CEIG: Spanish Computer Graphics Conferencehttps://diglib.eg.org:443/handle/10.2312/8932024-03-29T13:13:24Z2024-03-29T13:13:24ZReconstruction of sampled surfaces with boundary via Morse theoryColtraro, FrancoAmorós, JaumeAlberich-Carramiñana, MariaTorras, Carmehttps://diglib.eg.org:443/handle/10.2312/ceig202311462023-07-07T08:45:11Z2023-01-01T00:00:00ZReconstruction of sampled surfaces with boundary via Morse theory
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.
2023-01-01T00:00:00ZImplementation and Evaluation of a Low Cost Virtual Environment for Nursery Training in Intensive Care UnitsPerales López, Francisco JoséGarcía-Pazo, PatriciaOliver, AntoniBibiloni, Antonihttps://diglib.eg.org:443/handle/10.2312/ceig202311472023-07-07T08:45:14Z2023-01-01T00:00:00ZImplementation and Evaluation of a Low Cost Virtual Environment for Nursery Training in Intensive Care Units
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.
2023-01-01T00:00:00ZAn adaptative Shader for Human Visual Defects SimulationFons, PereBuades, Jose MariaPerales, Franiscohttps://diglib.eg.org:443/handle/10.2312/ceig202311442023-07-07T08:45:14Z2023-01-01T00:00:00ZAn adaptative Shader for Human Visual Defects Simulation
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.
2023-01-01T00:00:00ZA Biologically-Inspired Appearance Model for Snake SkinPadron-Griffe, Juan RaulBielsa, DiegoJarabo, AdrianMuñoz, Adolfohttps://diglib.eg.org:443/handle/10.2312/ceig202311432023-07-07T08:45:12Z2023-01-01T00:00:00ZA Biologically-Inspired Appearance Model for Snake Skin
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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