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Dissertations / Theses on the topic 'Raytracing'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Straňák, Marek. "Raytracing na GPU." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2011. http://www.nusl.cz/ntk/nusl-237020.

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Raytracing is a basic technique for displaying 3D objects. The goal of this thesis is to demonstrate the possibility of implementing raytracer using a programmable GPU. The algorithm and its modified version, implemented using "C for CUDA" language, are described. The raytracer is focused on displaying dynamic scenes. For this purpose the KD tree structure, bounding volume hierarchies and PBO transfer are used. To achieve realistic output, photon mapping was implemented.

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2

Novák, David. "Raytracing pro GPUEngine." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2019. http://www.nusl.cz/ntk/nusl-403122.

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The main goal of this thesis is ray tracing optimization, especially with the use of acceleration data structure. It'll be focused on discretion about various structure build strategies and their traversal. Different algorithms on the CPU and on the GPU will be implemented and compared in the thesis, specifically will be compared the speed of build and final structure quality, which have a direct influence on ray tracing performance. A ray tracing application will be implemented for the purpose of the acceleration structure quality test. A part with acceleration structure building will be adde

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3

Rypák, Andrej. "Raytracing virtuálních grafických scén." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2012. http://www.nusl.cz/ntk/nusl-236470.

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This thesis is dedicated to ray tracing based rendering methods, primarily the original ray tracing. Besides introducing a brief historical overview of algorithms from the family, it presents all the essential tools, techniques and physics needed for designing a rendering application in detail. A significant part of the document consists of an implementation of a photorealistic rendering application for interactive graphics 3D virtual scenes. The focus is on rendering without using any additional model information. The thesis includes descriptions and explanations of specific problems and thei

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4

Stolz, Oliver. "Differentielles Raytracing für spezielle Beleuchtungssysteme." kostenfrei, 2010. http://d-nb.info/1000822028/34.

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5

Polášek, Tomáš. "Hybridní raytracing v rozhraní DXR." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2019. http://www.nusl.cz/ntk/nusl-403161.

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The goal of this thesis is to evaluate the usability of hardware accelerated ray tracing in near-future rendering engines. Specifically, DirectX Ray Tracing API and Nvidia Turing architecture are being examined. Design and implementation of a hybrid rendering engine with support for hardware accelerated ray tracing is included and used in implementation of frequently used graphical effects -- hard and soft shadows, reflections, and Ambient Occlusion. The assessment is made in terms of difficulty of integration into a rendering engine, performance of the resulting system and suitability of impl

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Anders, Jörg. "3D-Welten selbstgemacht - Raytracing mit POVRAY." Universitätsbibliothek Chemnitz, 1998. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-199800286.

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7

Teitel, Michael A. (Michael Albert). "Anamorphic raytracing for synthetic alcove holographic stereograms." Thesis, Massachusetts Institute of Technology, 1986. http://hdl.handle.net/1721.1/14760.

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8

Ghavamian, Pooria. "Real-time Raytracing and Screen-space Ambient Occlusion." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-254990.

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This paper investigates the advances in real-time ambient occlusion (AO). Topics discussed are state-of-the-art screen-space techniques and raytraced ambient occlusion. Methods compared are our screen-space ambient occlusion (SSAO) variant, horizon-based ambient occlusion(HBAO), Unity’s scalable AO (AlchemyAO), multi-scale volumetric AO (MSVO), and raytraced AO (RTAO). The methods were compared based on the errors produced in dynamic scenes, performance and similarity to reference scenes rendered by an offline raytracer. Important dynamic scene errors were highlighted, visual results were obje

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9

Gioia, Chehade Stefano. "Plataforma de depurado para renderizadores basados en raytracing." Tesis, Universidad de Chile, 2019. http://repositorio.uchile.cl/handle/2250/170910.

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Memoria para optar al título de Ingeniero Civil en Computación<br>Encontrar un error en una aplicación gráfica mediante las herramientas de depurado que proveen los lenguajes de programación convencionales suele no ser una tarea fácil. En este trabajo se propone un método y se implementa una solución para llevar a cabo el depurado de aplicaciones que utilizan raytracing como técnica de renderizado. En concreto, se describe el diseño y construcción de una plataforma web que permite la carga, manipulación y visualización de rayos a través de un esquema particular, que consta de propiedades

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10

Cichocki, Myriam [Verfasser]. "Raytracing basierte Intraokularlinsen-Kalkulation nach refraktiver Hornhautchirurgie / Myriam Cichocki." Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky, 2020. http://d-nb.info/1228076316/34.

