Shirley, P., Sung, K. and Brown, W., A Ray Tracing Framework for Global Illumination Systems. Proceedings of Graphics Interface '91, 1991, pp. 117 128..  Home/Search   Document Details and Download   Summary   Related Articles   Check

....illumination problems. There has been a significant effort in designing realistic rendering architectures to solve the same problem from different approaches. The most important ones are the Reyes architecture [2] the Ray Tracing Kernel [3] the Ray Tracing Framework for Global Illumination [4], the Cornell Image Synthesis Testbed [5] the Spectrum architecture [6] the Radiance system [7] and the Vision architecture [8] Most of these rendering architectures are devoted to a certain method or family of methods; the SIR system resembles the Vision philosophy more, but with a design at a ....

Shirley, P., Sung, K. and Brown, W., A Ray Tracing Framework for Global Illumination Systems. Proceedings of Graphics Interface '91, 1991, pp. 117 128..

....Architecture was described in [1] which was explicitly oriented towards a Z buffer techniques. In [2] it was introduced the concept of an abstract interface for geometric objects and shaders (by using object oriented techniques) in order to implement ray tracing. This framework was extended in [3]. Here an architecture is detailed which goes beyond simple ray tracing and accounts for Global Illumination, by using the zonal method. The elements of the system are described also as abstracts interfaces to concrete implementations. These works show architectures which are heavily oriented ....

Shirley, P., Sung, K., Brown, W.: "A Ray Tracing Framework for Global Illumination Systems". Proceedings of Graphics Interface'91, pp. 117-128. Canadian Information Processing Society, Toronto (Canada), 1991.

.... d z IIntegrator and IFunction Figure 1: The Rendering Equation ture of ray paths. Most methods, however have the common property that they are described using mathematics. Various architectures have been devised to handle this situation. Some have been tied to a specific technique [Cook87, Kirk88, Shirl91, Ward88, Walte97]. Others have been general enough to allow a variety of rendering techniques. The Cornel testbed for image synthesis [Trumb91] is a toolbox that can be used to construct a rendering package but is not object oriented. Glassners Spectrum architecture [Glass91] is an objectoriented framework ....

Peter Shirley, Kelvin Sung, and William Brown. A ray tracing framework for global illumination systems. Graphics Interface '91, pages 117--128, June 1991.

.... has been used to derive approximated PDFs for Monte Carlo integration through importance sampling (see Appendix A) The scattering distributions derived from these PDFs, in turn, have being used by nondeterministic physically based rendering algorithms [136] to simulate non Lambertian phenomena [8, 7, 198, 199, 203]. FUNDAMENTALS OF PHYSICALLY BASED RENDERING 33 Some of the ad hoc models are called transitional models [102] since they began a transition towards the energy equilibrium in rendering applications. The models proposed by Kay and Greenberg [133] and Hall and Greenberg [104] are examples of such ....

Shirley, P., and Sung, K. A ray tracing framework for global illumination systems. In Graphics Interface (Toronto, 1991), Canadian Information Processing Society, pp. 117--128.

....with several applications. 1 Introduction In the past, rendering systems have mostly been monolithic systems with little flexibility in the fundamental rendering algorithms they offered, and even less flexibility for integrating new developments. This is true both for the research community [17, 26, 23, 11, 15] and in particular for commercial rendering systems like Alias, SoftImage, and Wavefront. This situation is unsatisfying in many respects. Within a single research institute and in particular between different institutes, collaboration is often difficult due to many small, monolithic, and ....

....to create a self contained and open rendering kernel. The kernel software with selected will be made available to interested researchers. 1.2 Previous work Several other architectures for rendering have been published. However, most of them were restricted to a single rendering technique, e.g. [4, 10, 17, 26]. In contrast, the Cornell testbed for image synthesis [23] offers a large tool box of modules for implementing advanced rendering and global illumination algorithms, but it lacks a well structured framework. Another interesting approach is Glassner s Spectrum architecture [5] which describes ....

P. Shirley and K. Sung. A ray tracing framework for global illumination systems. In Proceedings Graphics Interface '91, pages 117--128, Calgary, June 1991.

....part of the paper discusses attributes in hierarchical scene descriptions using a new object oriented approach. 1 Introduction Object oriented techniques have been successfully used in many disciplines of computer graphics, especially in the design and the implementation of rendering systems [13, 25, 21, 8, 17]. However, there have been several areas, in which the application of object oriented techniques has been unsatisfactory. The problems encountered were mostly related to the problem of expressing relationships between objects. There are several occurrences of this problem in image synthesis. The ....

Peter Shirley and Kelvin Sung. A ray tracing framework for global illumination systems. In Proceedings Graphics Interface '91, pages 117--128, Calgary, June 1991.

....[8] It introduced the basic structure for the uniform handling of geometric objects and shaders as abstract objects in the architecture. Most of the later architectures, including Vision, use many of these ideas. Shirley proposed an object oriented Ray Tracing Framework for Global Illumination [9]. This framework is built on ray tracing and Monte Carlo integration as the single global illumination technique. Supporting other solution techniques like finite elements would probably be difficult within this framework. The Cornell Testbed for Image Synthesis [10] is a functional decomposition ....

P. Shirley and K. Sung, "A ray tracing framework for global illumination systems," in Proceedings Graphics Interface '91, (Calgary) , pp. 117--128, June 1991.

....the behavior of materials in the real world [14] In a conventional ray tracer the values of kd , ks and k t can be hand tuned to depend on viewpoint but in an interactive setting this does not work well. Instead, we first break down materials into a few distinct subjective categories suggested in [31]: diffuse, dielectric, metal, and polished. The modifications for these materials is described below: Diffuse. For diffuse surfaces we use Equation 1 with kh = ks = k t = 0. This is the same as a conventional ray tracer. eye luminaire x n r t e Figure 7: The directional ....

Peter Shirley, Kelvin Sung, and William Brown. A ray tracing framework for global illumination systems. In Proceedings of Graphics Interface '91, pages 117--128, June 1991.

....function that will be reemitted. In the viewing stage, this distribution can be queried with results depending on viewer position. The distribution functions could be stored in a Hemicube as done by Immel et al. 22] as spherical harmonics as done in [6, 51] or in hemispherical tables as done in [16, 41, 47]. These latter methods use Monte Carlo by generating outgoing power rays according to the shape of the unemitted power function as shown in Figure 6. My experience has been that non diffuse radiosity does not work well for near mirrors because more zones are needed (the surfaces have detail ....

....3. Generate a radiosity solution on a low resolution environment and use this in the viewing phase. In method 1 the ray tracing is really just to accurately capture specular effects [57] and the radiosity phase my or may not include specular transport [32, 52] or directional diffuse transport [41, 47, 51]. Any problems with the meshing in high gradient areas will be very obvious in method 1, so some form of discontinuity meshing should be used [31] In method 2 the fine detail caused by shadows (see Figure 10) is handled in the direct phase and the indirect lighting is handled by some precomputed ....

Peter Shirley, Kelvin Sung, and William Brown. A ray tracing framework for global illumination systems. In Proceedings of Graphics Interface '91, pages 117--128, June 1991.

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Shirley, Peter, Kelvin Sung, and William Brown. "A Ray Tracing Framework for Global Illumination Systems." Graphics Interface '90, p. 117-128 f75g

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