Recently computer world was amazed by the explosive growth of the hardware efficiency. Average computer now has integrated hardware ability of displaying thousands triangles per second. Hi-end graphical accelerators (e.g. Sony Playstation 2) render up to 20 million triangles per second. However, importance of old good ray tracing, as the most accurate method for realistic image synthesis became...

This paper surveys Radiosity and Ray-tracing methods used in global illumination. Global illumination is based on light transport mechanism in real world. The light transport mechanism can be expressed in terms of BRDF of each element, and the most common and practical way is dividing the BRDF into specular and diffuse component. Mathematically Global illumination is a problem of solving numeri...

This work presents an algorithm to perform radiowave coverage predictions in urban environments using the Uniform Theory of Diffraction (UTD). The ray-tracing algorithm is based on the image theory for a quasi-3D environment. Multiple reflections and diffractions are considered through the separation of multipath components into four different classes, used to determine the scattered field. The...

Ray-tracing simulations, validated by experimental results, demonstrate that high intensity collimated x-ray beams can be produced from an isotropic x-ray source. A spherically bent mica crystal was used to collimate and monochromatize x rays emitted by a femtosecond laser-produced plasma. The result is a short pulse x-ray beam with a high degree of collimation ~less than 1 mrad divergence!, go...

Several ways of improving the realism of the results of traditional ray tracing are presented. The essential physical quantities of spectral radiant power and spectral radiance and their use in lighting calculations are discussed. Global illwnination terms are derived by employing illwnination ray tracing for calculation of quickly changing indirect lighting components, and radiosity ray tracin...

As the processing power of modern CPUs increases, coherent ray tracing becomes more and more popular, as it allows significantly accelerating ray tracing using SIMD instructions. It turns out, however, that as ray tracing is accelerated, other parts of physically accurate rendering algorithms tend to become bottlenecks. In this paper, we introduce a coherent physically accurate rendering approa...

In this report, we introduce a model based on geometrical optics which describes the propagation of light in homogeneous uniaxially anisotropic media. We call this model the OpIn model. A ray-tracing algorithm based on the OpIn model is also introduced. Results from a test case obtained by the OpIn model are compared with results from the commercial ray-tracing program ASAP. It appears that res...

Several ways of improving the realism of the results of traditional ray tracing are presented. The essential physical quantities of spectral radiant power and spectral radiance and their use in lighting calculations are discussed. Global illumination terms are derived by employing illumination ray tracing for calculation of quickly changing indirect lighting components, and ra-diosity ray traci...

Currently everyone is speaking about ray tracing. In 1968 rst steps in the elds of Ray Tracing were made. Since then, this topic keeps appearing in the media continuously. However, until now there are only applications in the high quality o ine area. In the real-time sector it has been kept in check consequently by the rasterization algorithm, which current graphics cards are designed for. But ...

The goal of ray tracing is to create images that are as accurate to real life as possible. Unfortunately, attaining this goal typically requires an extremely large amount of processing time. In this paper I propose a method for creating accurate soft shadows using graphics hardware to accelerate the process.