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Intersection
Kinds of Intersection Terms modified by Intersection Selected AbstractsDEFINING STANDARD OF CARE IN THE DEVELOPING WORLD: THE INTERSECTION OF INTERNATIONAL RESEARCH ETHICS AND HEALTH SYSTEMS ANALYSISDEVELOPING WORLD BIOETHICS, Issue 2 2005ADNAN A. HYDER ABSTRACT In recent years there has been intense debate regarding the level of medical care provided to ,standard care' control groups in clinical trials in developing countries, particularly when the research sponsors come from wealthier countries. The debate revolves around the issue of how to define a standard of medical care in a country in which many people are not receiving the best methods of medical care available in other settings. In this paper, we argue that additional dimensions of the standard of care have been hitherto neglected, namely, the structure and efficiency of the national health system. The health system affects locally available medical care in two important ways: first, the system may be structured to provide different levels of care at different sites with referral mechanisms to direct patients to the appropriate level of care. Second, inefficiencies in this system may influence what care is available in a particular locale. As a result of these two factors locally available care cannot be equated with a national ,standard'. A reasonable approach is to define the national standard of care as the level of care that ought to be delivered under conditions of appropriate and efficient referral in a national system. This standard is the minimum level of care that ought to be provided to a control group. There may be additional moral arguments for higher levels of care in some circumstances. This health system analysis may be helpful to researchers and ethics committees in designing and reviewing research involving standard care control groups in developing country research. [source] INTERACTION AND INTERSECTION: THE CONSTELLATION OF EMOTIONAL STABILITY AND EXTRAVERSION IN PREDICTING PERFORMANCEPERSONNEL PSYCHOLOGY, Issue 3 2007TIMOTHY A. JUDGE This study investigated the constellation of 2 Big 5 traits,Emotional Stability and Extraversion,in predicting job performance. Two forms of the constellation, one indirect (a statistical interaction) and the other direct (a measure of the intersection between the traits from the Big 5 circumplex), were used to predict job performance. Data were collected from employees and their supervisors at a regional health and fitness center. Results indicated that both measures predicted performance, even when controlling for the "main effects" of Emotional Stability and Extraversion, as well as 2 other relevant Big 5 traits (Agreeableness and Conscientiousness). These results suggest that the combination of Emotional Stability and Extraversion,reflecting a "happy" or "buoyant" personality,may be more important to performance than either trait in isolation. [source] THE INTERSECTIONS OF GENDER AND GENERATION IN ALBANIAN MIGRATION, REMITTANCES AND TRANSNATIONAL CAREGEOGRAFISKA ANNALER SERIES B: HUMAN GEOGRAPHY, Issue 1 2009Russell King ABSTRACT. The Albanian case represents the most dramatic instance of post-communist migration: about one million Albanians, a quarter of the country's total population, are now living abroad, most of them in Greece and Italy, with the UK becoming increasingly popular since the late 1990s. This paper draws on three research projects based on fieldwork in Italy, Greece, the UK and Albania. These projects have involved in-depth interviews with Albanian migrants in several cities, as well as with migrant-sending households in different parts of Albania. In this paper we draw out those findings which shed light on the intersections of gender and generations in three aspects of the migration process: the emigration itself, the sending and receiving of remittances, and the care of family members (mainly the migrants' elderly parents) who remain in Albania. Theoretically, we draw on the notion of ,gendered geographies of power' and on how spatial change and separation through migration reshapes gender and generational relations. We find that, at all stages of the migration, Albanian migrants are faced with conflicting and confusing models of gender, behavioural and generational norms, as well as unresolved questions about their legal status and the likely economic, social and political developments in Albania, which make their future life plans uncertain. Legal barriers often prevent migrants and their families from enjoying the kinds of transnational family lives they would like. [source] Purity, Soul Food, and Sunni Islam: Explorations at the Intersection of Consumption and ResistanceCULTURAL ANTHROPOLOGY, Issue 2 2004Carolyn Rouse ABSTRACT Contemporary African American followers of Sunni Islam are self-consciously articulating a form of eating that they see as liberating them from the heritage of slavery, while also bringing them into conformity with Islamic notions of purity. In so doing, they participate in arguments about the meaning of "soul food," the relation between "Western" materialism and "Eastern" spirituality, and bodily health and its relation to mental liberation. Debates within the African