Paulo Andrade

Universidade Veiga de Almeida · Escola de Design

O presente trabalho apresenta os resultados de uma pesquisa que objetivou a criação de recursos on-line para apoio ao ensino de uma disciplina presencial de cursos de engenharia, com foco na criação de objetos de aprendizagem que pudessem atender aos diferentes estilos de aprendizagem dos estudantes. A partir da identificação dos estilos de aprendi...

Game engines typically use cube maps or screen space local reflections for simulating reflections effects at the real-time renderer pipeline. While these techniques work in many situations, they cannot deal well with reflections of reflections, reflections from covered spaces, reflections from elements outside the screen space or reflections from e...

This work proposes the use of heuristics to select elements to be rendered, in real time, using ray tracing in a hybrid rendering pipeline. The heuristics purpose is to select, in real time, a subset of the scene elements to be rendered using ray tracing. This selective rendering approach tries to identify the elements that best contribute to the v...

Realistic computer graphics effects as mirror reflections, transparency, caustics and detailed shadows are hard to simulate using real time raster based rendering, since they require global illumination approaches. One option is ray trace these effects using a real-time hybrid renderer, where ray tracing and raster rendering are used together to ge...

Hybrid rendering combines the speed of raster-based rendering with the photorealism of ray trace rendering in order to achieve both speed and visual quality for interactive applications. Since ray tracing images is a demanding task, a hybrid renderer must use ray tracing carefully in order to maintain an acceptable frame rate. Fixed solutions, wher...

A Educação a Distância moderna demanda muito mais do que a apresentação de textos em um monitor de computador. É necessário a produção de conteúdo multimídia cativante, que ofereça uma experiência rica e agradável. Esta produção de conteúdo demanda o envolvimento de profissionais de diversos perfis e especialidades que devem, colaborativamente, atu...

Raster rendering is often associated to real time rendering, while ray tracing is usually considered when quality is more important than speed. Recent works [Hertel and Hormann 2009; Lauterbach 2009; Sabino et al. 2011] offer ray trace effects in raster based real time renderings, in order to improve image quality, where ray tracing strategies seem...

Rendering in 3D games typically uses rasterization approaches in order to guarantee interactive frame rates, since ray tracing, a superior method for rendering photorealistic images, has greater computational cost. With the advent of massively parallel processors in the form of GPUs, parallelized ray tracing have been investigated as an alternative...

Ray-tracing is a computational demanding image generation technique capable of create photo-realistic images. Due to its high demand of computational power, ray-tracing is not used for real-time applications, however, with the massive parallel capabilities of current Graphics Processing Units, and the fact that ray tracing is a suitable application...

This paper presents strategies to control frame rate performance for a Real Time Ray Tracing engine based on OptiX framework by dynamically altering and adjusting visual effects based upon information directly collected from the scene. Performance studies were done to investigate the impact of the number of lights and the use of reflexive or transl...

With the advent of “Pocket Projectors” - projectors based on LED [Rojas 2004], OLED [Miller 2009] or laser light emission [Captain 2008], with sizes similar to smartphones and the emergence of mobile phones capable of video projection, the "projector phones" [Ricker 2008], a new interface and a new way to play games became possible. By means of com...

The Maximum Diversity Problem (MDP) consists in identifying, in a population, a subset of elements, characterized by a set of attributes, that present the most diverse characteristics between themselves. The identification of such solution is an NP-hard problem. This paper presents a GRASP heuristic associated with the path-relinking technique deve...