Now showing items 1-20 of 29

    • Interactive Direct Volume Rendering of Time-Varying Data 

      Clyne, John; Dennis, John M. (Springer and The Eurographics Association, 1999)
      Previous efforts aimed at improving direct volume rendering performance have focused largely on time-invariant, 3D data. Little work has been done in the area of interactive direct volume rendering of timevarying data, ...
    • Efficient Ray Intersection for Visualization and Navigation of Global Terrain using Spheroidal Height-Augmented Quadtrees 

      Wartell, Zachary; Ribarsky, William; Hodges, Larry (Springer and The Eurographics Association, 1999)
      We present an algorithm for efficiently computing ray intersections with multi-resolution global terrain partitioned by spheroidal height-augmented quadtrees. While previous methods support terrain defined on a Cartesian ...
    • Geodesic Flow on Polyhedral Surfaces 

      Polthier, Konrad; Schmies, Markus (Springer and The Eurographics Association, 1999)
      On a curved surface the front of a point wave evolves in concentric circles which start to overlap and branch after a certain time. This evolution is described by the geodesic flow and helps us to understand the geometry ...
    • Exploring Instationary Fluid Flows by Interactive Volume Movies 

      Glau, Thomas (Springer and The Eurographics Association, 1999)
      Volume rendering offers the unique ability to represent inner object data and to realize enclosed structures ""at first glance"". Unlike software-based methods, the use of more and more available specialpurpose hardware ...
    • Fast Volume Rotation using Binary Shear-Warp Factorization 

      Csebfalvi, Balazs (Springer and The Eurographics Association, 1999)
      This paper presents a fast volume rotation technique based on binary shear-warp factorization. Unlike many acceleration algorithms this method does not trade image quality for speed and does not require any specialized ...
    • Internet-Based Front-End to Network Simulator 

      He, Taosong (Springer and The Eurographics Association, 1999)
      We present a Java-based interactive visual interface to network simulators. Having successfully incorporated network visualization technologies, our system provides an effective front-end interface supporting real time ...
    • A Methodology for Comparing Direct Volume Rendering Algorithms Using a Projection-Based Data Level Approach 

      Kim, Kwansik; Pang, Alex (Springer and The Eurographics Association, 1999)
      Identifying and visualizing uncertainty together with the data is a well recognized problem. One of the culprits that introduce uncertainty in the visualization pipeline is the visualization algorithm itself. Uncertainties ...
    • Efficiently Rendering Large Volume Data Using Texture Mapping Hardware 

      Tong, Xin; Wang, Wenping; Tsang, Waiwan; Tang, Zesheng (Springer and The Eurographics Association, 1999)
      Volume rendering with texture mapping hardware is a fast volume rendering method available on high-end workstations. However, limited texture memory often prevents the method from being used to render large volume data ...
    • Geometric Methods for Vortex Extraction 

      Sadarjoen, I. Ari; Post, Frits H. (Springer and The Eurographics Association, 1999)
      This paper presents two vortex detection methods which are based on the geometric properties of streamlines. Unlike traditional vortex detection methods, which are based on point-samples of physical quantities, one of our ...
    • Attribute-Based Feature Tracking 

      Reinders, Freek; Post, Frits H.; Spoelder, Hans J. W. (Springer and The Eurographics Association, 1999)
      Visualization of time-dependent data is an enormous task because of the vast amount of data involved. However, most of the time the scientist is mainly interested in the evolution of certain features. Therefore, it suffices ...
    • A Comparison of Error Indicators for Multilevel Visualization on Nested Grids 

      Gerstner, Thomas; Rumpf, Martin; Weikard, Ulrich (Springer and The Eurographics Association, 1999)
      Multiresolution visualization methods have recently become an indispensable ingredient of real time interactive post processing. Here local error indicators serve as criteria where to refine the data representation on the ...
    • New Approaches for Particle Tracing on Sparse Grids 

      Teitzel, Christian; Ertl, Thomas (Springer and The Eurographics Association, 1999)
      Flow visualization tools based on particle methods continue to be an important utility of flow simulation. Additionally, sparse grids are of increasing interest in numerical simulations. In [14] we presented the advontages ...
    • Parallel Multipipe Rendering for Very Large Isosurface Visualization 

      Udeshi, Tushar; Hansen, Charles D. (Springer and The Eurographics Association, 1999)
      In exploratory scientific visualization, isosurfaces are typi- cally created with an explicit polygonal representation for the surface using a technique such as Marching Cubes. For even moderate data sets, Marchching Cubes ...
    • Parallel Ray Casting of Visible Human on Distributed Memory Architectures 

      Bajaj, Chandrajit; Ihm, Insung; Koo, Gee-bum; Park, Sanghun (Springer and The Eurographics Association, 1999)
      This paper proposes a new parallel ray-casting scheme for very large volume data on distributed-memory architectures. Our method, based on data compression, attempts to enhance the speedup of parallel rendering by quickly ...
    • On Simulated Annealing and the Construction of Linear Spline Approximations for Scattered Data 

      Kreylos, Oliver; Hamann, Bernd (Springer and The Eurographics Association, 1999)
      We describe a method to create optimal linear spline approximations to arbitrary functions of one or two variables, given as scattered data without known connectivity.We start with an initial approximation consisting of a ...
    • Procedural Shape Generation for Multi-dimensional Data Visualization 

      Ebert, David S.; Rohrer, Randall M.; Shaw, Christopher D.; Panda, Pradyut; Kulda, James M.; Roberts, D. Aaron (Springer and The Eurographics Association, 1999)
      Visualization of multi-dimensional data is a challenging task. The goal is not the display of multiple data dimensions, but user comprehension of the multi-dimensional data. This paper explores several techniques for ...
    • Real-Time Maximum Intensity Projection 

      Mroz, Lukas; König, Andreas; Gröller, Eduard (Springer and The Eurographics Association, 1999)
      Maximum Intensity Projection (MIP) is a volume rendering technique which is used to extract high-intensity structures from volumetric data. At each pixel the highest data value encountered along the corresponding viewing ...
    • Advances in Quality Control of Intraoperative Radiotherapy 

      Walter, Stefan; Straßmann, Gerd; Schmitt, Marco (Springer and The Eurographics Association, 1999)
      Intraoperative radiotherapy is the kind of radiotherapy where the remains of a surgically not completely removed tumour are irradiated at the open situ of the patient. The current main drawback of this radiotherapy is the ...
    • Analysis and Visualization of the Brain Shift Phenomenon in Neurosurgery 

      Lürig, C.; Hastreiter, P.; Nimsky, C.; Ertl, T. (Springer and The Eurographics Association, 1999)
      In this paper we present a method for analyzing the brain shift. The brain shift is a brain deformation phenomenon, that occurs during surgical operations on the opened head. This deformation makes navigation within the ...
    • A Client-side Approach towards Platform Independent Molecular Visualization over the World Wide Web 

      Bender, Michael; Hagen, Hans; Seck, Axel (Springer and The Eurographics Association, 1999)
      A web-based, entirely platform independent Molecular Visualization System has been developed using state of the Internet programming techniques. This system offers the visualization of various molecular models, molecular ...