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  • A cost-effective approach for developing application-control GUIs for virtual environments 

    Andújar Gran, Carlos Antonio; Fairén González, Marta; Argelaguet Sanz, Fernando (2006-03)
    Comunicació de congrés
    Accés obert
    In this paper we present a new approach for fast development of application-control User Interfaces (UIs) for Virtual Environments (VEs). Our approach allows developers to build sophisticated UIs containing both simple ...

  • 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 obert
    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 ...

  • 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 ...

  • 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 ...

  • A multi-projector CAVE system with commodity hardware and gesture-based interaction 

    Andújar Gran, Carlos Antonio; Brunet Crosa, Pere; Vinacua Pla, Álvaro; Vico Moya, Miguel Ángel; Díaz García, Jesús (2017-01-12)
    Report de recerca
    Accés obert
    Spatially-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 ...

  • Anisomorphic ray-casting manipulation for interacting with 2D GUIs 

    Andújar Gran, Carlos Antonio; Argelaguet Sanz, Fernando (2007-01)
    Article
    Accés obert
    The accommodation of conventional 2D GUIs with virtual environments (VEs) can greatly enhance the possibilities of many VE applications. In this paper we present a variation of the well-known ray-casting technique for fast ...

  • A survey of real-time crowd rendering 

    Beacco Porres, Alejandro; Pelechano Gómez, Núria; Andújar Gran, Carlos Antonio (2016-12)
    Article
    Accés obert
    In this survey we review, classify and compare existing approaches for real-time crowd rendering. We first overview character animation techniques, as they are highly tied to crowd rendering performance, and then we analyze ...

  • 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 ...

  • 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 ...

  • Automatic speed graph generation for predefined camera paths 

    Argelaguet Sanz, Fernando; Andújar Gran, Carlos Antonio (Springer Verlag, 2009)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    Predefined camera paths are a valuable tool for the exploration of complex virtual environments. The speed at which the virtual camera travels along different path segments is key for allowing users to perceive and ...

  • Coherent multi-layer landscape synthesis 

    Argudo Medrano, Óscar; Andújar Gran, Carlos Antonio; Chica Calaf, Antonio; Guerin, Eric (Springer, 2017-05-08)
    Article
    Accés obert
    We present an efficient method for generating coherent multi-layer landscapes. We use a dictionary built from exemplars to synthesize high-resolution fully featured terrains from input low-resolution elevation data. Our ...

  • Complexity and occlusion management for the World-in-Miniature Metaphor 

    Trueba Hornero, Ramón; Andújar Gran, Carlos Antonio; Argelaguet Sanz, Fernando (Springer Verlag, 2009)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    he World in Miniature (WIM) metaphor allows users to interact and travel efficiently in virtual environments. In addition to the first-person perspective offered by typical VR applications, the WIM offers a second dynamic ...

  • Computing maximal tiles and application to impostor-based simplification 

    Andújar Gran, Carlos Antonio; Brunet Crosa, Pere; Chica Calaf, Antonio; Navazo Álvaro, Isabel; Rossignac, Jarek; Vinacua Pla, Álvaro (North Holland, 2004-08)
    Article
    Accés restringit per política de l'editorial
    The computation of the largest planar region approximating a 3D object is an important problem with wide applications in modeling and rendering. Given a voxelization of the 3D object, we propose an efficient algorithm to ...

  • Dynamic worlds in miniature 

    Trueba Hornero, Ramón; Andújar Gran, Carlos Antonio (., 2008)
    Text en actes de congrés
    Accés obert
    The World in Miniature (WIM) metaphor allows users to interact and travel efficiently in virtual environments. In addition to the first-person perspective offered by typical VR applications, the WIM offers a second dynamic ...

  • Efficient rendering of animated characters through optimized per-joint impostors 

    Beacco Porres, Alejandro; Andújar Gran, Carlos Antonio; Pelechano Gómez, Núria; Spanlang, Bernhard (2012-02)
    Article
    Accés restringit per política de l'editorial
    In this paper, we present a new impostor-based representation for 3D animated characters supporting real-time rendering of thousands of agents. We maximize rendering performance by using a collection of pre-computed ...

  • Error-aware construction and rendering of multi-scan panoramas from massive point clouds 

    Comino Trinidad, Marc; Andújar Gran, Carlos Antonio; Chica Calaf, Antonio; Brunet Crosa, Pere (2016-09-30)
    Article
    Accés obert
    Obtaining 3D realistic models of urban scenes from accurate range data is nowadays an important research topic, with applications in a variety of fields ranging from Cultural Heritage and digital 3D archiving to monitoring ...

  • Exploiting the potential of image based crowd rendering 

    Izquierdo, Maria; Beacco Porres, Alejandro; Pelechano Gómez, Núria; Andújar Gran, Carlos Antonio (European Association for Computer Graphics (Eurographics), 2015)
    Comunicació de congrés
    Accés restringit per política de l'editorial
    Per-joint impostors have been used to achieve high performance when rendering thousands of agents, while still allowing us to blend animation. This provides interactively animated crowds and reduces the memory footprint ...

  • Friction surfaces: scaled ray-casting manipulation for interacting with 2D GUIs 

    Andújar Gran, Carlos Antonio; Argelaguet Sanz, Fernando (2006-05-17)
    Text en actes de congrés
    Accés obert
    The accommodation of conventional 2D GUIs with Virtual Environments (VEs) can greatly enhance the possibilities of many VE applications. In this paper we present a variation of the well-known ray-casting technique for fast ...

  • Geometry simplification 

    Andújar Gran, Carlos Antonio (1999-02)
    Report de recerca
    Accés obert
    In this work we present the principles and applications of geometry simplification, focusing on simplification of polygonal representations of solids and surfaces. Related concepts such as multiresolution, level-of-detail ...

  • GL-Socket: A CG plugin-based framework for teaching and assessment 

    Andújar Gran, Carlos Antonio; Chica Calaf, Antonio; Fairén González, Marta; Vinacua Pla, Álvaro (European Association for Computer Graphics (Eurographics), 2018)
    Text en actes de congrés
    Accés obert
    In this paper we describe a plugin-based C++ framework for teaching OpenGL and GLSL in introductory Computer Graphics courses. The main strength of the framework architecture is that student assignments are mostly independent ...