Dr. Roger Crawfis Profile

Dr. Roger Crawfis

at The Ohio State Univ

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Publications (5)

Proceedings Article | 18 January 2010 Paper

Distributed visualization framework architecture

Oleg Mishchenko, Sundaresan Raman, Roger Crawfis

Proceedings Volume 7530, 75300K (2010) https://doi.org/10.1117/12.838702

KEYWORDS: Visualization, Human-machine interfaces, Volume rendering, Cameras, Interfaces, Algorithm development, Telecommunications, Personal digital assistants, Scientific visualization, OpenGL

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An architecture for distributed and collaborative visualization is presented. The design goals of the system are to create a lightweight, easy to use and extensible framework for reasearch in scientific visualization. The system provides both single user and collaborative distributed environment. System architecture employs a client-server model. Visualization projects can be synchronously accessed and modified from different client machines. We present a set of visualization use cases that illustrate the flexibility of our system. The framework provides a rich set of reusable components for creating new applications. These components make heavy use of leading design patterns. All components are based on the functionality of a small set of interfaces. This allows new components to be integrated seamlessly with little to no effort. All user input and higher-level control functionality interface with proxy objects supporting a concrete implementation of these interfaces. These light-weight objects can be easily streamed across the web and even integrated with smart clients running on a user's cell phone. The back-end is supported by concrete implementations wherever needed (for instance for rendering). A middle-tier manages any communication and synchronization with the proxy objects. In addition to the data components, we have developed several first-class GUI components for visualization. These include a layer compositor editor, a programmable shader editor, a material editor and various drawable editors. These GUI components interact strictly with the interfaces. Access to the various entities in the system is provided by an AssetManager. The asset manager keeps track of all of the registered proxies and responds to queries on the overall system. This allows all user components to be populated automatically. Hence if a new component is added that supports the IMaterial interface, any instances of this can be used in the various GUI components that work with this interface. One of the main features is an interactive shader designer. This allows rapid prototyping of new visualization renderings that are shader-based and greatly accelerates the development and debug cycle.

Proceedings Article | 4 June 2004 Paper

Fast dynamic flow volume rendering using textured splats on modern graphics hardware

Daqing Xue, Roger Crawfis

Proceedings Volume 5295, (2004) https://doi.org/10.1117/12.539248

KEYWORDS: Volume rendering, Visualization, Algorithm development, Eye, RGB color model, OpenGL, Phase shifts, Opacity, Particles, Computer graphics

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Proceedings Article | 12 March 2002 Paper

View-dependent approach to MIP for very large data

Naeem Shareef, Roger Crawfis

Proceedings Volume 4665, (2002) https://doi.org/10.1117/12.458784

KEYWORDS: Visualization, Volume rendering, OpenGL, Image quality, Image classification, Skull, Visibility, Surgery, Imaging arrays, Teeth

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Proceedings Article | 28 February 2000 Paper

Approximating scatterplots of large datasets using distribution splats

Matthew Camuto, Roger Crawfis, Barry Becker

Proceedings Volume 3960, (2000) https://doi.org/10.1117/12.378890

KEYWORDS: Opacity, Volume rendering, Modulation, Visualization, Associative arrays, Eye, Tin, Information science, Computing systems, Chemical elements

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Proceedings Article | 7 April 1995 Paper

Advances in scientific visualization

Nelson Max, Roger Crawfis

Proceedings Volume 2410, (1995) https://doi.org/10.1117/12.205966

KEYWORDS: Scientific visualization, Clouds, Climatology, Computer simulations, Multiple scattering, Visualization, Volume rendering, Opacity, Transparency, Ray tracing

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