Aitor Moreno

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Verified

Aitor verified their affiliation via an institutional email.

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• PhD in Computer Science
• Project Manager at Vicomtech

Virtual Reality training for fire fighters and managers has two main advantages. On one hand, it supports the simulation of complex scenarios like big cities, where a fire cannot be simulated in the real world. On the other hand, fire fighting VR simulators allow trainees to experience situations as similar as possible to real fire, reducing the pr...

In the context of computer numeric control (CNC)-based sheet metal laser cutting, the problem of heat transfer simulation is relevant for the optimization of CNC programs. Current physically based simulation tools use numeric or analytic algorithms which provide accurate but slow solutions due to the underlying mathematical description of the model...

In sheet metal machining process, it is of extreme importance to be able to detect cut parts, differentiating the blank and processed elements. When the parts are cut from the rest of the sheet, such elements are prone to move freely and may jump or cause damage to the machine, or even affect workers’ safety. In this scenario, the simulation of she...

This article presents and discusses the implementation of a direct volume rendering system for the Web, which articulates a large portion of the rendering task in the client machine. By placing the rendering emphasis in the local client, our system takes advantage of its power, while at the same time eliminates processing from unreliable bottleneck...

We present a real-time volume rendering component for the Web, which provides a set of illustrative and non-photorealistic styles. Volume data is used in many scientific disciplines, requiring the visualization of the inner data, features for enhancing extracted characteristics or even coloring the volume. The Medical Working Group of X3D published...

A gerotor pump is a two‐piece mechanism where two rotational components, interior and exterior, engage each other via a rotational motion to transfer a fluid in a direction parallel to their rotational axes. A natural question arises on what shape of the gerotor is the optimal one in the sense of maximum fluid being pumped for a unit of time, given...

A gerotor pump is a two-piece mechanism where two rotational components, interior and exterior, engage each other via a rotational motion to transfer a fluid in a direction parallel to their rotational axes. A natural question arises on what shape of the gerotor is the optimal one in the sense of maximum fluid being pumped for a unit of time, given...

Gerotors are a family of mechanical pumps used for cooling, lubrication and fuel transfer in aerospace, medicine, etc. Modern industry demands to shorten the development time of products. This means further integration between the different design stages. As in any hydraulic machinery, an important bottleneck in the design process is the simulation...

The decomposition of solids is a problem of interest in areas of engineering such as feature recognition or manufacturing planning. The problem can be stated as finding a set of smaller and simpler pieces that glued together amount to the initial solid. This decomposition can be guided by geometrical or topological criteria and be applied to either...

In the current wave of digital industry, Digital Twins play a major role in the virtualization of manufacturing processes. Digital Twins are virtual entities that mirror the behavior of physical entitites. They are used to predict or monitor the information of a product or a process. In recent years, virtualization technologies have benefited from...

In laser metal deposition of overhanging geometries, non-planar layers are used to partially avoid the highly inconvenient support structures. Multi-axis machines provide extra degrees of freedom that allow the deposition of non-planar layers. However, path planning for non-planar slicing is complex because, in most geometries, it encourages non-ho...

In the context of Industrie 4.0, it is necessary for several applications, to encode characteristics of a Boundary Representation of a manifold M in an economical manner. Two related characterizations of closed B-Reps (and the solid they represent) are (1) medial axis and (2) Reeb Graph. The medial axis of a solid region is a non-manifold mixture o...

In the context of Laser Metal Deposition (LMD), temporary support structures are needed to manufacture overhanging features. In order to limit the need for supports, multi-axis machines intervene in the deposition by sequentially repositioning the part. Under multi-axis rotations and translations, slicing and toolpath generation represent significa...

In the context of laser metal deposition (LMD), the problem of avoiding unintentional material accumulation in bead corners or bends is central. Most of the existing approaches to limit such an accumulation are expensive trial-and-error ones. This manuscript presents the experimental verification of a recently reported computational method for mini...

The generation of the printing paths is a decisive step in additive manufacturing (AM). There is a variety of patterns that offer different characteristics, but those that are strictly continuous become especially relevant in certain types of AM by extrusion, with materials like bioinks, carbon or clays, since they do not allow the retraction of th...

