Ara es mostren els items 57-76 de 104

    • La plataforma Atlas 

      Monclús Lahoya, Eva; Navazo Álvaro, Isabel (1999-01-18)
      Report de recerca
      Accés obert
      This report is the technical manual for programmers developing applications in the platform VolAtlas. The software shared by our group and the design philosophy are presented. This document also includes the user's manual ...
    • LOD visibility culling and occluder synthesis 

      Andújar Gran, Carlos Antonio; Saona Vázquez, Carlos Luis; Navazo Álvaro, Isabel (2000-01)
      Report de recerca
      Accés obert
      Level-of-detail occlusion culling is a novel approach to the management of occluders that can be easily integrated into most current visibility culling algorithms. The main contribution of this paper is an algorithm ...
    • LOD visibility culling and occluder synthesis 

      Andújar Gran, Carlos Antonio; Saona Vázquez, Carlos Luis; Navazo Álvaro, Isabel (Elsevier, 2000-11)
      Article
      Accés obert
      Level-of-detail occlusion culling is a novel approach to the management of occluders that can be easily integrated into most current visibility culling algorithms. The main contribution of this paper is an algorithm that ...
    • Manual d'usuari i del programador de l'aplicacio d'utilitats de l'octree extès 

      Monclús Lahoya, Eva; Navazo Álvaro, Isabel (1997-07-24)
      Report de recerca
      Accés obert
      This report is the user manual of an application that fully shows all the features of the Extended Octree model. It has been developed on the Atlas platform. The main utilities offered by this application are: boolean ...
    • Mechanisms of abdominal distension in severe intestinal dysmotility: abdomino-thoracic response to gut retention 

      Barba, Elisabeth; Quiroga, Santi; Accarino, Anna; Monclús Lahoya, Eva; Malagelada, C; Burri, E; Navazo Álvaro, Isabel; Malagelada, J; Azpiroz, Fernando (2013)
      Article
      Accés restringit per decisió de l'autor
      BACKGROUND: We previously showed that abdominal distension in patients with functional gut disorders is due to a paradoxical diaphragmatic contraction without major increment in intraabdominal volume. Our aim was to ...
    • MTCut: GPU-based marching tetra cuts 

      Monclús Lahoya, Eva; Navazo Álvaro, Isabel; Vázquez Alcocer, Pere Pau (2007-01)
      Report de recerca
      Accés obert
      Isosurface construction and rendering based on tetrahedral grids has shown to be feasible on programmable graphics hardware. In this paper we present MTCut: a volume cutting algorithm that is able to cut isosurfaces obtained ...
    • MTCut: real time marching tetra cuts 

      Monclús Lahoya, Eva; Navazo Álvaro, Isabel; Vázquez Alcocer, Pere Pau (2007)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Isosurface construction and rendering based on tetrahedral grids has been adequately implemented on programmable graphics hardware. In this paper we present MTCut: a volume cutting algorithm that is able to cut isosurfaces ...
    • Multiresolution approximation of polyhedral solids 

      Ayala Vallespí, M. Dolors; Brunet Crosa, Pere; Joan Arinyo, Robert; Navazo Álvaro, Isabel (1996-06)
      Report de recerca
      Accés obert
      Multiresolution models with different levels of detail are a basic tool for handling very large and complex systems in computer aided design applications such as ship design. In this work, we discuss several automatic ...
    • Multiresolution volume visualitzacion with a texture-based octree 

      Boada, Imma; Navazo Álvaro, Isabel; Scopigno, Roberto (Springer, 2001)
      Article
      Accés restringit per política de l'editorial
      Although 3D texture-based volume rendering guarantees image quality almost interactively, it is difficult to maintain an interactive rate when the technique has to be exploited on large datasets. In this paper, we propose ...
    • Navigation in highly polygon-populated ship environments using the visibility octree 

      Saona Vázquez, Carlos Luis; Navazo Álvaro, Isabel; Brunet Crosa, Pere (2000-01)
      Report de recerca
      Accés obert
      This work is focused on the interactive navigation through highly polygon-populated ship environments. A conservative visibility algorithm is presented that hierarchically computes visibility for different observer ...
    • Non-homogeneous solid modeling with octrees. A geological application 

