in this paper, for the purpose of investigating horizontal sound propagation, based on the results obtained from practical measurements in the strait of hormoz and available data on sound speed variations at different depths, a comprehensive model for shallow water multipath underwater acoustic channel is presented. mathematical modeling of multipath effect is based on ray theory and the image ...

We describe a dynamic load-balancing algorithm for ray-tracing by progressive refinement on a distributed-memory parallel computer. Parallelization of progressive ray-tracing for single images is difficult because of the inherent sequential nature of the sample location generation process, which is optimized (and different) for any given image. Parallelization of progressive ray-tracing when ge...

This paper describes a parallel processing scheme for bidirectional ray tracing which improves the reality of the image drastically. It is organized from two stages, i.e. light ray tracing and viewing ray tracing. In light ray tracing, pairs of a light source and an element of objects are distributed to each processor dynamically. In viewing ray tracing, we use a screen subdivision al­ gorithm....

This work is aimed at the development of effective algorithms for building of full SAH BVH trees on GPU in real-time. In this work it is presupposed that all the scene objects are represented by a number of triangles (the so-called “triangle soup”), at the same time the arbitrary changes in the geometry are allowed in the process of rendering. The proposed methods have allowed more than tenfold...

Аbstract—This article describes the technologies of parallel processing of ray tracing using central processing unit (CPU) and graphics processing unit (GPU). The one problem of parallel processing of ray tracing is imbalance among the pixels computation which leads to performance degradation. A serious disadvantage of ray tracing is performance. Other algorithms use data coherence to share com...

Ray tracing is an attractive technique for visualizing scientific data because it can produce high quality images that faithfully represent physically-based phenomena. Its embarrassingly parallel reputation makes it a natural candidate for visualizing large data sets on distributed memory clusters, especially for machines without specialized graphics hardware. Unfortunately, the traditional rec...

We present fast ray tracing of dynamic scenes in this paper with primary and shadow rays. We present a GPUfriendly strategy to bring coherency to shadow rays, based on previous work on grids as acceleration structures. We introduce indirect mapping of threads to rays to improve the performance of ray tracing on the GPU for the traversal and intersection steps. We also construct a light frustum ...

Current methods for predicting stress distribution on a cell surface due to optical trapping forces are based on a traditional ray optics scheme for fixed geometries. Cells are typically modeled as solid spheres as this facilitates optical force calculation. Under such applied forces however, real and non-rigid cells can deform, so assumptions inherent in traditional ray optics methods begin to...

We present a method of ray tracing that is based on a system of differential equations equivalent to the eikonal equation, but formulated in the ray coordinate system. We use a first-order discretization scheme that is interpreted very simply in terms of the Huygens’ principle. The method has proved to be a robust alternative to conventional ray tracing, while being faster and having a better a...

We propose two hardware mechanisms to decrease energy consumption on massively parallel graphics processors for ray tracing. First, we use a streaming data model and configure part of the L2 cache into a ray stream memory to enable efficient data processing through ray reordering. This increases L1 hit rates and reduces off-chip memory energy substantially through better management of off-chip ...