American Muslim community show us how an older anthropological concern with food taboos can be opened up to history and to the experience of the past reinterpreted in terms of the struggles of the present. [source] Introduction to the Special Collection on the Intersection of Families and the Law,FAMILY RELATIONS, Issue 4 2002Tammy L. Henderson First page of article [source] Contact metamorphic P,T,t paths from Sm,Nd garnet ages, phase equilibria modelling and thermobarometry: Garnet Ledge, south-eastern Alaska, USAJOURNAL OF METAMORPHIC GEOLOGY, Issue 6 2001H. H. Stowell Abstract Sm,Nd garnet-whole rock geochronology, phase equilibria, and thermobarometry results from Garnet Ledge, south-eastern Alaska, provide the first precisely constrained P,T,t path for garnet zone contact metamorphism. Garnet cores from two crystals and associated whole rocks yield a four point isochron age for initial garnet growth of 89.9 ± 3.6 Ma. Garnet rims and matrix minerals from the same samples yield a five point isochron age for final garnet growth of 89 ± 1 Ma. Six size fractions of zircon from the adjacent pluton yield a concordant U,Pb age of 91.6 ± 0.5 Ma. The garnet core and rim, and zircon ages are compatible with single-stage garnet growth during and/or after pluton emplacement. All garnet core,whole rock and garnet rim-matrix data from the two samples constrain garnet growth duration to ,5.5 my. A garnet mid-point and the associated matrix from one of the two garnet crystals yield an age of 90.0 ± 1.0 Ma. This mid-point result is logically younger than the 90.7 ± 5.6 Ma core,whole rock age and older than the 88.4 ± 2.5 Ma rim-matrix age for this sample. A MnNaCaKFMASH phase diagram (P,T pseudosection) and the garnet core composition are used to predict that cores of garnet crystals grew at 610 ± 20 °C and 5 ± 1 kbar. This exceeds the temperature of the garnet-in reaction by c. 50 °C and is compatible with overstepping of the garnet growth reaction during contact metamorphism. Intersection of three reactions involving garnet-biotite-sillimanite-plagioclase-quartz calculated by THERMOCALC in average P,T mode, and exchange thermobarometry were used to estimate peak metamorphic conditions of 678 ± 58 °C at 6.1 ± 0.9 kbar and 685 ± 50 °C at 6.3 ± 1 kbar, respectively. Integration of pressure, temperature, and age estimates yields a pressure-temperature-time path compatible with near isobaric garnet growth over an interval of c. 70 °C and c. 2.3 my. [source] Intersection between metabolic dysfunction, high fat diet consumption, and brain agingJOURNAL OF NEUROCHEMISTRY, Issue 2 2010Romina M. Uranga J. Neurochem. (2010) 114, 344,361. Abstract Deleterious neurochemical, structural, and behavioral alterations are a seemingly unavoidable aspect of brain aging. However, the basis for these alterations, as well as the basis for the tremendous variability in regards to the degree to which these aspects are altered in aging individuals, remains to be elucidated. An increasing number of individuals regularly consume a diet high in fat, with high-fat diet consumption known to be sufficient to promote metabolic dysfunction, although the links between high-fat diet consumption and aging are only now beginning to be elucidated. In this review we discuss the potential role for age-related metabolic disturbances serving as an important basis for deleterious perturbations in the aging brain. These data not only have important implications for understanding the basis of brain aging, but also may be important to the development of therapeutic interventions which promote successful brain aging. [source] Examining the Intersection of Sex and Stress in Modelling Neuropsychiatric DisordersJOURNAL OF NEUROENDOCRINOLOGY, Issue 4 2009N. Goel Sex-biased neuropsychiatric disorders, including major depressive disorder and schizophrenia, are the major cause of disability in the developed world. Elevated stress sensitivity has been proposed as a key underlying factor in disease onset. Sex differences in stress sensitivity are associated with corticotrophin-releasing factor (CRF) and serotonin neurotransmission, which are important central regulators of mood and coping responses. To elucidate the underlying neurobiology of stress-related disease predisposition, it is critical to develop appropriate animal models of stress pathway dysregulation. Furthermore, the inclusion of sex difference comparisons in stress responsive behaviours, physiology and central stress pathway maturation in these models is essential. Recent studies by our laboratory and others have begun to investigate the intersection of stress and sex where the development of mouse models of stress pathway dysregulation via prenatal stress experience or early-life manipulations has provided insight into points of developmental vulnerability. In addition, examination of the maturation of these pathways, including the functional importance of the organisational and activational effects of gonadal hormones on stress responsivity, is essential for determination of when sex differences in stress sensitivity may begin. In such studies, we have detected distinct sex differences in stress coping strategies where activational effects of testosterone produced females that displayed male-like