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Lehmann, Anne-Isabel [Verfasser]. "Intraokularlinsenkalkulation: Vergleich zwischen "Goldstandard" IOL Master und okulärem Raytracing / Anne-Isabel Lehmann." Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky, 2020. http://d-nb.info/1225041945/34.

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12

Parikh, Sanjiv D. "Computerized Ultrasonic Raytracing Model for C-scans of Solid Steel Bridge Pins." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/37054.

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This report describes the results of computerized ultrasonic C-scanning of solid steel bridge pins using a raytrace model. The raytrace model was developed to facilitate interpretation of data obtained from an ultrasonic C-scanning system for the Virginia Transportation Research Council (VTRC). The report discusses the reasons behind the development of the raytrace model, as well as specifications of the model, the input conditions, and the data output and visualization. The model uses as input, various "boundary" conditions of the solid steel pin with reduced diameter pin ends, as well as siz

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13

Dvořák, Jakub. "Streaming Ray Tracer na GPU." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2008. http://www.nusl.cz/ntk/nusl-236008.

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Current consumer GPUs can be used as high performance stream processors and are a tempting platform to be used to implement raytracing. In this paper I briefly present raytracing principles and methods used to accelerate it, modern GPUs programmable pipeline and examples of its use. I describe stream processing in general and available interfaces enabling the usage of GPU as stream processor. Then I present my GPU raytracer implementation, used algorithms and experiments I have made.

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14

O'Brien, Simon R. M. "Adaptive raytracing-based suppression of severe water-bottom multiples in marine seismic data." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0002/NQ42483.pdf.

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15

Hughes, David Meirion. "Kd-Jump : a Path-Preserving Stackless Traversal for Faster Isosurface Raytracing on GPUs." Thesis, Bangor University, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.520842.

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16

Lai, Khai Ping. "A deep learning model for automatic image texture classification: Application to vision-based automatic aircraft landing." Thesis, Queensland University of Technology, 2016. https://eprints.qut.edu.au/97992/4/Khai_Ping_Lai_Thesis.pdf.

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This project aims to investigate a robust Deep Learning architecture to classify different type of textural imagery. The findings will eventually be part of a central processing algorithm used for Automatic Image Classification for Automatic Aircraft Landing.

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17

Tzimeas, Constantinos. "Image resolution analysis: a new, robust approach to seismic survey design." Diss., Texas A&M University, 2005. http://hdl.handle.net/1969.1/2431.

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Seismic survey design methods often rely on qualitative measures to provide an optimal image of their objective target. Fold, ray tracing techniques counting ray hits on binned interfaces, and even advanced 3-D survey design methods that try to optimize o?set and azimuth coverage are prone to fail (especially in complex geological or structural settings) in their imaging predictions. The reason for the potential failure of these commonly used approaches derives from the fact that they do not take into account the ray geometry at the target points. Inverse theory results can provide quantitati

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18

Lysek, Tomáš. "Fotorealistické zobrazování metodou "Photon Mapping"." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2015. http://www.nusl.cz/ntk/nusl-234915.

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This master thesis focuses on photon mapping rendering technique. A simple photon mapping was implemented as a baseline and then progressive photon mapping was prepared for CPU and GPU. After implementing progressive photon mapping on GPU, further acceleration techniques were proposed. Finally, in the thesis, genetic clustering algorithm for suitable clusters on GPU was proposed.

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Wodniok, Dominik Maximilian [Verfasser], Michael [Akademischer Betreuer] Goesele, and Carsten [Akademischer Betreuer] Dachsbacher. "Higher Performance Traversal and Construction of Tree-Based Raytracing Acceleration Structures / Dominik Maximilian Wodniok ; Michael Goesele, Carsten Dachsbacher." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2019. http://d-nb.info/1189816547/34.

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20

Семененко, А. І. "Метод формування зображень об’єктів з урахуванням трасування променів світла". Thesis, Чернігів, 2020. http://ir.stu.cn.ua/123456789/23359.

