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Now showing 1 - 8 of 8
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    Real-time Inextensible Hair with Volume and Shape
    (The Eurographics Association, 2015) Sánchez-Banderas, Rosa María; Barreiro, Héctor; García-Fernández, Ignacio; Pérez, Mariano; Mateu Sbert and Jorge Lopez-Moreno
    Hair simulation is a common topic extensively studied in computer graphics. One of the many challenges in this field is simulating realistic hair in a real-time environment. In this paper, we propose a unified simulation scheme to consider three of the key features in hair simulation; inextensibility, shape preservation and hair-hair interaction. We use an extension to the Dynamic Follow the Leader (DFTL) method to include shape preservation. Our implementation is also coupled with a Lagrangian approach to address the hair-hair interaction dynamics. A GPU-friendly scheme is proposed that is able to exploit the massive parallelism these devices offer, being able to simulate thousands of strands in real-time. The method has been integrated in a game development platform with a shading model for rendering and several test applications have been developed using this implementation.
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    Interactive Earthmoving Simulation in Real-time
    (The Eurographics Association, 2009) Pla-Castells, Marta; García-Fernández, Ignacio; Gamón, Miguel A.; Martínez-Durá, Rafael; Carlos Andujar and Javier Lluch
    Virtual Reality simulators of heavy machinery are often used for training purposes. However, the complexity of terrain as a dynamical system makes the simulation of earthmoving machinery an specially challenging problem. In this paper, the architecture of an excavator simulator is described, together with the different models used to describe the behavior of the systems involved. Special attention is paid to soil dynamics and to the interaction models, including soil-wheel interaction and soil-tool interaction. The different models used are physically-based, in order to guarantee a realistic simulation and an appropriate force feedback.
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    CLIKSA - An Application for Physics Education in Secondary School
    (The Eurographics Association, 2014) Marín-Lora, Carlos; García-Fernández, Ignacio; Adolfo Munoz and Pere-Pau Vazquez
    In this paper we present an application for teaching Physics courses in secondary education. It is a web application, based on HTML5 and on JavaScript. We rely on the graphical capabilities of this technology, including rendering on 2D canvas context and SVG rendering, and we develop a framework for simulating physics behavior. We review other applications with similar features, explaining the motivations of the current development. The system architecture and the software design are discussed and the simulation techniques are explained. We finish with a discussion on some possible examples of use for the application and on the future development plans.
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    Characterisation of Position Based Dynamics for Elastic Materials
    (The Eurographics Association, 2016) Rodero, Cristóbal; Real, Pablo; Zuñeda, Pedro; Monteagudo, Carlos; Lozano, Miguel; García-Fernández, Ignacio; Alejandro Garcia-Alonso and Belen Masia
    Position Based Dynamics (PBD) methodology is a widely used approach for simulation of deformable bodies in the context of video games. Its main advantages over force based methods are its unconditional stability and its constraint based approach. However, it does not involve physically inspired parameters and its behaviour depends on time step size. This makes it difficult to reproduce a given elastic behaviour. In this work we perform an analysis of the mechanical properties in a PBD elastic system, and compare it to the Finite Element Method (FEM). We propose a methodology to fit the parameters of PBD to simulate a particular Young's modulus and Poisson's ratio.
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    CEIG 2018: Frontmatter
    (Eurographics Association, 2018) García-Fernández, Ignacio; Ureña, Carlos; García-Fernández, Ignacio; Ureña, Carlos
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    Simulador de realidad virtual para la formación de operadores de grúa Torre
    (The Eurographics Association, 2009) Gamón-Giménez, Miguel Angel; Pla-Castells, Marta; García-Fernández, Ignacio; Reyes-Lacueva, Alejandro; Martínez-Durá, Rafael Javier; Carlos Andujar and Javier Lluch
    La utilización de simuladores basados en realidad virtual proporciona una solución a los diferentes inconvenientes del entrenamiento de operadores de maquinaria pesada. Entre las ventajas aportadas al ámbito de formación, se encuentran la reducción de riesgos laborales y costes económicos, el incremento en la productividad, y la utilización como herramienta objetiva de evaluación. Este artículo presenta un sistema instruccional basado en simulación para el entrenamiento de operadores de grúa Torre. Este simulador destaca por su enfoque formativo mediante la inclusión de material docente interactivo, el aprendizaje en la maniobrabilidad de una grúa Torre a través de un conjunto de ejercicios y circuitos de entrenamiento, y la utilización de técnicas de realidad virtual del estado del arte (como shaders de iluminación, técnicas de sombreado y avatares cooperativos) que incrementan la experiencia de realismo obtenida. Se describe la arquitectura que compone el simulador, el diseño del entorno virtual basado en OpenSceneGraph, el sistema de autoevaluación, y las características de realismo del modelo dinámico de la grúa, como son la influencia del viento y las colisiones de los cables con otros objetos del entorno virtual. El sistema se complementa con un puesto de instructor que facilita el control, la evaluación, y la monitorización de los puestos de entrenamiento de un aula multipuesto.
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    Population Dynamics Visualization
    (The Eurographics Association, 2012) Lozano, Miguel; García-Fernández, Ignacio; Orduña, Juan Manuel; Isabel Navazo and Gustavo Patow
    In this work we present a graphic, interactive system to validate population dynamics models through hypothesis (simulation results) and radiocarbon samples selection and process. The goal of the graphical tool is to allow the combination of different hypotheses (on the wavefront speed) in a single scenario, so that a more preceise selection of radiocarbon samples reduces global error of the mathematical model.
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    Phase Space Data-Driven Simulation of Elastic Materials
    (The Eurographics Association, 2016) Monteagudo, Carlos; Lozano, Miguel; García-Fernández, Ignacio; Martinez-Gil, Francisco; Alejandro Garcia-Alonso and Belen Masia
    The use of data driven models in computer animation offers several benefits. We present an analysis of a regression model as a method to simulate cloth. In our approach, we generate data from a simple mass-spring system and we fit a regressor. Then, we assemble more complex mass-spring systems and use the learnt model to simulate them. To validate the approach we perform several tests. We analyze the elastic properties of a single learnt spring, measuring its stiffness coefficient, and compare it to the original, physics-based, model. We also build several test scenarios which include the simulation of a piece of cloth under gravity, comparing the regression model and the physics-based model. Finally we test the behaviour of the regression model for systems with high stiffness coefficient and compare its stability properties with a semi-implicit Euler integration method.