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Advanced volume rendering on shadows, flows and high-dimensional rendering

Zhang, Caixia
http://rave.ohiolink.edu/etdc/view?acc_num=osu1143150322

Abstract Details

2006, Doctor of Philosophy, Ohio State University, Computer and Information Science.
Although many advances have been achieved within the visualization community in the last decade, many challenging problems are still open in volume rendering. In this dissertation, we mainly study three challenging topics in advanced volume rendering on shadows, flows, and high-dimensional rendering. Shadows are essential to realistic and informative scenes. In volume rendering, the shadow calculation is difficult because the light intensity is attenuated as the light traverses the volume. We investigate a new shadow algorithm that properly determines the light attenuation and generates more accurate volumetric shadows with low storage requirements by using 2D shadow buffers. We have extended our shadow algorithm to deal with extended light sources and generate volumetric soft shadows with an analytic method and using a convolution technique. This shadow and soft shadow algorithm also has been applied to mixed scenes of volumetric and polygonal objects. Multiple light scattering is also modeled in our volumetric lighting model. Interval volume algorithm is a region-of-interest extraction algorithm for steady and time-varying three-dimensional structured and unstructured grids. We present several new rendering operations to provide effective visualizations of the 3D scalar field. This technique has been extended to four dimensions to extract time-varying interval volumes. The time-varying interval volumes are rendered directly, from 4-simplices to image space. We propose a high-dimensional rendering algorithm and solve this technical challenge. In this way, we can visualize the integrated interval volumes across time steps and see how interval volumes change over time in a single view. Three-dimensional flow visualization is a challenging topic. We propose an implicit flow field method to visualize 3D flow fields. An implicit flow field is first extracted using an advection operator on the flow, with a set of flow-related attributes stored. Two techniques are then employed to render the implicit flow field: an interval volume approach and a slice-based three-dimensional texture mapping approach. With these two techniques, we achieve the user-controlled representation and appearance of flow volumes, and display flow details interactively.
Roger Crawfis (Advisor)
197 p.
Computer Science
volume rendering; volumetric shadows; soft shadows; multiple scattering; unstructured grids; interval volumes; time-varying interval volumes; flow visualization; implicit flow fields

Recommended Citations

Citations

  • Zhang, C. (2006). Advanced volume rendering on shadows, flows and high-dimensional rendering [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1143150322

    APA Style (7th edition)

  • Zhang, Caixia. Advanced volume rendering on shadows, flows and high-dimensional rendering. 2006. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1143150322.

    MLA Style (8th edition)

  • Zhang, Caixia. "Advanced volume rendering on shadows, flows and high-dimensional rendering." Doctoral dissertation, Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=osu1143150322

    Chicago Manual of Style (17th edition)

osu1143150322
1,236
© 2006, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.