Simulation of Laser Metal Deposition (LMD) is central to the planning of Additive Manufacturing processes. This manuscript presents the computational implementation of a 2D-plus-thickness nonlinear thermal simulation of LMD, which considers: (i) temperature-dependent material properties, (ii) heat losses due to convection and radiation, (iii) geome...

In the context of smart manufacturing, the concept of Visual Computing is a key enabling technology for Industry 4.0. Visual Computing and Physically-based simulation enables the implementation of interactive, visual and (in most cases) non-disruptive solutions within the context of (a) the production process (off-line or in-line) the shop floor, (...

Industry 4.0 paradigm has introduced a set of technological advances into the productive means. However, the training of the operators is somehow neglected. An operator without the necessary skills will take risks or will provoke problems that might appear at any point of the productive process. Therefore, training the operators is required to acqu...

In the context of laser-based additive manufacturing, the thermal behavior of the substrate is relevant to define process parameters vis-à-vis piece quality. The existing literature focuses on two process variables: (a) lumped laser power and (b) process speed. However, this literature does not consider other variables, such as those related to the...

The generation of the printing paths is a decisive step in additive manufacturing (AM). There is a variety of patterns that offer different characteristics, but those that are strictly continuous become especially relevant in certain types of AM by extrusion, with materials like bioinks, carbon or clays, since they do not allow the retraction of th...

Avoidance of over-deposition at trajectory corners is relevant in Laser Metal Deposition (LMD) for Additive Manufacturing. Currently available LMD hardware only allows constant material feed (g/s). Therefore, gliding speed of the material dispenser is the remaining tuning variable for controlling metal over-deposition at corners. Existing literatur...

Additive manufacturing is a key technology of Industry 4.0. In the context of Laser Metal Deposition (LMD), the problem of automating the generation of the layer-by-layer deposition strategies is relevant because the laser path pattern and the process parameters determine the mechanical quality of the resulting part and the efficiency of the proces...

In the context of generation of lubrication flows, gear pumps are widely used, with gerotor-type pumps being specially popular, given their low cost, high compactness, and reliability. The design process of gerotor pumps requires the simulation of the fluid dynamics phenomena that characterize the fluid displacement by the pump. Designers and resea...

This short abstract is based in a Conference Keynote about use cases of Computer Graphics and Visual Computing for Industry 4.0 and Operator 4.0. An extended version of this article was published by invitation of the Conference Organizers in the International Journal for Simulation and Multidisciplinary Design Optimization.

THis short abstract was presented in the Internacional Conference IconACES 2020, and was selected for submitting an extended version that was accepted in the International Journal for Simulation and Multidisciplinary Design Optimization

In the context of CAD CAM CAE (Computer-Aided Design, Manufacturing and Engineering) and Additive Manufacturing, the computation of level sets of closed 2-manifold triangular meshes (mesh slicing) is relevant for the generation of 3D printing patterns. Current slicing methods rely on the assumption that the function used to compute the level sets s...

In the context of numerical methods, the problem of frequency-domain (spectral) simulations is crucial for the solution of Partial Differential Equations. Fast Fourier Transform (FFT) algorithms significantly reduce the computational cost of such simulations and enable parallelization using Graphics Processing Units (GPUs). In the particular subdom...

Lattice-based workpieces contain patterned repetition of individuals of a basic topology (Schwarz, ortho-walls, gyroid, etc.) with each individual having distinct geometric grading. In the context of the design, analysis and manufacturing of lattice workpieces, the problem of rapidly assessing the mechanical behavior of large domains is relevant fo...

In flexible manufacturing systems, fast feedback from simulation solutions is required for effective tool path planning and parameter optimization. In the particular sub-domain of laser heating/cutting of thin rectangular plates, current state-of-the-art methods include frequency-domain (spectral) analytic solutions that greatly reduce the required...

In the context of lattice manufacturing, the problem of mechanical and structural characterization of large lattice domains is relevant. Lattice materials are used in engineering (e.g. in energy absorption and heat conduction) and biomedical (e.g. bone implants and artificial tissues) applications. However, the numerical simulation of large lattice...

