Antônio L. Apolinário

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The past two decades showed a rapid growing of physically-based modeling of fluids for computer graphics applications. In this area, a common top down approach is to model the fluid dynamics by Navier-Stokes equations and apply a numerical techniques such as Finite Differences or Finite Elements for the simulation. In this paper we focus on fluid modeling(More)
—In this paper we present an extension to the Kinect-Fusion algorithm that allows a robust real-time face tracking. This is achieved altering the original algorithm such that when the tracking algorithm fails, it uses a head pose estimation to give an initial guess to the Iterative Closest Point (ICP) algorithm. We show that this approach can handle more(More)
Fig. 1. A schematic view of the markerless augmented reality approach: A) RGB-D live stream. B) A face detector is used to locate the face in the whole image (this step is required only if the face is chosen as the real object that will be augmented). C) Reference 3D model is reconstructed with KinectFusion algorithm [1]. D) The 3D reconstruction is stopped(More)
Nowadays, due to the great distance between design and implementation worlds, different skills are necessary to create a game system. To solve this problem, a lot of strategies for game development, trying to increase the abstraction level necessary for the game production, were proposed. In this way, a lot of game engines, game frameworks and others, in(More)
Feature modeling is a key technique for capturing and explicit documenting the software product line variability. Object Oriented (00) concepts have been frequently used to encapsulate and reuse software resources in large scale systems. To improve the possibilities of combination and derivation between distinct feature models, this paper defines the Object(More)
—In general, augmented reality (AR) applications use polygonal models to augment a real scene. However, most of the medical applications have volumetric data to be visualized. Therefore, it is desirable to the medical AR systems to provide the visualization of these volumes into the real scene in real-time. In this paper we introduce a real-time(More)
This paper uses the Object Oriented Feature Modeling (OOFM) technique to develop Multiple Product Lines (MPLs) and Dynamic SPLs (DSPLs). The idea is combine defined OOFM resources in a Model-View-Controller (MVC) architectural style. As result, a pattern-based Product Line Architecture (PLA) is provided, a kind of middleware that performs an advanced usage(More)
The past two decades showed a rapid growing of physically-based modeling of fluids for computer graphics applications. Techniques in the field of Computational Fluid Dynamics (CFD) have been applied for realistic fluid animation for virtual surgery simulators, computer games and visual effects. In this paper we focus on gas-liquid modeling for computer(More)
Fig. 1. Some results of the proposed methods: Focus+context visualization based on smooth contours (left) and visible background with Computed Tomography (CT) (middle) and Magnetic Resonance Imaging (MRI) data (right). Each one of these methods takes advantage from the volume clipping to improve the visual perception of the augmented reality scene.(More)
Digital games can be considered as an important software development area in our society. This paper proposes the Object Oriented Feature Mod-eling (OOFM) usage in the digital game domain. It aims to represent and manipulate distinct game features, defined by NESI and GDS models, in a parame-terized and hierarchical way. As a result, a Feature-based(More)