><li>1D/2D/3D image/textures </li></ul></ul><ul><ul><li>data values, masks </li></ul></ul><ul><ul><li>color gradients </li></ul></ul>
  6. 6. texture coordinate generation <ul><li>Projective texture mapping [Everitt 2001] </li></ul><ul><li>Orthogonal projection matrix: </li></ul>U V
  7. 7. color transfer functions <ul><li>Describes color mapping of data values </li></ul><ul><li>Define blending equations between mappings </li></ul>
  8. 8. rendering at a glance <ul><li>Extending OpenGL/DirectX multi-texturing pipeline </li></ul><ul><li>Single-pass rendering: </li></ul><ul><ul><li>Per-fragment dynamic texturing using shader programs </li></ul></ul><ul><ul><li>GPU Data representation: texture arrays </li></ul></ul><ul><ul><li>Projective mappings encoded in texture-buffers </li></ul></ul><ul><li>Performance evaluation: </li></ul>#Vertex #Mappings FPS without FPS with FPS loss (%) 1,040,503 3 10.41 9.87 5.19 41,032 4 52.88 51.20 3.18 61,756 27 156.10 27.94 82.10 6 4 1063.83 236.97 77.72 37,404 16 206.21 45.70 77.84 6 6 1075.27 110.54 89.72
  9. 9. application examples <ul><li>Hierarchical combination of raster data layers </li></ul>Building category data Traffic frequency data Data Layer: Color Layer: Data Layer: Color Layer:
  10. 11. application examples <ul><li>Object or route highlighting </li></ul>Landmark objects Landmark objects Route
  11. 13. application examples <ul><li>Projective symbols to facilitate the design of interactive 3D digital maps </li></ul>
  12. 14. application examples <ul><li>Focus + context visualization: 2D magic lenses </li></ul>
  13. 15. conclusions <ul><li>Summary: </li></ul><ul><ul><li>Extendable concept for dynamically mapping 2D raster-data </li></ul></ul><ul><ul><li>Approach based on projective texture mapping </li></ul></ul><ul><ul><li>Fully-hardware accelerated implementation </li></ul></ul><ul><li>Limitations: </li></ul><ul><ul><li>Works only for 3D GeoVE that can be approximated by a plane </li></ul></ul><ul><ul><li>Limited texture resolution </li></ul></ul><ul><li>Future Work </li></ul><ul><ul><li>Extend color transfer to style transfer functions </li></ul></ul>
  14. 16. thank you... Contact: Matthias Trapp [email_address] Jürgen Döllner [email_address] Computer Graphics System Group www.hpi.uni-potsdam.de/3d Researchgroup 3D-Geoinformation www.3dgi.de

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