strategies in tests of passive coping, but were similar to females in tests of active coping. In a second model of elevated stress sensitivity, male mice experiencing prenatal stress early in gestation showed feminised physiological and behavioural stress responses, and were highly sensitive to a low dose of selective serotonin reuptake inhibitors. Analyses of expression and epigenetic patterns revealed changes in CRF and glucocorticoid receptor genes in these mice. Mechanistically, stress early in pregnancy produced a significant sex-dependent effect on placental gene expression that was supportive of altered foetal transport of key growth factors and nutrients. These mouse models examining alterations and hormonal effects on development of stress pathways provide necessary insight into how specific stress responses can be reprogrammed early in development resulting in sex differences in stress sensitivity and neuropsychiatric disease vulnerability. [source] That Way Madness Lies: At the Intersection of Philosophy and Clinical PsychologyMETAPHILOSOPHY, Issue 5 2004Jennifer Mundale Abstract: I argue that philosophical practice is a clinically active and influential endeavor, with both positive (therapeutic) and negative (detrimental) psychological possibilities. Though some have explicitly taken the clinical aspects of philosophy into the therapeutic realm via the new field of philosophical counseling, I am interested in the clinical context of philosophers as philosophers, engaged in standard, philosophical pursuits. In arguing for the clinical implications of philosophical practice I consider the relation between philosophical despair and depression, the cognitive etiology of depression and other clinical disorders, selected DSM-IV entries, attribution theory, and cognitive therapy. [source] Informed Consent: Documenting the Intersection of Bureaucratic Regulation and Ethnographic PracticePOLAR: POLITICAL AND LEGAL ANTHROPOLOGY REVIEW, Issue 2 2007Jennifer Shannon Standardized institutional review board (IRB) procedures suggest that informed consent can be enacted in the same way everywhere,across disciplines and across different cultural communities. With attention to documents as artifacts and embedding ethics, I consider consent documents to be located at a productive site for anthropological analysis the intersection of bureaucratic and ethnographic practice. Through fieldwork that engaged both American Indians in Chicago and museum professionals in Washington, D.C., I was able to view these procedures in a variety of contexts. Unlike the joking references to IRB scripts when interviewing museum professionals, American Indians were wary of such procedures. The particular meaning attached to signing documents varied in these communities and in one case prompted people to challenge and change the consent protocol that I would use in my fieldwork practice. This comparative approach shows how different institutions are represented by and transact through documents in ways that significantly impact the nature of fieldwork relations. [source] Equity at the Intersection: Public Administration and the Study of GenderPUBLIC ADMINISTRATION REVIEW, Issue 3 2009Domonic A. Bearfield While gender has emerged as an important research subject, the development of a feminist theory has been slow. This paper calls for a commitment to the development of a feminist theory of public administration. As part of this development, the author argues that the field also must embrace research focused on the intersection of multiple identity categories such as race and class. [source] Organizing Moments: Intersection of Union Campaigns and Linguistic AnalysisANTHROPOLOGY OF WORK REVIEW, Issue 3-4 2003David Kamper First page of article [source] Exact and Robust (Self-)Intersections for Polygonal MeshesCOMPUTER GRAPHICS FORUM, Issue 2 2010Marcel Campen Abstract We present a new technique to implement operators that modify the topology of polygonal meshes at intersections and self-intersections. Depending on the modification strategy, this effectively results in operators for Boolean combinations or for the construction of outer hulls that are suited for mesh repair tasks and accurate mesh-based front tracking of deformable materials that split and merge. By combining an adaptive octree with nested binary space partitions (BSP), we can guarantee exactness (= correctness) and robustness (= completeness) of the algorithm while still achieving higher performance and less memory consumption than previous approaches. The efficiency and scalability in terms of runtime and memory is obtained by an operation localization scheme. We restrict the essential computations to those cells in the adaptive octree where intersections actually occur. Within those critical cells, we convert the input geometry into a plane-based BSP-representation which allows us to perform all computations exactly even with fixed precision arithmetics. We carefully analyze the precision requirements of the involved geometric data and predicates in order to guarantee correctness and show how minimal input mesh quantization can be used to safely rely on computations with standard floating point numbers. We properly evaluate our method with respect to