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Семененко, А. І. Метод формування зображень об’єктів з урахуванням трасування променів світла : випускна кваліфікаційна робота : 123 "Комп’ютерна інженерія" / А. І. Семененко ; керівник роботи В. В. Казимир ; НУ "Чернігівська політехніка", кафедра інформаційних і комп’ютерних систем. – Чернігів, 2020. – 128 с.<br>Об'єктом розробки є метод формування зображень об’єктів з урахування трасування променів світла. Результатом роботи є реалізація таких можливостей додатку:  використання API DXR та DirectX 12;  створення бібліотеки методу трасування променів світла;  інтегрування та підключення

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21

Asgharzadeh, Shishavan Amir. "Bifacial photovoltaic (PV) system performance modeling utilizing ray tracing." Diss., University of Iowa, 2019. https://ir.uiowa.edu/etd/6911.

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Bifacial photovoltaics (PV) is a promising technology which allows solar cells to absorb light and generate power from both front and rear sides of the cells. Bifacial PV systems generate more power per area compared to their monofacial counterparts because of the additional energy generated from the backside. However, modeling the performance of bifacial PV systems is more challenging than monofacial systems and industry requires novel and accurate modeling tools to understand and estimate the benefit of this technology. In this dissertation, a rigorous model utilizing a backward raytracing s

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22

Fabík, Jiří. "Realistická vizualizace alkoholických nápojů pomocí distribuovaného raytracingu." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2013. http://www.nusl.cz/ntk/nusl-236392.

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This work is about a realistic visualization technique called raytracing. It studies its original form, its extensions and optimizations. Raytracing casts rays through pixels and follows their propagation in the scene, according to the physical laws. It enables rendering of correct shadows, reflections and refractions. Distributed raytracing serves for better visualization and advanced effects. One ray is replaced with a beam of rays that allows soft shadows, fuzzy translucency, depth of field and antialiasing. With the increasing number of rays, the render time rises as well, so it is needed

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23

Kalinka, Tatjana. "Spindulių trasavimas ir padalijimo paviršiai." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2006~D_20140702_194034-64449.

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Spindulių trasavimas ir padalijimo paviršiai yra svarbūs įrankiai realistiškai atrodantiems vaizdams generuoti. Padalijimas – tai algoritmas, leidžiantis gauti glotnius paviršius pakartotinai dalijant gardeles. Spindulių trasavimas yra technologija, kuri remiasi apšvietimo skaičiavimu. Jos dėka galima gauti atspindžius, permatomumą, spindulių lūžimą kertant skaidrius objektus, taipogi realistiškus šešėlius. Mūsų darbo tikslas buvo suderinti šiuos du metodus, kuriant programinę priemonę, kuri leistų gauti sudėtingų objektų idealiai glotnius aukštos kokybės realistiškus vaizdus. Siekdami to, mes

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24

Климов, М. В. "Використання лазерних діодів в рейтресінговій аберометрії". Thesis, Сумський державний університет, 2015. http://essuir.sumdu.edu.ua/handle/123456789/41002.

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Аберометри є найбільш досконалими офтальмологічними приладами, оскільки вони дозволяють оцінювати сумарну аберацію оптичної системи ока. Однак, їх основним недоліком є висока вартість. Одним із чинників, який визначає вартість аберометра, є використання складної оптико-механічної системи керування лазерним променем, який використовують для рейтресінгу – сканування зіниці ока і сітківки.

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25

Heideman, Kyle C., and John E. Greivenkamp. "Low-coherence interferometer for contact lens surface metrology." SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS, 2016. http://hdl.handle.net/10150/621479.

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Contact lens performance depends on a number of lens properties. Many metrology systems have been developed to measure different aspects of a contact lens, but none test the surface figure in reflection to subwavelength accuracy. Interferometric surface metrology of immersed contact lenses is complicated by the close proximity of the surfaces, low surface reflectivity, and instability of the lens. An interferometer to address these issues was developed and is described here. The accuracy of the system is verified by comparison of glass reference sample measurements against a calibrated commerc

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Krivda, Marian. "Zobrazení kulečníku pomocí distribuovaného sledování paprsku." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2009. http://www.nusl.cz/ntk/nusl-236657.

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This thesis is concerned in the method of realistic rendering using a distributed raytracing. This method simulates various visual effects and generates high realistic 2D images. The work analyses the problem and explains principles of solution related to this technique. There is also descriprion of the method of simple reytracing which provides a basis for the distributed raytracing. A part of work is specialized for optimalization of distributed raytracing.

