Browsing by Author "Marques, Ricardo"

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  • A perceptually-validated metric for crowd trajectory quality evaluation
    Cabrero Daniel, Beatriz; Marques, Ricardo; Hoyet, Ludovic; Pettré, Julien; Blat, Josep (ACM Association for Computer Machinery, 2021)
    Simulating crowds requires controlling a very large number of trajectories and is usually performed using crowd motion algorithms for which appropriate parameter values need to be found. The study of the relation between ...
  • A Spherical Gaussian framework for Bayesian Monte Carlo rendering of glossy surfaces
    Marques, Ricardo; Bouville, Christian; Ribardière, Mickaël; Santos, Luís Paulo; Bouatouch, Kadi (Institute of Electrical and Electronics Engineers (IEEE), 2013)
    The Monte Carlo method has proved to be very powerful to cope with global illumination problems but it remains costly in terms of sampling operations. In various applications, previous work has shown that Bayesian Monte ...
  • Extensible spherical Fibonacci grids
    Marques, Ricardo; Bouville, Christian; Bouatouch, Kadi; Blat, Josep (Institute of Electrical and Electronics Engineers (IEEE), 2021)
    Spherical Fibonacci grids (SFG) yield extremely uniform point set distributions on the sphere. This feature makes SFGs particularly well-suited to a wide range of computer graphics applications, from numerical integration, ...
  • Gradient-based steering for vision-based crowd simulation algorithms
    Dutra, T. B.; Marques, Ricardo; Cavalcante‐Neto, J.B.; Vidal, C. A.; Pettré, J. (Wiley, 2017)
    Most recent crowd simulation algorithms equip agents with a synthetic vision component for steering. They offer promising perspectives through a more realistic simulation of the way humans navigate according to their ...
  • Interactive VPL-based global illumination on the GPU using fuzzy clustering
    Colom, Arnau; Marques, Ricardo; Santos, Luís Paulo (Elsevier, 2022)
    Physically-based synthesis of high quality imagery, including global illumination light transport phenomena, results in a significant workload, which makes interactive rendering a very challenging task. We propose a VPL-based ...
  • Optimal sample weights for hemispherical integral quadratures
    Marques, Ricardo; Bouville, Christian; Bouatouch, Kadi (Wiley, 2018)
    This paper proposes optimal quadrature rules over the hemisphere for the shading integral. We leverage recent work regarding the theory of quadrature rules over the sphere in order to derive a new theoretical framework for ...
  • Optimizing layout using spatial quality metrics and user preferences
    Bahrehmand, Arash; Batard, Thomas; Marques, Ricardo; Evans, Alun Thomas; Blat, Josep (Elsevier, 2017)
    Computational design is one of the most common tasks of immersive computer graphics projects, such as games, virtual reality and special effects. Layout planning is a challenging phase of architectural design, which requires ...
  • Spectral analysis of quadrature rules and fourier truncation-based methods applied to shading integrals
    Marques, Ricardo; Bouville, Christian; Bouatouch, Kadi (Institute of Electrical and Electronics Engineers (IEEE), 2019)
    We propose a theoretical framework, based on the theory of Sobolev spaces, that allows for a comprehensive analysis of quadrature rules for integration over the sphere. We apply this framework to the case of shading ...
  • Spherical Fibonacci point sets for illumination integrals
    Marques, Ricardo; Bouville, Christian; Ribardière, Mickaël; Santos, Luís Paulo (Wiley, 2013)
    Quasi-Monte Carlo (QMC) methods exhibit a faster convergence rate than that of classic Monte Carlo methods. This feature has made QMC prevalent in image synthesis, where it is frequently used for approximating the value ...