precision, robustness, and efficiency. [source] Detecting Cycle Failures at Signalized Intersections Using Video Image ProcessingCOMPUTER-AIDED CIVIL AND INFRASTRUCTURE ENGINEERING, Issue 6 2006Jianyang Zheng Cycle failure detection is essential for identifying signal control problems at intersections. However, typical traffic sensors do not have the capability of capturing cycle failures. In this article, we introduce an algorithm for traffic signal cycle failure detection using video image processing. A cycle failure for a particular movement occurs when at least one vehicle must wait through more than one red light to complete the intended movement. The proposed cycle failure algorithm was implemented using Microsoft Visual C#. The system was tested with field data at different locations and time periods. The test results show that the algorithm works favorably: the system captured all the cycle failures and generated only three false alarms, which is approximately 0.9% of the total cycles tested. [source] Intersections: Family and Consumer Sciences and Cultural DiversityFAMILY & CONSUMER SCIENCES RESEARCH JOURNAL, Issue 3 2009Ruben P. Viramontez Anguiano Guest Editor First page of article [source] Ida Vera Simonton's Imperial Masquerades: Intersections of Gender, Race and African Expertise in Progressive-Era AmericaGENDER & HISTORY, Issue 2 2010Jeremy Rich Ida Vera Simonton, a New York socialite, visited the French colony of Gabon in 1906 and 1907. Her subsequent narratives about her stay demonstrate a very ambiguous view of the horrors of European colonialism that she claimed to despise and the amoral nature of Africans. Simonton ultimately employed her stay in Gabon to claim a right to form female self-defence squads in New York and to act as an independent defender of white women. By carefully shaping her public persona to alternately appropriate discourses of masculine regeneration through empire and to highlight her female vulnerability, she made herself into a provocative spectacle. In an ironic twist, given how much Simonton embellished on her own experiences, Broadway producers in 1925 plagiarised her 1912 novel Hell's Playground in their successful play White Cargo. Simonton successfully sued for damages, thus upholding her highly edited version of her trip in law. Her writings expose the intersections of racial anxieties, gendered visions of empire and feminist aspirations in the United States during the Progressive era. [source] Intersections: The Simultaneity of Race, Gender and Class in Organization StudiesGENDER, WORK & ORGANISATION, Issue 3 2010Evangelina Holvino This article argues for a reconceptualization of the intersections of race, gender and class as simultaneous processes of identity, institutional and social practice in order to redress the lack of attention to these intersections in feminist organization studies. Grounding my argument on a brief critique of white liberal feminism from the perspective of women of colour, I examine other feminist frameworks beyond the dominant liberal paradigm and identify their possible contributions to the study of intersections in organization theory and practice. Specifically, I propose theoretical and methodological interventions for researching and practicing more forcefully and intentionally the simultaneity of race, gender and class in organizations, including researching and publicizing the hidden stories at the intersections of race, ethnicity, gender, class, nation and sexuality; identifying, untangling and changing the differential impact of everyday practices in organizations and identifying and linking internal organizational processes with external societal processes. I conclude with some reflections on the possible implications of these proposals for each of us, scholars and practitioners of gender and organization. [source] The Place of Islam in the Geography of Religion: Trends and IntersectionsGEOGRAPHY COMPASS (ELECTRONIC), Issue 5 2007Richard Gale This article reviews recent geographical research on Islam and Muslim identities. In the wake of the events of 11 September 2001, the forms taken by public debate surrounding Muslim communities and societies have been manifold and not always edifying. In the present political climate, where public attitudes to a particular suite of issues are often as misinformed as they are deeply held, the need for academics to furnish insights born out of robust research is acute. While the responses of academics to debates coalescing around Muslim communities and identities have emanated predominantly from religious studies, sociology and anthropology, geographers, with their attention to the spatial components inherent to the articulation of social identities, are making an increasingly significant contribution to our knowledge in this field. This article reviews this contribution, focusing on four areas in which geographical research on Islam has been most pronounced: Muslim residential segregation and ,community cohesion'; the relationship between Islamic dress codes and spatial context in the articulation of Muslim gender identities; the contestation of space that has attended the architectural expression of Muslim identity in urban landscapes and the spatial politics embedded in the