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| Enhanced Schlieren with circular cutoff (top), and shadow- graph renderings (middle, bottom) of the X38 dataset from the side, simulating wind tunnel effects. The white band on the nose of the spacecraft indicates the pres- ence of a bow shock. The white band behind the fins shows the presence of a wake formed from vortex cores. The bottom image alters the middle image by visualizing the absolute value of the shadowgraph operator. |
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| Traces of 110 particles tracked over 400 timesteps in the Lang data set. Upper image: RBF encoded data set and GPU-based computation. Middle image: Original Cartesian grid and software implementation. Lower images: Slices of features extracted on the RBF encoded Lang data set. Lower left image: lamda2 values. Lower Right image: a color coding of the vorticity magnitude. |
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| Volume rendering of 1,943,383 tetrahedra shock dataset (compression shock) using 4,538 RBF functions. |
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Upper Left and middle images: explosion plumes generated with 2D technique. Upper right image: explosion generated with a fully 3D simulation. Lower images: Rising smoke computed using the vorticity confinement method. |
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| A uniform grid HJ-WENO based particle level set three dimentional deformation test. |
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Level-of-detail streamline visualization of the dynvort data set. Upper image: visualization generated using hierarchical approach with 10 level in the hierarchy. Lower images: visualization of dynvort data set with varying streamline properties. |
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| Texture synthesis (below) yields detail that follows the surface implied by the hand painted shading (above). |
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| Leaves that are blown off the tree. |
| Publications |
Svakhine N., Jang Y., Ebert D. S., Gaither K. P., We have developed new techniques for effective flow visualization. By combining oriented feature visualization techniques with flexible transfer function controls, we can visualize scalar and vector data, allow comparative visualization of flow properties in a succinct, informative manner, and provide continuity for visualizing time-varying datasets.
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Manfred Weiler, Jingshu Huang, Yun Jang, Simon Stegmaier, Kelly P. Gaither, David Ebert, and Thomas Ertl. We have developed new hierarchical techniques that effectively encode data on arbitrary grids including volumetric scalar, vector, and multi-field data. For the special requirements of flow visualization, we derive the definitions of well known features in RBF space allowing us to integrate pixel accurate hardware-accelerated feature detection and visualization techniques.
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David S. Ebert and Yun Jang.
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Yun Jang, Manfred Weiler, Matthias Hopf, Jingshu Huang, David S. Ebert, Kelly P. Gaither, and Thomas Ertl. We have developed a new approach that allows interactive rendering and navigation of procedurally-encoded 3D scalar fields by reconstructing radial basis functions (RBF) on PC class graphics processing units.
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| Rasmussen, N., Nguyen, D., Geiger, W. and Fedkiw, R. We present an efficient method for simulating highly detailed large scale participating media such as the nuclear explosions.
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| Nguyen, D., Enright, D., and Fedkiw, R. In this article, we give a brief overview of methods that are currently used to
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| Enright, D., Losasso, F. and Fedkiw, R. In this paper, we present an efficient semi-Lagrangian based particle
level set method for the accurate capturing of interfaces. This method
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Utkarsh Ayachit, Penny Rheingans. In this paper we explore a level-of-detail (LOD) approach for generating streamline visualizations. We identify the properties of streamlines that can affect perception of LOD and show how they can be used effectively. Using a LOD approach, textbook-like streamline visualizations can be generated.
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Hui Fang, John C. Hart. We combine existing techniques for shape-from-shading and texture synthesis to create a new tool for texturing objects in photographs. Our approach clusters pixels with similar recovered normals into patches on which texture is synthesized. Distorting the texture based on the recovered normals creates the illusion that the texture adheres to the undulations of the photographed surface.
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| Hui Fang, John C. Hart We combine physical and procedural motion techniques into a multiresolution model to simulated complex virtual environments. |
 Projects IEEE Visualization ACM SIGGRAPH |