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Multiresolution View-Dependent Splat Based Volume Rendering of Large Irregular Data

Multiresolution View-Dependent Splat Based Volume Rendering of Large Irregular Data. Jeremy Meredith, Lawrence Livermore National Laboratory Kwan-Liu Ma, University of California, Davis. Multi-res View-Dependent Splatting. Highlights: Visualize very large irregular data interactively Pro:

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Multiresolution View-Dependent Splat Based Volume Rendering of Large Irregular Data

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  1. Multiresolution View-Dependent Splat Based Volume Rendering of Large Irregular Data Jeremy Meredith, Lawrence Livermore National Laboratory Kwan-Liu Ma, University of California, Davis

  2. Multi-res View-Dependent Splatting • Highlights: • Visualize very large irregular data interactively • Pro: • Multi-res: hierarchical oct-tree • View-dependent • Splatting • Con: • Oct-tree add much overhead to store volume data

  3. Multi-resolution • Hierarchical oct-tree

  4. Splatting • Integral of emitted light at each point on image plane

  5. Splatting • Low-Albedo Optical Model • The amount of emitted light received at location x at the image plane • Use Taylor approximation • Here, If If(x) is the amount of light at location x in the frame buffer, and αnew(x), Inew(x) are the new incoming opacities and light intensities, respectively • OpenGL blending function • glBlendFunc(GL SRC ALPHA,GL ONE MINUS SRC ALPHA)

  6. EVL Internal Volume Visualization Workshop Charles Zhang EVL, UIC

  7. Our Goals • Very large data • Difficulties: WAN, beyond local RAM, interactivity • Is multi-res necessary? • Pro: fast access, exploration convenient, scalability, pre-fetch compatible • Con: a pre-processing must • Which mutli-res: wavelet? • Is view-dependence necessary? • Pro: no redundant data fetch, easy pre-fetching, good for stereo-display(?) • Con: overhead? • Parallel Volume Rendering • Image-ordering or object ordering? • IO: accurate • OO: fast, suitable for view-dependence • Sort-first or sort-last • Sort-first uses less bandwidth

  8. Our Goals (cont’d) • Interactivity • Fast overview? • Multi-res, view-dependent? • Fast view point change? • Tolerance is high when view moving fast. • Distributed / Parallel Computing • Distributed data on WAN? • Is the data scalable, what’s the limit for our viz tools • Load-balancing on rendering cluster • Multi-tile display • The display is scalable?

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