Accession Number : ADA320781

Title :   Interactive Exploration of Large 3-D Unstructured-Grid Data.

Descriptive Note : Contractor rept.,

Corporate Author : INSTITUTE FOR COMPUTER APPLICATIONS IN SCIENCE AND ENGINEERING HAMPTON VA

Personal Author(s) : Ma, Kwan-Liu ; Leutenegger, Scott ; Mavriplis, Dimitri

PDF Url : ADA320781

Report Date : OCT 1996

Pagination or Media Count : 19

Abstract : Visualizing unstructured-grid data from aerodynamic calculations is challenging because of the associated meshes are typically large in size and irregular in both shape and resolution. This research investigates appropriate data structures and rendering methods to allow interactive exploration of the data. In conjunction with fast splatting rendering, a multiresolution data representation based on agglomeration is used to make possible interactive visualization on a workstation. That is, data are rendered at a particular resolution according to visualization parameters as well as the speed and memory capacity of the workstation. Interactive visualization allows the user to quickly determine regions of interest and important visualization parameters such as viewing direction and transfer functions. We then apply a more accurate, expensive rendering method to the original data on the regions of interest. The original data are stored on disk. We show with both analysis and experimental results that R-tree is a better data structure for fast retrieval of such disk-resident data.

Descriptors :   *DATA MANAGEMENT, *INTERACTIVE GRAPHICS, DATA BASES, ALGORITHMS, SOFTWARE ENGINEERING, GRIDS, HIGH RESOLUTION, THREE DIMENSIONAL, INFORMATION RETRIEVAL, COMPUTER GRAPHICS, DATA DISPLAYS, AERODYNAMICS.

Subject Categories : Computer Programming and Software

Distribution Statement : APPROVED FOR PUBLIC RELEASE