Browsing by Author "Brunet Crosa, Pere"
Now showing items 1-20 of 114
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3D model deformations with arbitrary control points
(2016-06-01)
Article
Open AccessCage-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
(Springer International Publishing, 2015)
Part of book or chapter of book
Open AccessThis 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
(1998-06)
Research report
Open AccessIn 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
(1994-10)
Research report
Open AccessThe 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 multi-projector CAVE system with commodity hardware and gesture-based interaction
(2017-01-12)
Research report
Open AccessSpatially-immersive systems such as CAVEs provide users with surrounding worlds by projecting 3D models on multiple screens around the viewer. Compared to alternative immersive systems such as HMDs, CAVE systems are a ... -
A parametric-space-based scan-line algorithm for rendering of bicubic surfaces
(1987)
Article
Open AccessA 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 scalable approach to T2-MRI colon segmentation
(2020-07-01)
Article
Open AccessThe study of the colonic volume is a procedure with strong relevance to gastroenterologists. Depending on the clinical protocols, the volume analysis has to be performed on MRI of the unprepared colon without contrast ... -
A Solution to the problem of collision detection in large environments
(2000-06)
Research report
Open AccessCollision 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
(2021-10-22)
Research report
Open AccessIn 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 differ on how the discrete information ... -
A topological comparison of surface extraction algorithms
(2006-01)
Research report
Open AccessIn 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
(2005)
Conference report
Restricted access - publisher's policyProgressive 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 ... -
Adaptive transfer functions: improved multiresolution visualization of medical models
(Springer, 2016-05-14)
Article
Open AccessMedical datasets are continuously increasing in size. Although larger models may be available for certain research purposes, in the common clinical practice the models are usually of up to 512x512x2000 voxels. These ... -
Affordable immersive projection system for 3d interaction
(SIACG, 2002)
Conference report
Open AccessThis 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
(Universitat Politècnica de Barcelona. Centre de Càlcul, 1978-09)
Article
Open AccessEl 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
(1997-07)
Research report
Open AccessThis 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
(1997-01)
Article
Restricted access - publisher's policyReconstructing 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 ... -
Analysis of methods for generating octree models of objects from their silhouettes
(1996-09-10)
Research report
Open AccessReconstructing 3D models from their projection images has been an interesting research topic in computer vision and geometric modeling. In this paper, we review methods that generate octree models of objects ... -
Approximation of a variable density cloud of points by shrinking a discrete membrane
(North Holland, 2005-12)
Article
Restricted access - publisher's policyThis 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
(2002-12)
Research report
Open AccessThis 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
(1996-01)
Research report
Open AccessThe 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 ...
