Simulation modeling and visualization can substantially help in designing complex construction operations and in making optimal decisions where traditional methods prove ineffective or are unfeasible. However, there has been limited use of simulation in planning construction operations due to the unavailability of appropriate visual communication tools that can provide users with a more realistic and comprehensible feedback from simulation analyses. Visualizing simulated construction operations in 3D can significantly help in establishing the credibility of simulation models. In addition, 3D visualization can provide valuable insight into the subtleties of construction operations that are otherwise non-quantifiable and presentable. New software development technologies emerge at incredible rates that allow engineers and scientists to create novel, domain-specific applications. This study capitalized on a computer graphics technology based on the concept of the "Scene Graph" to design and implement a general-purpose 3D Visualization System that is Simulation and CAD-software independent. This system, the "Dynamic Construction Visualizer", enables realistic visualization of modeled construction operations and the resulting products in 3D and can be used in conjunction with a wide variety of simulation tools. This thesis describes the "Dynamic Construction Visualizer" as well as the "Scene Graph" architecture and the Frame Updating algorithms used in its design. / Master of Science

No description available.

<p>The purpose behind this thesis is to develop a software (SceneServer) that can generate data such as images and vertex lists from computer models. These models are placed in a virtual environment and they can be controlled either from a graphical user interface (GUI) or from a MATLAB client. Data can be retrieved and processed in MATLAB. By creating a connection between MATLAB and a 3D environment, computer vision algorithms can be designed and tested swiftly, thus giving the developer a powerful platform. SceneServer allows the user to manipulate, in detail, the models and scenes to be rendered. </p><p>MATLAB communicates with the SceneServer application through a Java library, which is connected to an interface in SceneServer. The graphics are visualised using Open Scene Graph (OSG) that in turn uses OpenGL. OSG is an open source cross-platform scene graph library for visualisation of real-time graphics. OpenGL is a software interface for creating advanced computer graphics in 2D and 3D.</p>

The purpose behind this thesis is to develop a software (SceneServer) that can generate data such as images and vertex lists from computer models. These models are placed in a virtual environment and they can be controlled either from a graphical user interface (GUI) or from a MATLAB client. Data can be retrieved and processed in MATLAB. By creating a connection between MATLAB and a 3D environment, computer vision algorithms can be designed and tested swiftly, thus giving the developer a powerful platform. SceneServer allows the user to manipulate, in detail, the models and scenes to be rendered. MATLAB communicates with the SceneServer application through a Java library, which is connected to an interface in SceneServer. The graphics are visualised using Open Scene Graph (OSG) that in turn uses OpenGL. OSG is an open source cross-platform scene graph library for visualisation of real-time graphics. OpenGL is a software interface for creating advanced computer graphics in 2D and 3D.

A atividade de teste de software tem recebido considerável atenção de pesquisadores e engenheiros de software que reconhecem a sua utilidade na criação de produtos de qualidade. No entanto, os testes são caros e propensos a erros, o que impõe a necessidade de sistematizar e, portanto, a definição de técnicas para aumentar a qualidade e produtividade na sua condução. Várias técnicas de teste têm sido desenvolvidas e têm sido utilizadas, cada um com características próprias em termos de eficácia, custo, fases de aplicação, etc. Sistemas de realidade virtual frequentemente utilizam uma estrutura hierárquica denominada grafo de cena para representar as características dos objetos em um ambiente virtual tridimensional. Os grafos de cena também armazenam informações sobre o relacionamento entre os objetos, permitindo respostas adequadas ao usuário quando ocorrem interações. Neste trabalho, critérios de teste baseados em grafo de cena são estudados e definidos afim de aumentar a qualidade de aplicações de realidade virtual. Além disso, estudos de caso são apresentados, utilizando os critérios definidos aplicados a um framework de realidade virtual construído para gerar aplicações na área médica, além de utilizar uma aplicação de demonstração. Como forma de apoio aos critérios definidos foi desenvolvida uma ferramenta de teste capaz de verificar se os nós, que representam os objetos virtuais na cena, satisfazem seus requisitos conforme foram especificados / The activity of software testing has received considerable attention from researchers and software engineers who recognize its usefulness in creating quality products. However, the tests are expensive and prone to errors, which imposes the need to systematize and hence the definition of techniques to increase quality and productivity in their driving. Several testing techniques have been developed and have been used, each with its own characteristics in terms of effectiveness, cost, implementation stages, etc. Moreover, these techniques can also be adapted. In this work, test criteria based on scene graph are studied and defined in order to increase the quality of the Virtual Reality software. In addition, case studies are presented, using the criteria applied to a framework built to generate virtual reality applications in medicine, in addition to using a demo application. As a form of support to the criteria a testing tool was developed. It verifies whether the nodes that represent the virtual objects meet their requirements as they were specified

A atividade de teste de software tem recebido considerável atenção de pesquisadores e engenheiros de software que reconhecem a sua utilidade na criação de produtos de qualidade. No entanto, os testes são caros e propensos a erros, o que impõe a necessidade de sistematizar e, portanto, a definição de técnicas para aumentar a qualidade e produtividade na sua condução. Várias técnicas de teste têm sido desenvolvidas e têm sido utilizadas, cada um com características próprias em termos de eficácia, custo, fases de aplicação, etc. Sistemas de realidade virtual frequentemente utilizam uma estrutura hierárquica denominada grafo de cena para representar as características dos objetos em um ambiente virtual tridimensional. Os grafos de cena também armazenam informações sobre o relacionamento entre os objetos, permitindo respostas adequadas ao usuário quando ocorrem interações. Neste trabalho, critérios de teste baseados em grafo de cena são estudados e definidos afim de aumentar a qualidade de aplicações de realidade virtual. Além disso, estudos de caso são apresentados, utilizando os critérios definidos aplicados a um framework de realidade virtual construído para gerar aplicações na área médica, além de utilizar uma aplicação de demonstração. Como forma de apoio aos critérios definidos foi desenvolvida uma ferramenta de teste capaz de verificar se os nós, que representam os objetos virtuais na cena, satisfazem seus requisitos conforme foram especificados / The activity of software testing has received considerable attention from researchers and software engineers who recognize its usefulness in creating quality products. However, the tests are expensive and prone to errors, which imposes the need to systematize and hence the definition of techniques to increase quality and productivity in their driving. Several testing techniques have been developed and have been used, each with its own characteristics in terms of effectiveness, cost, implementation stages, etc. Moreover, these techniques can also be adapted. In this work, test criteria based on scene graph are studied and defined in order to increase the quality of the Virtual Reality software. In addition, case studies are presented, using the criteria applied to a framework built to generate virtual reality applications in medicine, in addition to using a demo application. As a form of support to the criteria a testing tool was developed. It verifies whether the nodes that represent the virtual objects meet their requirements as they were specified