In the context of lattice-based design and manufacturing, the problem of physical realization of density maps into lattices of a particular family is central. Density maps are prescribed by design optimization algorithms, which seek to fulfill structural demands on a workpiece, while saving material. These density maps cannot be directly manufactur...

Due to a lack of ubiquitous tools for volume data visualization, 3D rendering of volumetric content is shared and distributed as 2D media (video and static images). This work shows how using open web technologies (HTML5, JavaScript, WebGL and SVG), high quality volume rendering is achievable in an interactive manner with any WebGL-enabled device. I...

Shape optimization in the context of technical design is the process by which mechanical demands (e.g. loads, stresses) govern a sequence of piece instances, which satisfy the demands, while at the same time evolving towards more attractive geometric features (e.g. lighter, cheaper, etc.). The SIMP (Solid Isotropic Material with Penalization) strat...

In the context of Computer Simulation, the problem of heat transfer analysis of thin plate laser heating is relevant for downstream simulations of machining processes. Alternatives to address the problem include (i) numerical methods, which require unaffordable time and storage computing resources even for very small domains, (ii) analytical method...

The Industry 4.0 paradigm introduced several technologies in the industrial manufacturing landscape, highlighting the Cyber Physical Systems, Internet of Things and Visual Computing as some of the key enabling technologies. The fast paced evolution of the technology has to be reflected in the common ground between the machines and the operators. Th...

Interactive multi-beam laser machining simulation is crucial in the context of tool path planning and optimization of laser machining parameters. Current simulation approaches for heat transfer analysis (1) rely on numerical Finite Element methods (or any of its variants), non-suitable for interactive applications; and (2) require the multiple lase...

Mesh segmentation and parameterization are crucial for Reverse Engineering (RE). Bijective parameterizations of the sub-meshes are a sine-qua-non test for segmentation. Current segmentation methods use either (1) topologic or (2) geometric criteria to partition the mesh. Reported topology-based segmentations produce large sub-meshes which reject pa...

3D image rendering for virtual reality HMDs is typically generated based on a set of parameters taken from the manufacturer-supplied specifications and an idealised perspective model. But actual displays may vary in build features that alter spatial perception. Moreover, the eye focusing effort is often ignored. The resulting visual discomfort and...

FEA simulation of thermal metal cutting is central to interactive design and manufacturing. It is therefore relevant to assess the applicability of FEA open software to simulate 2D heat transfer in metal sheet laser cuts. Application of open source code (e.g. FreeFem++, FEniCS, MOOSE) makes possible additional scenarios (e.g. parallel, CUDA, etc.),...

In the last year, the concept of Industry 4.0 and smart factories has increasingly gained more importance. One of the central aspects of this innovation is the coupling of physical systems with a corresponding virtual representation, known as the Digital Twin. This technology enables new powerful applications, such as real-time production optimizat...

Recent developments in Web-based volume rendering have gained recognition by Web users and professionals in several fields. The ISO-IEC Standard Extensible 3D (X3D) version 3.3 specifies the integration and visual styling of volumetric data for real-time interaction. The specification is an important milestone describing a framework for expressive...

This paper presents the process to construct a digital twin for a sheet metal punching machine to support the interactive design of optimal NC machining programs. The results show that this entity manages to simulate interactively the basic behaviour of the actual sheet metal machine: movements, machining operations and connectivity with robotic ar...

Recently the possibility to visualize interactively volumetric datasets in the Web has opened new methods of exploration and sharing of 3D images coming from different fields. At the same time, VR technologies are gaining momentum in the society, where several HMD’s are ready to be bought. This paper presents how volumetric datasets represented as...

This paper presents challenges encountered when interacting with 3D environments by means of Virtual Reality devices in a seated position. A use case has been devised and developed to support this work: a fire warden virtual training system. The users interact with the virtual environment with a combination of a Head-Mounted Display and other assis...

This paper presents three required functionality when volume datasets are aimed to be visualized in ubiquitous platforms: (i) support of segmented volume datasets, (ii) navigation inside the volume and (iii) direct visualization of DICOM datasets. DICOM is the de-facto standard in the medical imaging field. The results shows that these functionalit...