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Horák, František. "Rychlý výpočet průsečíku paprsku s trojúhelníkem." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2013. http://www.nusl.cz/ntk/nusl-236360.

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This work contains a few basic terms of analytical geometry. We mention some of ray-triangle intersection computation algorithms and present some use-case examples. We discuss capabilities of CUDA, optimization techniques of this architecture and implementation with focus on given issues. Algorithms of ray-triangle intersection are tested and results are discussed.

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Barran, Brian Arthur. "View dependent fluid dynamics." Texas A&M University, 2006. http://hdl.handle.net/1969.1/3827.

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This thesis presents a method for simulating fluids on a view dependent grid structure to exploit level-of-detail with distance to the viewer. Current computer graphics techniques, such as the Stable Fluid and Particle Level Set methods, are modified to support a nonuniform simulation grid. In addition, infinite fluid boundary conditions are introduced that allow fluid to flow freely into or out of the simulation domain to achieve the effect of large, boundary free bodies of fluid. Finally, a physically based rendering method known as photon mapping is used in conjunction with ray tracing to g

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29

Huebscher, Hans-Joachim, Wolfgang Fink, Dagmar Steinbrück, and Theo Seiler. "Scheimpflug Records without Distortion – A Mythos?" Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-133588.

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The Scheimpflug principle was recommended as allowing distortion-free imaging; however, a detailed analysis reveals geometrical errors as well as distortions arising from absorption of light along the optical pathway. Correction formulas and factors will be presented and applied to the biometry of the eye<br>Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich

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Havel, Jiří. "Rychlý výpočet průsečíku paprsku s trojúhelníkem." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2008. http://www.nusl.cz/ntk/nusl-235879.

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Triangle is the mostly used primitive in computer graphics. Calculation of its intersection with a ray has many applications and is often a bottleneck of a program. This work focuses on its usage and various methods of calculation. It tries to combine these techniques to achieve high performance on modern processors.

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Huebscher, Hans-Joachim, Wolfgang Fink, Dagmar Steinbrück, and Theo Seiler. "Scheimpflug Records without Distortion – A Mythos?" Karger, 1999. https://tud.qucosa.de/id/qucosa%3A27518.

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The Scheimpflug principle was recommended as allowing distortion-free imaging; however, a detailed analysis reveals geometrical errors as well as distortions arising from absorption of light along the optical pathway. Correction formulas and factors will be presented and applied to the biometry of the eye.<br>Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.

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Najman, Pavel. "Bezsnímkové renderování." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2012. http://www.nusl.cz/ntk/nusl-236594.

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The aim of this work is to create a simple raytracer with IPP library, which will use the frameless rendering technique. The first part of this work focuses on the raytracing method. The next part analyzes the frameless rendering technique and its adaptive version with focus on adaptive sampling. Third part describes the IPP library and implementation of a simple raytracer using this library. The last part evaluates the speed and rendering quality of the implemented system.

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Wilczák, Martin. "Zobrazování scény v moderních počítačových hrách." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2011. http://www.nusl.cz/ntk/nusl-237038.

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This thesis describes methods for lighting calculations of large scenes used in modern computer games. Forward shading and deferred shading methods are discussed and compared. Capabilities of raytracing are shortly described. There are some information about various methods for casting shadows, simulation of particle systems and applying post-processing effects. In the end there is a design of architecture for rendering complex scenes with use of XNA and description of implementation used in resulting game.

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Foucault, Etienne. "IONO-HF : propagation des ondes hautes fréquences dans l'ionosphère." Thesis, Toulouse 3, 2020. http://www.theses.fr/2020TOU30039.

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L'étude de la propagation des ondes électromagnétiques en bandes hautes (HF) et très hautes fréquences (VHF) dans l'ionosphère gagne en intérêt avec l'essor des technologies de communication et de positionnement par satellites. Cependant, la transmission des signaux associés est dépendante du milieu qu'ils traversent : l'ionosphère. Cette partie de l'atmosphère terrestre (entre 60 et 2,000 km d'altitude) est composée d'un plasma partiellement ionisé, formé par la photo-dissociation des composants neutres par le rayonnement solaire X et UV et impacte la propagation des ondes radios du fait de s

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De, Bort Inès. "Mesure et simulation acoustiques en milieu urbain." Electronic Thesis or Diss., Pau, 2023. http://www.theses.fr/2023PAUU3037.