construction of Muslim identities at simultaneously national and transnational scales. While the predominant focus is therefore geographical, the article also establishes linkages to other writings on the spatiality of Islam where relevant to the specific themes under discussion. [source] Re-engaging the Intersections of Media, Politics and Cities , Introduction to a DebateINTERNATIONAL JOURNAL OF URBAN AND REGIONAL RESEARCH, Issue 1 2009SCOTT RODGERS Within contemporary social theory and social science, urban and media studies are seen as zones of speciality, with distinctive theoretical traditions and substantive concerns. This introduction situates the four short essays making up this Debates and Developments section in relation to a recent interdisciplinary workshop held in June 2008 at The Open University in Milton Keynes, UK, where participants were encouraged to experiment with and rework the longstanding conceptual differences and disciplinary policing that so often sets apart media and urban studies. The essays showcased here focus on the theoretical approaches urban scholars might bring to bear on studies of how cities and media come together around matters of politics. Résumé Dans le cadre de la théorie sociale contemporaine et des sciences sociales, les études urbaines et relatives aux médias sont considérées comme des domaines de spécialité assortis de traditions théoriques et de préoccupations majeures distinctes. Cette introduction situe les quatre courtes contributions aux ,Débats et développements' par rapport à un récent séminaire interdisciplinaire qui s'est tenu en juin 2008 à l'Open University de Milton Keynes, en Angleterre. Les participants y étaient invités àéprouver et remanier les divergences conceptuelles persistantes et l'ordre disciplinaire qui, si souvent, séparent études urbaines et études sur les médias. Les textes présentés ici portent principalement sur les approches théoriques que la recherche urbaine pourrait mettre en oeuvre pour étudier comment villes et médias se rejoignent autour de sujets de politique. [source] Factors contributing to the severity of intersection crashesJOURNAL OF ADVANCED TRANSPORTATION, Issue 3 2007Richard Tay Abstract Road crashes are a leading cause of death and serious injuries both developed and developing countries. Intersections are recognized as being among the most hazardous locations on the roads. Although crashes at intersections form about 35 % of the reported accidents account for about 32% of traffic-related serious injuries and fatalities in Singapore, there is no known study that examines the factors contributing to the severity of these crashes. In this study, the ordinal probit model was applied to crash data from 1992 to 2002 to investigate the role a variety of factors play in determining the severity of intersection crashes. Our study shows that vehicle type, road type, collision type, driver's characteristics and time of day are important determinants of the severity of crashes at intersections in Singapore. [source] Disciplines, Intersections, and the Future of Communication ResearchJOURNAL OF COMMUNICATION, Issue 4 2008Susan Herbst First page of article [source] Empirical Intersections in Communication Research: Replication, Multiple Quantitative Methods, and Bridging the Quantitative,Qualitative DivideJOURNAL OF COMMUNICATION, Issue 4 2008William L. Benoit First page of article [source] Medical Anthropology at the IntersectionsMEDICAL ANTHROPOLOGY QUARTERLY, Issue 3 2007Marcia C. Inhorn First page of article [source] Carolina in the Carolines: A Survey of Patterns and Meanings of Smoking on a Micronesian IslandMEDICAL ANTHROPOLOGY QUARTERLY, Issue 4 2005Mac Marshall Tobacco use---especially smoking industrially manufactured cigarettes---kills nearly 5 million people annually and is the leading preventable cause of death worldwide. Tobacco is a widely used global commodity embedded in cultural meanings, and its consumption involves a set of learned, patterned social behaviors. Seemingly, then, tobacco offers a most appealing anthropological research topic, yet its study has been relatively ignored by medical anthropologists when compared to research on alcoholic beverages and illegal drugs. To help fill this gap, this article sketches the historical background of tobacco in Micronesia, presents the results of a cross-sectional smoking survey from Namoluk Atoll, and describes contemporary smoking patterns and locally understood symbolic associations of tobacco. Intersections among history, gender, local meanings, the health transition, and the transnational marketing of tobacco are addressed, and cigarette smoking is seen as part of a new syndemic of chronic diseases in Micronesia. [source] Arts, Theology, and the Church: New Intersections , Edited by Kimberly Vrudny and Wilson YatesRELIGIOUS STUDIES REVIEW, Issue 1 2007David W. Johnson No abstract is available for this article. [source] Merging sex and positionBIOESSAYS, Issue 4 2001Daniel Bopp The choice between male and female development arises from a simple blnary decision made in early development. Studies in a few model organlsms led to a detalled understanding of the regulatory mechanisms that convey male or female identity at the cellular level. We have