Volume rendering is a visualization technique focused in volumetric datasets, which requires a great amount of computational power and memory resources. This situation is even more severe when HTML5 and WebGL implementations are used in ubiquitous platforms to render the virtual scene. This paper presents a WebGL based volume rendering algorithm to...

This paper presents an interactive application addressed to training experts on occupational hazard prevention and more precisely in fire safety in buildings. The platform allows the simulation of fires throughout a building. The fire warden trainee has to deal with that fire by a) finding the safest evacuation route or b) putting the fire out. The...

Finite Element Methods (FEM) have been used to simulate a variety of physical phenomena in the industrial manufacturing sector. This paper addresses the simulation of the thermal properties in the metal sheet laser cutting. A comparison of very well known FEM software is presented. The results present small differences between the temperature distr...

This paper presents the process to virtualise a NC sheet metal punching machine. The results show that the Digital Twin manages to simulate the basic behaviour of the actual sheet metal machine: movements, machining operations and connectivity with robotic arms. The paper concludes with the necessity of going deeper in the virtualisation of the she...

La simulación del mecanizado es una fase del proceso productivo que permite mejorar de forma sustancial el rendimiento, al facilitar la detección de cualquier anomalía no prevista en la fase de diseño. Reduce la cantidad de pruebas del programa en la máquina real y de esta forma, permite ahorrar en tiempo de máquina, materiales, energía, reduciendo...

The ability to guide relief vehicles to safety and quickly pass through environments affected by fires is critical in fighting forest fires. In this paper, we focus on route determination in the case of forest fires, and propose a data model that supports finding paths among moving obstacles. This data model captures both static information, such a...

The cutting and punching industrial processes can be conceptualized as material removal methods, where the sheet is being transformed as the running CNC program is being executed by the NC machine. The simulation of such processes has to take into account this increasing complexity of the metal sheet. In this work we introduce a representation base...

Bird migration behaviours and patterns offer invaluable information about environmental evolution of regions. Traditional bird ringing techniques are often used for nature monitoring. A web based geographical visualization and analysis tool is presented in this paper, showing how cartographic data of wetland areas, their vegetation and water facili...

This work presents a geovisual tool which integrates and georeferences data coming from some of the weather instruments installed in the Basque Country: a Doppler weather radar and the weather station network composed of around 100 multi-sensors stations (temperature, precipitation, wind...). The visualization of the raw data coming from the weathe...

Currently, 3D rendering is accessible within Web browsers through open standards such as WebGL, X3D, and X3DOM. At the same time, there is wealth of mature desktop software which comprises algorithms, data structures, user interfaces, databases, etc. It is a challenge to reuse such desktop software using the Web visualization resources. In response...

La formación de los bomberos es un proceso que incluye contenidos prácticos sobre cómo actuar ante incendios forestales y urbanos. La utilización de simuladores físicos tiene limitaciones impuestas por las condiciones de seguridad requeridas. Realizar prácticas controladas en condiciones reales está también altamente limitado por razones de factibi...

City models visualisation, buildings, structures and volumetric information, is an important task in Computer Graphics and Urban Planning. The different formats and data sources involved in the visualisation make the development of applications a big challenge. We present a homogeneous web visualisation framework using X3DOM and MEDX3DOM for the vi...

Virtual reality (VR) simulators have become a great tool for training purposes, especially for risky and uncertain situations such as today’s widely extended driving or flying simulators. One of these cases is the fire-fighting simulators. The usage of a VR simulator to support the training process of fire fighters and managers has two main advanta...

E-commerce is well established on today’s Internet and has created its own set of techniques for performing and optimizing sales. Traditional shops on the other hand provide a physical space in which decoration and space are relevant. In this paper we present innovative interfaces that join the concepts of real shops and on-line e-commerce in a Web...

In this paper we present a sheet metal Numerical Control (NC) simulation tool for cutting and punching processes, considering the internal representation of the sheet metal as a 2D complex polygon. The nature of the involved processes in the cutting and punching operations supports the utilisation of Boolean Operations between 2D polygons with full...

