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Item Low-cost Experimental Setups for Mid-air 3D Reconstruction(The Eurographics Association, 2015) Dancu, Alexandru; Fratarcangeli, Marco; Fourgeaud, Mickaël; Franjcic, Zlatko; Chindea, Daniel; Fjeld, Morten; Andrea Giachetti and Silvia Biasotti and Marco TariniThe reconstruction of the physical environment using a depth sensor involves data-intensive computations which are difficult to implement on mobile systems (e.g., tracking and aligning the position of the sensor with the depth maps). In this paper, we present two practical experimental setups for scanning and reconstructing real objects employing low-price, off-the-shelf embedded components and open-source libraries. As a test case, we scan and reconstruct a 23 m high statue using an octocopter without employing external hardwareItem CLIKSA - An Application for Physics Education in Secondary School(The Eurographics Association, 2014) Marín-Lora, Carlos; García-Fernández, Ignacio; Adolfo Munoz and Pere-Pau VazquezIn 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.Item An Application to Interact with 3D Models Reconstructed from Medical Images(The Eurographics Association, 2012) Paulano, F.; Pulido, R.; Jiménez, J. J.; Isabel Navazo and Gustavo PatowAlthough the reconstruction of 3D models from medical images is not an easy task, there are many algorithms to perform it. However, the reconstructed models are usually large, have a lot of outliers and have not a correct topology. For that reason, the algorithms used to interact with them must be fast and robust. In this paper, we present an application that enables the interaction with models reconstructed from medical images. The application uses Marching Cubes to generate triangle soups from the medical images. Then, the user can define models by selecting a set of triangles. Once the models have been defined, the application allows to interact with them. In addition, a detailed collision detection is calculated between the models in the scene in order not only to avoid that models in the scene collide, but also to determine which triangles are overlapping. In addition, the calculation of distances and nearest points provides visual aid when the user is interacting with the models.Item A 3DWeb Application for Weather Forecast Based on WebGL(The Eurographics Association, 2015) Graciano, Alejandro; Rueda, Antonio J.; Feito, Francisco R.; Martínez, Francisco; Mateu Sbert and Jorge Lopez-MorenoManagement, interpretation and visualization of geoscientific and atmospherical information is a major problem for the geoscientist and for a correct diffusion, due to its high volume, complexity, spatiotemporal dimension and three-dimensional nature. As a result, development of software tools for integration, exploration and graphical analysis of the growing amount of available geodata is of great importance. In the last decade a trend towards the implementation of these tools as web applications has consolidated because of its benefits: universal access, permanent availability and ease of collaborative use. However until recently Web development technologies have been ill-equipped for implementing interactive 2D and 3D applications dealing with large amounts of data as required by many geoscience applications. The support of WebGL by most modern browsers has changed this situation and promises to revolutionize the Web in the next few years with a new generation of visually appealing, high performance interactive applications. In this work we describe the technologies for 3D Web and their use in the context of atmospherical data using a 3D weather information application as case study.Item Kinamo: Gait Analysis System(The Eurographics Association, 2012) Martínez, H.; Gil-Gómez, J. A.; Martínez-Gramage, J.; Juan, M. C.; Isabel Navazo and Gustavo PatowThe gait analysis is a fundamental technique for functional assessment of patients with gait problems. This analysis is generally available to few patients because the systems needed to carry it out have a high cost. In this paper, we present a novel system, Kinamo, which allows to decrease drastically the cost when performing the gait analysis using Kinect cameras, which not only allows the reduction of cost, but also facilitates the acquisition conditions.Item Industrial Facility Modeling Using Procedural Methods(The Eurographics Association, 2015) Bishop, M. Scott; Max, Nelson; Mateu Sbert and Jorge Lopez-MorenoWe present an end-to-end system for procedurally modeling an industrial facility. The system is a collection of utilities that work together to assemble, lay out, and model a typical industrial facility (e.g. a wastewater treatment plant). A plug-in to the CityEngine (R) procedural modeling application was built in Java (TM) using an open-source framework. The plug-in provides the interface to access the facility assembly and layout engines, the facility rule file and Python script generators, and the OBJ footprint exporter. The system provides functionality for placing the facility model into an existing 3D scene using an established facility location algorithm that maximizes the minimum distance from existing structures in the scene.Item Population Dynamics Visualization(The Eurographics Association, 2012) Lozano, Miguel; García-Fernández, Ignacio; Orduña, Juan Manuel; Isabel Navazo and Gustavo PatowIn 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.Item NetVis: a Visualization Tool Enabling Multiple Perspectives of Network Traffic Data(The Eurographics Association, 2013) Nicholls, James; Peters, Dominik; Slawinski, Albert; Spoor, Thomas; Vicol, Sergiu; Happa, Jassim; Goldsmith, Michael; Creese, Sadie; Silvester Czanner and Wen TangComputer network traffic visualizations deliver improved understanding of pattern-of-life for networks, and such enhanced awareness can facilitate the detection of malicious traffic. Existing tools often opt for graph or plotbased visualizations to detect patterns or outliers in the data, but they still largely provide segmented views. In this paper we present a novel framework designed to support multiple heterogeneous visualizations of network traffic data. NetVis enables different visualizations that work in tandem to provide different perspectives of the same data in real-time. As each visualization is modularly tied together, it enables a user to investigate on-going activity, or any subset of it, at their pace and based on their priorities for further exploration. We currently support six visualizations, three are new and three are based on existing literature (parallel coordinate plots, flowscan and spinning cube of potential doom). Our results show that it is possible to use NetVis to detect unusual activity such as cyber attacks on a network. The framework is written to allow future visualizations to be added straightforwardly.Item Geometry-based Algorithm for Detection of Asymmetric Tunnels in Protein Molecules(The Eurographics Association, 2013) Byska, Jan; Jurcik, Adam; Sochor, Jirí; Silvester Czanner and Wen TangWe present a novel geometry-based method for computing asymmetric tunnels and voids in proteins, approximating their real shape with selected precision. Our method combines ideas from Voronoi and grid based approaches for protein analysis. We represent tunnels in protein using voxel data grid which allows us to store their shape more accurately. Our algorithm employs a tunnel skeleton computed using Voronoi diagram. The skeleton allows us to perform grid computation in a bounded space, with lower time and memory demands, and easily identify and measure individual tunnels.Item Explaining Neighborhood Preservation for Multidimensional Projections(The Eurographics Association, 2015) Martins, Rafael Messias; Minghim, Rosane; Telea, Alexandru C.; Rita Borgo and Cagatay TurkayDimensionality reduction techniques are the tools of choice for exploring high-dimensional datasets by means of low-dimensional projections. However, even state-of-the-art projection methods fail, up to various degrees, in perfectly preserving the structure of the data, expressed in terms of inter-point distances and point neighborhoods. To support better interpretation of a projection, we propose several metrics for quantifying errors related to neighborhood preservation. Next, we propose a number of visualizations that allow users to explore and explain the quality of neighborhood preservation at different scales, captured by the aforementioned error metrics.We demonstrate our exploratory views on three real-world datasets and two state-of-the-art multidimensional projection techniques.