Ara es mostren els items 1-20 de 84

  • 3D model deformations with arbitrary control points 

    Cerveró Abelló, Maria Àngels; Vinacua Pla, Álvaro; Brunet Crosa, Pere (2016-06-01)
    Article
    Accés restringit per política de l'editorial
    Cage-based space deformations are often used to edit and animate images and geometric models. The deformations of the cage are easily transferred to the model by recomputing fixed convex combinations of the vertices of the ...
  • A critical analysis of human-subject experiments in virtual reality and 3D user interfaces 

    Andújar Gran, Carlos Antonio; Brunet Crosa, Pere (Springer International Publishing, 2015)
    Capítol de llibre
    Accés restringit per política de l'editorial
    This paper is about the major peculiarities and difficulties we encounter when trying to validate research results in fields such as virtual reality (VR) and 3D user interfaces (3DUI). We review the steps in the empirical ...
  • A Geometric relaxation solver for parametric constraint-based models 

    Solano Albajés, Lluís; Brunet Crosa, Pere (1998-06)
    Report de recerca
    Accés obert
    In this paper, a new relaxation algorithm for solving geometric constraint-based models is proposed. The algorithm starts from a constructive symbolic representation of objects (Constructive ...
  • A Language for constructive parametric solid modelling 

    Solano Albajés, Lluís; Brunet Crosa, Pere (1994-10)
    Report de recerca
    Accés obert
    The report discusses proposed solutions for constraint-based modelling, with special emphasis on constructive approaches. A new constructive scheme that overcomes a number of the present limitations is proposed. It is based ...
  • A parametric-space-based scan-line algorithm for rendering of bicubic surfaces 

    Pueyo Sánchez, Xavier; Brunet Crosa, Pere (1987)
    Article
    Accés obert
    A novel scan-line algorithm for displaying bicubic surfaces is presented. Patches are decomposed on regions of constant sign of the z component of the normal before the scan process. Most of the computations are done in ...
  • A Solution to the problem of collision detection in large environments 

    Franquesa Niubó, Marta; Brunet Crosa, Pere (2000-06)
    Report de recerca
    Accés obert
    Collision detection between several objects in a closed space is an interesting research topic in all those areas where objects must not penetrate one another, such as Computer Graphics, Computer Vision, Virtual ...
  • A topological comparison of surface extraction algorithms 

    Andújar Gran, Carlos Antonio; Brunet Crosa, Pere; Fairén González, Marta; Navazo Álvaro, Isabel; Vinacua Pla, Álvaro (2006-01)
    Report de recerca
    Accés obert
    In many application areas, it is useful to convert the discrete information stored in the nodes of a regular grid into a continuous boundary model. Isosurface extraction algorithms di er on how the discrete information in ...
  • A Virtual Reality approach to progressive lenses simulation 

    Rodríguez Celaya, José Antonio; Brunet Crosa, Pere; Ezquerra, Norberto; Palomar, J.E. (2005)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    Progressive lenses are lenses that allow focusing objects at any distance. The main problem of these lenses is the arise of marginal zones that present aberrations in which vision is defective. The interest of our research ...
  • Affordable immersive projection system for 3d interaction 

    Andújar Gran, Carlos Antonio; Fairén González, Marta; Brunet Crosa, Pere (SIACG, 2002)
    Text en actes de congrés
    Accés obert
    This paper describes an affordable Virtual Reality system designed and developed by a group of researchers at the Polytechnic University of Catalunya (UPC). The system allows direct selection and manipulation of virtual ...
  • Algunas posibilidades y limitaciones de las técnicas de filtraje no lineal 

    Brunet Crosa, Pere; Pagès Fita, Jaume (Universitat Politècnica de Barcelona. Centre de Càlcul, 1978-09)
    Article
    Accés obert
    El filtraje no lineal es una técnica con grandes posibilidades; previsiblemente podrá utilizarse para problemas tales como el de previsión, estudio de series cronológicas y estimación de parámetros. Cabe distinguir entre ...
  • Alice 2.0: un visualizador interactivo de escenas 3D 

