For almost two decades researchers have argued that ray tracing will eventually become faster than the rasterization technique that completely dominates todays graphics hardware. However, this has not happened yet. Ray tracing is still exclusively being used for off-line rendering of photorealistic images and it is commonly believed that ray tracing is simply too costly to ever challenge raster...

In the present paper, the Zelt algorithm has been extended for ray tracing through an anisotropic model. In anisotropic media, the direction of the propagated energy generally differs from that of the plane-wave propagation. This makes velocity values to be varied in different directions. Therefore, velocity modeling in such media is completely different from that in an isotropic media. The vel...

Efficient ray tracing of subdivision surfaces is an important problem in production rendering, and for interactive applications in the near future. The current hardware trends for both CPUs and GPUs suggest that compute power is outpacing bandwidth. Despite this, current approaches for ray tracing subdivision surfaces favor geometry caches or full pre-tessellation. We demonstrate that directly ...

We investigate the use of two-level nested grids as acceleration structure for ray tracing of dynamic scenes. We propose a massively parallel, sort-based construction algorithm and show that the two-level grid is one of the structures that is fastest to construct on modern graphics processors. The structure handles non-uniform primitive distributions more robustly than the uniform grid and its ...

Currently, for the planning of wireless cellular networks in urban scenarios either empirical (direct ray or over rooftop ray) or ray-optical (ray tracing) propagation models are used. In this paper both approaches are compared to one another and to measurements in different urban city centers. Additionally a new concept which is called Dominant Path Model (DPM) is presented in this paper. This...

This paper describes a bidirectional Monte Carlo ray tracing method simu lating global illumination in models containing complex objects that do not have to be tessellated The two pass method combines a rst pass light ray tracing ray casting with a second pass optimized Monte Carlo ray tracing In the rst pass the light emitted from the light sources hit objects in the scene and may be re ected ...

For radio propagation prediction, recent simulations involving ray tracing offer unprecedented accuracy [1], [11], [13], [14]. These techniques surpass statistical channel models and provide a bounty of additional information including RNIS delay spread, angle of arrival·, and overall wide band channel impulse response. In particular,· three dimensional ray tracing produces an accurate, determi...

Interactive high-fidelity rendering is one of the major goals of computer graphics. Algorithms based on ray tracing are usually used to drive high-fidelity renderers. While ray tracing is often thought to be impractical for real time performance, recent algorithmic advances in the field have led to the development of interactive ray tracers which leverage the performance of modern parallel syst...

Computer graphics techniques allow the generation of realistic and hyperrealistic images. Some of these techniques are discussed in this paper. Ray tracing and radiosity produce 2D images out of a 3D synthetic object description. Two extensions of the ray tracing technique (nonlinear ray tracing, extended camera specification) are described. Finally image warping and image morphing which manipu...

With the shift from highly clocked, single thread processors to chips that have dozens or even hundreds of smaller processors, we are witnessing a fundamental change in the computing hardware we use. This paper describes an approach to use modern many-core-hardware to apply real time ray tracing to Virtual Reality environments. We show that current hardware can speed up real time ray tracing to...