Stanislav V. Klimenko

Streamball techniques for flow visualization

We introduce the concept of streamballs for flow visualization. Streamballs are based upon implicit surface generation techniques adopted from the well-known metaballs. Their property to split or merge automatically in areas of significant divergence or convergence makes them an ideal tool for the visualization of arbitrary complex fields. Using convolution surfaces generated by continuous skeletons for streamball construction offers the possibility to visualize even tensor fields.<<ETX>>

Research issues in data modeling for scientific visualization

This article summarizes some topics of modeling as they impinge on the future development of scientific data visualization. The benefits from visualization techniques in analyzing data are well established, but to build on these pioneering efforts, one must recognize modeling as a distinct structural component in the larger context of visualization and problem-solving systems. Volume modeling is the entry way to this arena of future development, and model-based rendering describes how scientists will view the results. Important side developments such as multiresolution modeling and model-based segmentation will contribute structural capability to these systems. All of these components ultimately depend on the mathematical foundations of scattered data modeling and on model validation and standards to incorporate this modeling methodology into effective tools for scientific inquiry.<<ETX>>

Exotic solutions in string theory

SummarySolutions of classical string theory, corresponding to the world sheets, mapped in Minkowski space with a fold, are considered. Typical processes for them are creation of strings from vacuum, their recombination and annihilation. These solutions violate positiveness of square of mass and Regge condition. In quantum string theory these solutions correspond to physical states |DDF〉 + |sp〉 with non-zero spurious component.

Visualization in string theory

Abstract The tools for visualization of relativistic string dynamics in various topological classes are developed. New theoretical results, obtained with the aid of these tools, are described.

Virtual planetarium in cyberstage

We describe an educational application in virtual environment, intended for teaching and demonstration of basics of astronomy. The application includes 3D models of 30 objects in the Solar System, 3200 nearby stars, a large database, containing textual descriptions of all objects in a scene, interactive map of constellations and tools for search and navigation. The methods, needed for visualization of different scale astronomical objects in virtual environment, are described.

Flexible materials in Avango/spl trade/ virtual environment framework

We describe a system for real-time simulation of linear elastic deformations of volumetric objects in virtual environments, implemented in Avango VE framework [T. H. Avocado (1999)]. The approach makes use of the methods of finite and boundary elements and precomputed Greens functions, and supports real-time interactive deformations of large elastic models, containing more than 10,000 volumetric nodes, at the graphics update rate 85fps.

The quantum Coulomb three-body problem - Visualization of simulation results and numerical methods

Some years ago it was established that the muon catalyzed fusion phenomenon could be used for the production of energy. This fact has been causing a rebirth of interest in the universal methods of solving the quantum Coulomb three-body problem. The adiabatic hyperspherical (AHS) approach considered in this joint project has definite advantages in comparison with other methods. The case study proposed focuses on the study of the structure and behavior of the wave function of bound states of a quantum three-body system as well as of the basis functions of the AHS approach. Adapted scientific visualization tools such as surface rendering, volume ray tracing and texturing will be used. Visualization allows to discover interesting features in the behavior of the basis functions and to analyze the convergence of the AHS-expansion for the wave functions.<<ETX>>

Adventures of Möbius band: mathematical visualization in virtual environment

Differential geometry and topology are the areas of higher mathematics, which particularly require visual representation of studying objects for better understanding of the material. On the other hand, the complex structure of such objects makes their visualization a challenge for modern graphical systems. In this video we demonstrate real-time methods for adequate representation of topologically non-trivial objects in virtual environment systems, particularly the acceleration of standard mechanisms for rendering of transparent surfaces, applicable for complex cases of self-intersecting time-dependent surfaces, not necessarily admitting continuous fields of normal vectors. We also use the technique of image-based rendering, which places stereo-photographs of real environments as static background for 3D virtual scenes. The methods are implemented in educational application, which demonstrates the main properties of elementary topological objects (Möbius band, Klein bottle, projective plane etc) and gives a possibility to explore interactively the complex constructions, arising in higher mathematics.

Computer graphics at IHEP

Abstract Various application areas of presentation graphics and a number of requirements to them in the field of experimental high energy physics are considered. A pipeline model of the presentation graphics software for the applied graphics system and functional capabilities of the graphics package ATOM84 are discussed.