    Santisteve, Francisco Jose; Andújar Gran, Carlos Antonio; Brunet Crosa, Pere (1997-07)
    Report de recerca
    Accés obert
    This work describes the main features of a 3D visualizer called ALICE. This navigator has been developed over the Motif and OpenGL libraries by the Graphics Section of the L.S.I. departament in UPC. ALICE provides ...
  • Analysis of methods for generating octree models of objects from their silhouettes 

    Franquesa Niubó, Marta; Brunet Crosa, Pere (1997-01)
    Article
    Accés restringit per política de l'editorial
    Reconstructing 3D models from their projection images has been an interesting research topic in computer vision and geometric modeling. In this paper, we review several methods that generate octree models of objects from ...
  • Approximation of a variable density cloud of points by shrinking a discrete membrane 

    Esteve Cusiné, Jordi; Brunet Crosa, Pere; Vinacua Pla, Álvaro (North Holland, 2005-12)
    Article
    Accés restringit per política de l'editorial
    This paper describes a method to obtain a closed surface that approximates a general 3D data point set with nonuniform density. Aside from the positions of the initial data points, no other information is used. Particularly, ...
  • Approximation of a variable density cloud of points by shrinking a discrete membrane 

    Esteve Cusiné, Jordi; Brunet Crosa, Pere; Vinacua Pla, Álvaro (2002-12)
    Report de recerca
    Accés obert
    This paper describes a method to obtain a closed surface that approximates a general 3D data point set with non-uniform density. Excluding the initial data points, any other previous information is not used (as, for ...
  • Automatic generation of multiresolution boundary representations 

    Andújar Gran, Carlos Antonio; Ayala Vallespí, M. Dolors; Brunet Crosa, Pere; Joan Arinyo, Robert; Solé Bosquet, Jaume (1996-01)
    Report de recerca
    Accés obert
    The paper focuses on automatic simplification algorithms for the generation of a multiresolution family of solid models from an initial boundary representation of a polyhedral solid. An algorithm for general polyhedra ...
  • Biharmonic fields and mesh completion 

    Argudo Medrano, Óscar; Brunet Crosa, Pere; Chica Calaf, Antonio; Vinacua Pla, Álvaro (2015-11)
    Article
    Accés restringit per política de l'editorial
    We discuss bi-harmonic fields which approximate signed distance fields. We conclude that the bi-harmonic field approximation can be a powerful tool for mesh completion in general and complex cases. We present an adaptive, ...
  • Collision detection: models and algorithms 

    Franquesa Niubó, Marta; Brunet Crosa, Pere (1998-02)
    Report de recerca
    Accés obert
    Collision detection between several objects in a closed space is an interesting research topic in all those areas where objects must not penetrate one another, such as Computer Graphics, Computer Vision, Virtual ...
  • Collision prediction using MKtrees 

    Franquesa Niubó, Marta; Brunet Crosa, Pere (2004)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    K dimensional tree data structure(Multiresolution Kdtree, MKtree) is introduced. In a complex scene containing a high number of individual objects, the MKtree represents a hierarchical subdivision of the scene objects that ...
  • Collision prediction using MKtrees: broad phase and refinement levels of the narrow phase 

    Franquesa Niubó, Marta; Brunet Crosa, Pere (2003-10)
    Report de recerca
    Accés obert
    In this paper, the collision prediction between polyhedra under screw motions and a static scene using a new $ dimensional tree data structure ({emph Multiresolution Kdtree, MKtree}) is introduced. In a complex ...
  • Collision queries: models and algorithms 

    Franquesa Niubó, Marta; Brunet Crosa, Pere (2003-10)
    Report de recerca
    Accés obert
    In this paper, a review of models and algorithms that are conceived to solve the collision queries problem is presented. Here, the type of query in proximity and collision computations is stated. The phases to solve the ...