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Dans cette thèse, nous proposons une méthode d'aide à la conception acoustique applicable à plusieurs échelles, allant de la salle de cours à la ville entière. Pour ce faire, nous avons développé une méthode de lancer de rayons qui permet de suivre les réflexions multiples du son dans des scènes 3D complexes.En acoustique des salles, les deux enjeux les plus courants consistent à déterminer la disposition idéale d'une certaine quantité d'absorbant acoustique et à orienter des panneaux réfléchissants dans les salles trop réverbérantes. Les paramètres acoustiques historiquement utilisés (niveau

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Krupička, Vojtěch. "Bezsnímkové renderování." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2012. http://www.nusl.cz/ntk/nusl-236500.

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This master's thesis deals with the problem of real-time rendering of computer graphics using the method of frameless rendering} as counterpart to the traditional way, which is based on switching between two output buffers. Frameless rendering method is defined and studied in greater depth and its adaptive variant, which delivers better output quality without a~significant reduction of latency, is described in detail. In addition, this thesis describes the implementation of the application which has been developed to demonstrate the principle and functionality of the frameless rendering on the

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Lorenz, Lukas, Krzysztof Nieweglowski, Klaus-Jürgen Wolter, and Karlheinz Bock. "Simulation of bended planar waveguides for optical bus-couplers." SPIE, 2016. https://tud.qucosa.de/id/qucosa%3A34834.

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In our work an optical bus-coupler is proposed, which enables easy bidirectional connection between two waveguides without interrupting the bus using a core-to-core coupling principle. With bended waveguides the coupling ratio can be tuned by adjusting the overlap area of the two cores. In order to ensure large overlap areas at short coupling lengths, the waveguides have rectangular cross sections. To examine the feasibility of this coupling concept a simulation was performed, which is presented in this paper. Due to multimode waveguides, used in short range data communication, a non-sequentia

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Götze, Mirko Brüderlin Beat. "Raytracing mit GPU-Unterstützung /." 2008. http://www.gbv.de/dms/ilmenau/abs/560002475goetz.txt.

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Chou, Po-Hsiang, and 周伯相. "Interactive Hybrid Raytracing using Parallel Computing." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/38359015276276454374.

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碩士<br>國立臺灣大學<br>資訊網路與多媒體研究所<br>98<br>This thesis presents a hybrid ray tracing renderer for fully dynamic scene, camera, and light sources. Many Ray tracing algorithms have been proposed to product most visual effects but these methods are still hard to render at interactive rate on common hardwares. We combined raytracing with local shading methods and used parallel computing on GPUs and CPUs to product most visual effects like soft shadow, reflection, refraction, indirect lighting effects at interactive rate on most common hardware today.

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Stolz, Oliver [Verfasser]. "Differentielles Raytracing für spezielle Beleuchtungssysteme / vorgelegt von Oliver Stolz." 2010. http://d-nb.info/1000822028/34.

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Chang, Chih-Hao, and 張志豪. "Modeling of Millimeter Wave Channel Response Based on a Raytracing Database." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/y6z9kr.

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碩士<br>國立交通大學<br>電子研究所<br>105<br>In our thesis, we develop a millimeter wave channel simulator that can build a sequence of channel response for a track. The simulator makes use of a database which employs 3D-raytracing to compute site-specific radio propagation channels. We get the database from a research team led by Prof. W. H. Sheen at National Chung Cheng University which has used Wireless InSite to compute the channel responses based on a 3D geographic map of Bern, Switzerland, for mmWave wireless communications research. All the transmitters and receivers are static, which me

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Wodniok, Dominik Maximilian. "Higher Performance Traversal and Construction of Tree-Based Raytracing Acceleration Structures." Phd thesis, 2019. https://tuprints.ulb.tu-darmstadt.de/8820/1/Dissertation_Dominik_Wodniok_2019.pdf.

