This paper examines existing bidirectional ray tracing algorithms and the bottlenecks and possible benefits compared to backward tracing methods. The results of the implementation of one algorithm is provided. The article addresses the problems in the implementation of this a system including accurate probability calculation and efficient ray generation.

This paper deals with representing several of the phenomena that occur when light travels a curved path through inhomogeneous media, such as the well-known mirages. Traditional curved ray tracing presents several problems which have not been efficiently solved yet. We present here our approach based both on curved ray tracing and photon mapping, introducing the concept of curved photon mapping.

Ray tracing algorithms often approximate indirect diiuse lighting by means of an ambient lighting term. In this paper we show how a similar term can be used as a variance reducing technique for stochastic ray tracing. In a theoretical derivation we prove that the technique is mathematically correct. Test results demonstrate its usefulness and eeectiveness in practice.

Indoor Radio Channel Models based on Measurements and Ray-Tracing at 5.2 GHz1 Stefan Mangold, Matthias Lott2 Abstract| In [2], time-domain channel models are used to investigate transmission schemes. The way of how these models are developed based on ray tracing as well as channel sounding results is discussed in this paper.

This paper presents a fast algorithm for daylight simulation and analysis of complex architectural environments that considers both direct sunlight and diffuse daylight. Shadow determination is performed using a combination of parallel projection and ray tracing techniques. Parallel projection provides execution times that are linear with respect to the number of polygonal objects in the enviro...

A system is presented for ray tracing trimmed NURBS surfaces. While approaches to components are drawn largely from existing literature, their combination within a single framework is novel. This paper also differs from prior work in that the details of an efficient implementation are fleshed out. Throughout, emphasis is placed on practical methods suitable to implementation in general ray trac...

To obtain good performance on the GPU hardware, it is necessary to design algorithms to manage data, access memory under GPU memory hierarchy, and schedule more efficient threads. In this paper, we propose an efficient data management and task management designed for GPU based ray tracing. Due to the dynamic and uncertainty in ray tracing, we design data-management layer and task-management lay...

ALE-AMR is a new hydrocode that we are developing as a predictive modeling tool for debris and shrapnel formation in high-energy laser experiments. In this paper we present our approach to implementing laser ray tracing in ALE-AMR. We present the basic concepts of laser ray tracing and our approach to efficiently traverse the adaptive mesh hierarchy.

ID: 18548 Title: A Splatting Method to Generate DRRs for Deformed CT Volume Purpose: To develop an efficient algorithm for generating high-quality digitally reconstructed radiographs (DRRs) for regularly and irregularly sampled volumes based on a splatting method with dynamic elliptical Gaussian kernels, and to evaluate this method using ray tracing. Methods: The traditional ray tracing method,...