learned little, however, of how this information translates into the actual sexual phenotype with regionally dlmorphic characters. Where does positional information come from and how does it integrate with the sexdetermining pathway? A recent report sheds light onto this enigma and reveals possible intersections between sex-determining and homeotic pathways in Drosophila. Such Intersections may also play an important part in evolution, provlding a basis for phenotypic diversity among related specles. BioEssays 23:304-306,2001. ©2001 John Wiley & Sons, Inc. [source] Coherence aware GPU-based ray casting for virtual colonoscopyCOMPUTER ANIMATION AND VIRTUAL WORLDS (PREV: JNL OF VISUALISATION & COMPUTER ANIMATION), Issue 1 2009Taek Hee Lee Abstract In this paper, we propose a GPU-based volume ray casting for virtual colonoscopy to generate high-quality rendering images with a large screen size. Using the temporal coherence for ray casting, the empty space leaping can be efficiently done by reprojecting first-hit points of the previous frame; however, these approaches could produce artifacts such as holes or illegal starting positions due to the insufficient resolution of first-hit points. To eliminate these artifacts, we use a triangle mesh of first-hit points and check the intersection of each triangle with the corresponding real surface. Illegal starting positions can be avoided by replacing a false triangle cutting the real surface with five newly generated triangles. The proposed algorithm is best fit to the recent GPU architecture with Shader Model 4.0 which supports not only fast rasterization of a triangle mesh but also many flexible vertex operations. Experimental results on ATI 2900 with DirectX10 show perspective volume renderings of over 24fps on 1024,×,1024 screen size without any loss of image quality. Copyright © 2008 John Wiley & Sons, Ltd. [source] Isotropic Remeshing with Fast and Exact Computation of Restricted Voronoi DiagramCOMPUTER GRAPHICS FORUM, Issue 5 2009Dong-Ming Yan Abstract We propose a new isotropic remeshing method, based on Centroidal Voronoi Tessellation (CVT). Constructing CVT requires to repeatedly compute Restricted Voronoi Diagram (RVD), defined as the intersection between a 3D Voronoi diagram and an input mesh surface. Existing methods use some approximations of RVD. In this paper, we introduce an efficient algorithm that computes RVD exactly and robustly. As a consequence, we achieve better remeshing quality than approximation-based approaches, without sacrificing efficiency. Our method for RVD computation uses a simple procedure and a kd -tree to quickly identify and compute the intersection of each triangle face with its incident Voronoi cells. Its time complexity is O(mlog n), where n is the number of seed points and m is the number of triangles of the input mesh. Fast convergence of CVT is achieved using a quasi-Newton method, which proved much faster than Lloyd's iteration. Examples are presented to demonstrate the better quality of remeshing results with our method than with the state-of-art approaches. [source] Shallow Bounding Volume Hierarchies for Fast SIMD Ray Tracing of Incoherent RaysCOMPUTER GRAPHICS FORUM, Issue 4 2008H. Dammertz Abstract Photorealistic image synthesis is a computationally demanding task that relies on ray tracing for the evaluation of integrals. Rendering time is dominated by tracing long paths that are very incoherent by construction. We therefore investigate the use of SIMD instructions to accelerate incoherent rays. SIMD is used in the hierarchy construction, the tree traversal and the leaf intersection. This is achieved by increasing the arity of acceleration structures, which also reduces memory requirements. We show that the resulting hierarchies can be built quickly and are smaller than acceleration structures known so far while at the same time outperforming them for incoherent rays. Our new acceleration structure speeds up ray tracing by a factor of 1.6 to 2.0 compared to a highly optimized bounding interval hierarchy implementation, and 1.3 to 1.6 compared to an efficient kd-tree. At the same time, the memory requirements are reduced by 10,50%. Additionally we show how a caching mechanism in conjunction with this memory efficient hierarchy can be used to speed up shadow rays in a global illumination algorithm without increasing the memory footprint. This optimization decreased the number of traversal steps up to 50%. [source] ReduceM: Interactive and Memory Efficient Ray Tracing of Large ModelsCOMPUTER GRAPHICS FORUM, Issue 4 2008Christian Lauterbach We present a novel representation and algorithm, ReduceM, for memory efficient ray tracing of large scenes. ReduceM exploits the connectivity between triangles in a mesh and decomposes the model into triangle strips. We also describe a new stripification algorithm, Strip-RT, that can generate long strips with high spatial coherence. Our approach uses a two-level traversal algorithm for ray-primitive intersection. In practice, ReduceM can significantly reduce the storage overhead and ray trace massive models with hundreds of millions of triangles at interactive rates on desktop PCs with 4-8GB of main memory. [source] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||