Once a forest fire is detected, decision makers have to evaluate the situation in order to mobilize all the required resources in the most efficient way. This work presents how a GIS-based simulation tool provides valuable information to the decision makers, so they can trigger rapid and efficient instructions to the individual brigades and fire fi...

Visualization of vector fields plays an important role in research activities nowadays. Web applications allow a fast, multi-platform and multi-device access to data, which results in the need of optimized applications to be implemented in both high and low-performance devices. The computation of trajectories usually repeats calculations due to the...

Fires and other related disasters provoke great destruction of high valuable environments and economical losses, especially when they are located in urban areas. In this work, we present a combined urban and forest fire spreading algorithm to be used in real time and interactive virtual simulations. The algorithm is pedagogical oriented and its pur...

Fires disasters provoke great destruction of high valuable environments and eco-nomical losses, especially when they are located in urban areas. The usage of Virtual Reality Simulator to support the training process of fire fighters and managers has two main advantages: i) it supports the simulation of scenarios like big city fires that could not b...

This work presents an interactive and stereoscopic 3D viewer of weather information coming from a Doppler radar. The hybrid system shows a GIS model of the regional zone where the radar is located and the corresponding reconstructed 3D volume weather data. To enhance the immersiveness of the navigation, stereoscopic visualization has been added to...

Surface reconstruction from unorganized point set is a common problem in computer graphics. Generation of the signed distance field from the point set is a common methodology for the surface reconstruction. The reconstruction of implicit surfaces is made with the algorithm of marching cubes, but the distance field of a point set can not be processe...

This work proposes an extension of the Marching Cubes algorithm, where the goal is to represent implicit functions with higher accuracy using the same grid size. The proposed algorithm displaces the vertices of the cubes iteratively until the stop condition is achieved. After each iteration, the difference between the implicit and the explicit repr...

This work proposes a variation on the Marching Cubes algorithm, where the goal is to represent implicit functions with higher resolution and better graphical qualiry using the same grid size. The proposed algorithm displaces the vertices of the cubes iteratively until the stop condition is achieved. After each iteration, the difference betvveen the...

The Basque Meteorology Agency is conducting an initiative to improve the collection, management and analysis of weather information from a large array of sensing devices. This chapter presents works carried out in this context proposing the application of 3D geographical visualization and image processing for the monitoring of meteorological phenom...

In this paper a natural human computer interaction paradigm is proposed for persons with cognitive impairments such as Alzheimer’s Disease. The paradigm consists of using a realistic virtual character, rendered on a common television set, to play the role of a virtual personal assistant that shows reminders, notifications and performs short dialogu...

This paper presents an edition tool to support the creation of scenarios and exercises for a simulator whose main objective is the training of people in the use and knowledge of construction machinery (currently four wheeled excavator, dumper, lift and platform). The presented scene editor has terrain definition capabilities, such as terrain deform...

Applications for digital tabletops have some notabl e differences when compared to traditional desktop applications, the principal difference being that t he user input method is not the traditional combina tion of mouse and keyboard. This work addresses the difficulties and characteri stics of event-handling management, when the applications are e...

We present the work on a simulator of construction machinery developed to train workers in their safe use. The simulation setup consists of a real versatile cabin placed on a motion platform in order to provide a realistic interaction with the system and a stereoscopic augmented reality system for visualization. We present some insights into the mi...

This work presents a versatile real-time simulator for training workers in the operation of construction machinery. With the aim of reducing the accident rate in the construction sector, a realistic AR scene improves the user experience. Our work addresses two stages of the training process. First, the instructor designs the working environment and...

The computational simulation of the production of spunbond nonwoven fabrics is a new and emerging field of research. Visualising the outcome of these simulations, large sets of thin randomly oriented fibres, has not yet been scientifically covered. We apply a set of visualisation techniques for the analysis of the simulation data using established...

RESUMEN: En este trabajo se presenta un enfoque distinto en el desarrollo de un kernel de simulación para CNC cuya representación interna está basada en niveles. La característica básica de la representación basada en niveles es que permite la realización de operaciones booleanas entre modelos 3D de una forma rápida, pudiendo así ser utilizada en s...