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Ray tracing is an important computational primitive used in different algorithms including collision detection, line-of-sight computations, ray tracing-based sound propagation, and most prominently light transport algorithms. It computes the closest intersections for a given set of rays and geometry. The geometry is usually modeled with a set of geometric primitives such as triangles or quadrangles which define a scene. An efficient ray tracing implementation needs to rely on an acceleration structure to decouple ray tracing complexity from scene complexity as far as possible. The most common

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Smith, Peter M. "On forward and inverse modelling in seismology : raytracing in inhomogeneous media /." 2006. http://collections.mun.ca/u?/theses,65027.

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Torres, Ana Catarina Leitão. "Modelação da acústica submarina e previsão sonar." Master's thesis, 2019. http://hdl.handle.net/10400.26/30289.

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A acústica submarina está na base das operações anti-submarinas realizadas a bordo das unidades navais. A elevada superioridade tática que os submarinos detêm, torna relevante o desenvolvimento de ferramentas operacionais de previsão sonar, que permitam aos navios conhecer a probabilidade e alcance de deteção destas plataformas, para que o sonar seja empregue no sentido de aumentar as hipóteses de deteção, e consequentemente aumentar o desempenho ASW (Anti-Submarine Warfare) das unidades navais. Assim, foi construída uma ferramenta operacional que responda às necessidades da Marinha Portugues

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Spurway, Alan J. "Radiostereometric Analysis Origin Styles: Their Impact on the Accuracy and Precision in the Assessment of Spinal Fusion Success." 2012. http://hdl.handle.net/10222/15058.

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The goal of this thesis was to assess the validity of a computer simulated Radiostereometric Analysis (RSA) environment and assess the use of novel migration origin styles for use in the assessment of spinal fusion success in post-surgical adolescent idiopathic scoliosis patients. A parallel precision study was conducted with a physical phantom and identical computed simulated spinal fusion model. This study was used to conduct a precision validation of the simulate RSA environment. The origin style assessment was done in comparison with the translational and rotational Limits of Clinical Sig

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Marques, Pedro André Alves do Vale. "Acústica submarina." Master's thesis, 2018. http://hdl.handle.net/10400.26/25053.

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A partir da base de dados WOD (World Oceanographic Database) de 2013 da NOAA (National Oceanographic and Atmospheric Administration) e das funções da toolbox GSW (Gibbs- SeaWater) encontrou-se forma, através da ferramenta de linguagem MATLAB, de calcular perfis de temperatura conservativa e salinidade absoluta ao longo da coluna de água. Dos perfis resultantes são calculados os perfis de densidade e velocidade do som. O software desenvolvido utiliza o perfil de velocidades do som para resolver a propagação do som em qualquer posição da base de dados WOD2013 através do método de raytracing. A

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Ollander, Simon. "Accurate Positioning in Urban Canyons with Multi-frequency Satellite Navigation." Doctoral thesis, 2020. http://hdl.handle.net/21.11130/00-1735-0000-0005-1575-0.

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Desjardins, Marc-Antoine. "Construction interactive de BRDFs par simulation 2D de micro-géométries en couches multiples." Thèse, 2012. http://hdl.handle.net/1866/9201.

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Les modèles de réflexion complexes, avec leurs nombreux paramètres dont certains restent non intuitifs, sont difficiles à contrôler pour obtenir une apparence désirée. De plus, même si un artiste peut plus aisément comprendre la forme de la micro-géométrie d'une surface, sa modélisation en 3D et sa simulation en 4D demeurent extrêmement fastidieuses et coûteuses en mémoire. Nous proposons une solution intermédiaire, où l'artiste représente en 2D une coupe dans un matériau, en dessinant une micro-géométrie de surface en multi-couches. Une simulation efficace par lancer de rayons en seulement 2

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Raposo, Pedro de Aragão Matta Amaral. "Estudo da propagação acústica 3D em meios não homogéneos." Master's thesis, 2019. http://hdl.handle.net/10400.26/30301.

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Estudo da propagação acústica 3D em meios não homogéneos. No decorrer deste trabalho foram construídos dois modelos paramétricos de raytracing, um 2D e um 3D, baseados no princípio de Fermat, que estabelece que a trajetória de um raio entre dois pontos é aquela que minimizar o tempo de trajeto. Após estabelecer as equações de Euler-Lagrange associadas ao tempo de trajeto de um raio acústico, foram deduzidos os sistemas de equações diferenciais que modelam as trajetórias de raios acústicos. Em seguida, foram efetuadas as alterações necessárias à resolução dos sistemas deduzidos, permitindo efet

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