      Puig Puig, Anna; Navazo Álvaro, Isabel; Brunet Crosa, Pere (1993-03)
      Report de recerca
      Accés obert
      From an historical point of view, geometric modeling techniques usually represent the surface of solids. However, the increasing development of new fields in CAD applications like molecular systems, medicine, or geology, ...
    • Object representation by means of nonminimal division quadtrees and octrees 

      Ayala Vallespí, M. Dolors; Brunet Crosa, Pere; Juan, R.; Navazo Álvaro, Isabel (1985-01)
      Article
      Accés restringit per política de l'editorial
      Quadtree representation of two-dimensional objects is performed with a tree that describes the recursive subdivision of the more complex parts of a picture until the desired resolution is reached. At the end, all the leaves ...
    • Octree detection of closed compartments 

      Brunet Crosa, Pere; Navazo Álvaro, Isabel; Vinacua Pla, Álvaro (ACM Press, NY, 1991)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The present paper addresses the problem of detecting closed compartments produced by a set of planar faces in the space. The topology of the set is general, and edges in the final piecewise planar surface can belong to ...
    • Omni-directional relief impostors 

      Andújar Gran, Carlos Antonio; Boo, J; Brunet Crosa, Pere; Fairén González, Marta; Navazo Álvaro, Isabel; Vázquez Alcocer, Pere Pau; Vinacua Pla, Álvaro (North Holland, 2007-07)
      Article
      Accés restringit per política de l'editorial
      Relief impostors have been proposed as a compact and high-quality representation for high-frequency detail in 3D models. In this paper we propose an algorithm to represent a complex object through the combination of ...
    • Optimal exploitation of client texture hardware capabilities on a client-server remote visualization framework 

      Boada, Imma; Navazo Álvaro, Isabel (2003-05)
      Article
      Accés restringit per política de l'editorial
      Given a client-server communication network, with workstations equipped with 3D texture hardware, we propose a technique that guarantees the optimal use of the client texture hardware. We consider the best representation ...
    • Optimal iso-surfaces 

      Andújar Gran, Carlos Antonio; Brunet Crosa, Pere; Chica Calaf, Antonio; Navazo Álvaro, Isabel; Rossignac, Jarek; Vinacua Pla, Álvaro (2004-05)
      Article
      Accés obert
      Since the publication of the original Marching Cubes algorithm, numerous variations have been proposed for guaranteeing water-tight constructions of triangulated approximations of iso-surfaces. Most approaches divide the ...
    • Optimizing the topological and combinatorial complexity of isosurfaces 

      Andújar Gran, Carlos Antonio; Brunet Crosa, Pere; Chica Calaf, Antonio; Navazo Álvaro, Isabel; Rossignac, Jarek; Vinacua Pla, Álvaro (Elsevier, 2005-07)
      Article
      Accés obert
      Since the publication of the original Marching Cubes algorithm, numerous variations have been proposed for guaranteeing water-tight constructions of triangulated approximations of isosurfaces. Most approaches divide the ...
    • Parallel GPU collision computation in conformal warped space for surface detail haptic rendering 

      Theoktisto Colmenares, Víctor Arturo; Fairén González, Marta; Navazo Álvaro, Isabel (Sociedad Venezolana de Métodos Numéricos en Ingeniería, 2016)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      GPU for rendering accurate touch sensation in highly complex geometric models. An object’s geometry is covered completely by a connected mesh of edge-joined prismoids, while surface detail is encoded by an image-based ...
    • Perceptual effects of volumetric shading models in stereoscopic desktop-based environments 

      Díaz Iriberri, José; Ropinski, Timo; Navazo Álvaro, Isabel; Gobbetti, Enrico; Vázquez Alcocer, Pere Pau (2015)
      Comunicació de congrés
      Accés obert
      Throughout the years, many shading techniques have been developed to improve the conveying of information in Volume Visualization. Some of these methods, usually referred to as realistic, are supposed to provide better ...
    • Popping hoops for view-dependent occluder synthesis 

      Saona Vázquez, Carlos Luis; Rossignac, J.; Navazo Álvaro, Isabel; Brunet Crosa, Pere (2000-11)
      Report de recerca
      Accés obert
      Most visibility culling algorithms require convexity of occluders. And those algorithms that do not are much more efficient when convexity is met. Occluder synthesis algorithms lessen this limitation by extracting ...