CEIG2023

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https://diglib.eg.org/handle/10.2312/2633359

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    Reconstruction of sampled surfaces with boundary via Morse theory
    (The Eurographics Association, 2023) Coltraro, Franco; Amorós, Jaume; Alberich-Carramiñana, Maria; Torras, Carme; Gimeno Sancho, Jesús; Comino Trinidad, Marc
    We study the perception problem for garments (e.g. a pair of pants) using tools from computational topology: the identification of their geometry and position from point-cloud samples, as obtained e.g. with 3D scanners. We present a reconstruction algorithm based on Morse theory that proceeds directly from the point-cloud to obtain a cellular decomposition of the surface derived via a Morse function. No intermediate triangulation or local implicit equations are used, avoiding reconstruction-induced artifices. The results are a piecewise parametrization of the surface as a union of Morse cells, suitable for tasks such as noise-filtering or mesh-independent reparametrization, and a cell complex of small rank determining the surface topology. This algorithm can be applied to smooth surfaces with or without boundary, embedded in an ambient space of any dimension.
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    A Biologically-Inspired Appearance Model for Snake Skin
    (The Eurographics Association, 2023) Padron-Griffe, Juan Raul; Bielsa, Diego; Jarabo, Adrian; Muñoz, Adolfo; Gimeno Sancho, Jesús; Comino Trinidad, Marc
    Simulating the light transport on biological tissues is a longstanding challenge, given its complex multilayered structure. In biology, one of the most remarkable and studied examples of tissues are the scales that cover the skin of reptiles, which present a combination of photonic structures and pigmentation. This is, however, a somewhat ignored problem in computer graphics. In this work, we propose a multilayered appearance model based on the anatomy of the snake skin. Some snakes are known for their striking, highly iridescent scales resulting from light interference. We model snake skin as a two-layered reflectance function: The top layer is a thin layer resulting on a specular iridescent reflection, while the bottom layer is a diffuse highlyabsorbing layer, that results into a dark diffuse appearance that maximizes the iridescent color of the skin. We demonstrate our layered material on a wide range of appearances, and show that our model is able to qualitatively match the appearance of snake skin.
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    CEIG 2023: Frontmatter
    (The Eurographics Association, 2023) Gimeno Sancho, Jesús; Comino Trinidad, Marc; Gimeno Sancho, Jesús; Comino Trinidad, Marc
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    Realidad Virtual Inmersiva para aprender la maniobra de intubación orotraqueal
    (The Eurographics Association, 2023) Muñoz-López, Alicia; Remolar, Inmaculada; Suarez, Juan Daniel; Miralles, Ignacio; Gimeno Sancho, Jesús; Comino Trinidad, Marc
    El proceso de formación en prácticas médicas requiere la disponibilidad de materiales, pacientes y un ambiente adecuado para que los estudiantes se familiaricen con las herramientas y el entorno. Sin embargo, lograr esto resulta a menudo un desafío. La realidad virtual inmersiva surge como una solución prometedora para cerrar la brecha entre el conocimiento teórico y la aplicación práctica dentro de un contexto realista. Este artículo describe el proceso integral de análisis, diseño y desarrollo de un entorno virtual diseñado específicamente para la práctica de la intubación orotraqueal. Este proyecto en curso integra la investigación médica con los avances de vanguardia en la realidad extendida, con el objetivo de mejorar las oportunidades de capacitación disponibles para los estudiantes de medicina.
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    An adaptative Shader for Human Visual Defects Simulation
    (The Eurographics Association, 2023) Fons, Pere; Buades, Jose Maria; Perales, Franisco; Gimeno Sancho, Jesús; Comino Trinidad, Marc
    A novel programmable shader is proposed to accurately simulate the main important human visual defects under different situations in daily life. An improved model of eye model is introduced to reasonably predict the anatomical and optical properties of the human eye. This eye model is composed of an accommodation and color model, and both these models are combined to simulate the varying refractive power of the human eye and color vision deficiency. Finally, distributed ray tracing techniques is combined with this eye model to produce a variety of visual results using the programmable shader in NVIDIA OptiX environment.
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    Implementation and Evaluation of a Low Cost Virtual Environment for Nursery Training in Intensive Care Units
    (The Eurographics Association, 2023) Perales López, Francisco José; García-Pazo, Patricia; Oliver, Antoni; Bibiloni, Antoni; Gimeno Sancho, Jesús; Comino Trinidad, Marc
    The main objective of this work is to implement and evaluate a low cost virtual environment of an Intensive Care Unit (ICU) for educational purposes, targeting third year Nursery students who have never visited an ICU before. To achieve this, an interactive 360-degree environment is created, which is experienced through a Virtual Reality (VR) headset, depicting a simulated clinical case in a simulation room. The environment was tested with university students who had previously visited ICUs, as well as with expert ICU professionals. Through questionnaires, we evaluated the nursing assessment needs, the level of presence, and the satisfaction of the students with the VR experience. The results were compared between professionals and students. The findings indicate that there are no significant differences between the two groups regarding the sense of presence. The environment aids in the assessment of nursing needs for critically ill patients.