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We present a system that combines voxel and polygonal representations into a single octree acceleration structure that can be used for ray tracing. Voxels are well-suited to create good level-of-detail for high-frequency models where polygonal simplifications usually fail due to the complex structure of the model. However, polygonal descriptions provide the higher visual fidelity. In addition, voxel representations often oversample the geometric domain especially for large triangles, whereas a few polygons can be tested for intersection more quickly.
Using virtual environment systems for road safety education requires a realistic simulation of road traffic. Current traffic simulations are either too restricted in their complexity of agent behavior or focus on aspects not important in virtual environments. More importantly, none of them are concerned with modeling misbehavior of traffic participants which is part of every-day traffic and should therefore not be neglected in this context. We present a concept for a traffic simulation that addresses the need for more realistic agent behavior with regard to road safety education. The two major components of this concept are a simulation of persistent agents which minimizes computational overhead and a model of cognitive processes of human drivers combined with psychological personality profiles to allow for individual behavior and misbehavior.
Comparing Non-Visual and Visual Guidance Methods for Narrow Field of View Augmented Reality Displays
(2020)
Foreword to the Special Section on the Symposium on Virtual and Augmented Reality 2019 (SVR 2019)
(2020)
In recent years, a variety of methods have been introduced to exploit the decrease in visual acuity of peripheral vision, known as foveated rendering. As more and more computationally involved shading is requested and display resolutions increase, maintaining low latencies is challenging when rendering in a virtual reality context. Here, foveated rendering is a promising approach for reducing the number of shaded samples. However, besides the reduction of the visual acuity, the eye is an optical system, filtering radiance through lenses. The lenses create depth-of-field (DoF) effects when accommodated to objects at varying distances. The central idea of this article is to exploit these effects as a filtering method to conceal rendering artifacts. To showcase the potential of such filters, we present a foveated rendering system, tightly integrated with a gaze-contingent DoF filter. Besides presenting benchmarks of the DoF and rendering pipeline, we carried out a perceptual study, showing that rendering quality is rated almost on par with full rendering when using DoF in our foveated mode, while shaded samples are reduced by more than 69%.
Die Fachhochschulen haben sich als Hochschulen für angewandte Wissenschaften seit ihrer Gründung Anfang der 70er Jahre deutlich gewandelt. Das Fächerportfolio vieler Fachhochschulen ist inzwischen mit jenem der Universitäten vergleichbar. In einigen Fächern bilden die Fachhochschulen sogar den überwiegenden Anteil von Absolventen aus. Die anwendungsorientierte Spitzenforschung gehört zum Selbstverständnis vieler Fachhochschulen. Vor diesem Hintergrund ist es unverständlich und für die wirtschaftliche Zukunftsfähigkeit schädlich, dass Fachhochschulen immer noch deutliche Wettbewerbsnachteile in der Weiterqualifizierung des wissenschaftlichen Nachwuchses haben. Dies gilt umso mehr, wenn mit Fachhochschulen vergleichbaren privaten Hochschulen das Promotionsrecht zugestanden wird.