Tobias Schafhitzel

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We introduce a point-based algorithm for computing and rendering stream surfaces and path surfaces of a 3D flow. The points are generated by particle tracing, and an even distribution of those particles on the surfaces is achieved by selective particle removal and creation. Texture-based surface flow visualization is added to show inner flow structure on(More)
In this paper, we present a mapping of nonlinear ray tracing to the GPU which avoids any data transfer back to main memory. The rendering process consists of the following parts: ray setup according to the camera parameters , ray integration, ray–object intersection, and local illumination. Bent rays are approximated by polygonal lines that are represented(More)
This paper presents an interactive technique for the dense texture-based visualization of unsteady 3D flow, taking into account issues of computational efficiency and visual perception. High efficiency is achieved by a 3D graphics processing unit (GPU)-based texture advection mechanism that implements logical 3D grid structures by physical memory in the(More)
We present a framework for interactively visualizing volumetric Adaptive Mesh Refinement (AMR) data. For this purpose we employ complex data structures to map the entire AMR dataset to graphics memory. This allows to apply hardware accelerated visualization algorithms previously only operating on uniform cartesian grids. For mapping the data to graphics(More)
This paper presents an interactive technique for the dense texture-based visualization of unsteady 3D flow, taking into account issues of computational efficiency and visual perception. High efficiency is achieved by a novel 3D GPU-based texture advection mechanism that implements logical 3D grid structures by physical memory in the form of 2D textures.(More)
This paper describes methods for explanatory and illustrative visualizations used to communicate aspects of Einstein's theories of special and general relativity, their geometric structure, and of the related fields of cosmology and astrophysics. Our illustrations target a general audience of laypersons interested in relativity. We discuss visualization(More)
This paper presents a real time technique for planetary rendering and atmospheric scattering effects. Our implementation is based on Nishita's atmospheric model which describes actual physical phenomena, taking into account air molecules and aerosols, and on a continuous level-of-detail planetary renderer. We obtain interactive frame rates by combining the(More)
We present a framework for the interactive generation of 3D panorama maps. Our approach addresses the main issue that occurs during panorama map construction: non-linear projection or deformation of the terrain in order to minimize the occlusion of important information such as roads and trails. Traditionally, panorama maps are hand-drawn by skilled(More)
In this application paper, we report on over fifteen years of experience with relativistic and astrophysical visualization, which has been culminating in a substantial engagement for visualization in the Einstein Year 2005—the 100 th anniversary of Einstein's publications on special relativity, the photoelectric effect, and Brownian motion. This paper(More)