role in planning of modern broadband mobile radio networks. While the less accurate statistical models predict only the path loss, the more precise ray tracing techniques enable computation of additional parameters, e.g. the mean delay and the delay spread, which are significant for the 4G network planning. The existing ray tracing methods are mainly applied in the indoor and narrow urban envir...

This paper presents a ray-tracing method for modeling Ultra Wide Bandwidth indoor propagation channels. A validation of the ray tracing model with our indoor measurement is also presented. Based on the validated model, the multipath channel parameter like the fading statistics and root mean square delay spread for Ultra Wide bandwidth frequencies are simply extracted. The proposed ray-tracing m...

There is recent interest in GPU architectures designed to accelerate ray tracing, especially on mobile systems with limited memory bandwidth. A promising recent approach is to store and traverse Bounding Volume Hierarchies (BVHs) [KK86], used to accelerate ray tracing, in low arithmetic precision. However, so far there is no research on refitting or construction of such compressed BVHs, which i...

Ray Tracing is one of the most important rendering techniques used in computer graphics. Ray traced images are more accurate and photo-realistic as compared to direct rendering. Ray Tracing was earlier considered impractical for rendering scenes at interactive rates because of its high computational cost. However, with the advancements in modern Graphics Processing Units (GPU) and CPUs, ray tra...

Ray tracing is certainly one of the fundamental algorithms in the world of computer graphics. Given enough time, processing power, and highly detailed geometry, the algorithm can produce wonderfully realistic renderings. However, these requirements, especially the first two, can cause a number of headaches for individuals interested in creating renderings. This paper focuses on including the dy...

We present a novel surface reconstruction algorithm which can directly reconstruct surfaces with different levels of smoothness in one framework from height fields using 3D discrete grid ray tracing. Our algorithm exploits the 2.5D nature of the elevation data and the regularity of the rectangular grid from which the height field surface is sampled. Based on this reconstruction method, we also ...

This paper describes two approaches that allow us to intersect rays with triangular meshes more quickly by amortizing computation over neighbouring triangles. The first approach accomplishes this by performing the in-out test for each triangle using three plane equations, each one representing a boundary edge for the triangle. Each plane is shared between four neighbouring triangles and the cos...

In this paper we present an interactive GPU-based, GUI client, working with rendering server employing ray tracing based global illumination. The client is designed to guarantee interactivity (namely 1/60sec response time) no matter how slow the rendering server is. The client dynamically adjusts image resolution to match the server performance and complexity of the rendered scene. When the sce...

Despite nearly universal support for the IEEE 754 floating-point standard on modern generalpurpose processors, a wide variety of more specialized processors do not provide hardware floating-point units and rely instead on integer-only pipelines. Ray tracing on these platforms thus requires an integer rendering process. Toward this end, we clarify the details of an existing fixed-point ray/trian...