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GPU-accelerated Adaptively Sampled Distance Fields

GPU-accelerated Adaptively Sampled Distance Fields

引用

IEEE International Conference on Shape Modeling and Applications

作者： Bastos, Thiago Celes, Waldemar Tecgraf - Computer Graphics Technology Group Department of Computer Science PUC-Rio Brazil

ISBN: (纸本)9781424422609

Adaptively Sampled Distance Fields (ADFs) are volumetric shape representations that support a broad range of applications in the areas of computer graphics, computer vision and physics. ADFs are especially beneficial for representing shapes with features at very diverse scales. In this paper, we propose a strategy to represent and reconstruct ADFs on modem graphics hardware (GPUs). We employ a 3D hashing scheme to store the underlying data structure and try to balance the tradeoff between memory requirements and reconstruction efficiency. To render ADFs on GPU, we use a general-purpose ray-casting technique based on sphere tracing, which guarantees the reconstruction of fine details. We also present a way to overcome the C-1 discontinuities inherent to ADFs and efficiently reconstruct smooth surface normals across cell boundaries. The effectiveness of our proposal is demonstrated for isosurface rendering and morphing.

关键词： ADFs GPU algorithms implicit surface rendering

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A collaborative VR visualization environment for offshore engineering projects

A collaborative VR visualization environment for offshore en...

引用

10th International Conference on Virtual Reality Continuum and Its Applications in Industry, VRCAI'11

作者： DosSantos, Ismael H.F. Soares, Luciano P. Carvalho, Felipe Raposo, Alberto CENPES - Petrobras Research Center Rio de Janeiro Brazil Tecgraf - Computer Graphics Technology Group Pontifical Catholic University Rio de Janeiro Brazil

ISBN: (纸本)9781450310604

The current way of designing industrial plants relies on the communication among experts in the field, and on tools that allow the simulation of the site. Virtual reality (VR) tools are used to visualize and interact with complex 3D environments in real time, and several engineering simulations employ VR to foresee the results of complex industrial operations. The research project described here presents a collaborative engineering environment (CEE) that integrates VR techniques into a system where the execution of different sequences of engineering simulations is modeled as scientific workflows. The focus of this research is on the oil & gas industry, particularly offshore engineering, where the project of a new production unit is a lengthy and expensive process and usually is conducted by different specialists who are geographically distributed. Among the integrated engineering simulations are those involving structural calculus, hydrodynamics, naval engineering with mooring systems, meteo-oceanography, and others. The main objective is to improve the users' interpretation capacity and skills while providing visualization tools for a better understanding of the results. © 2011 ACM.

关键词： Virtual reality

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GPU-accelerated Adaptively Sampled Distance Fields

GPU-accelerated Adaptively Sampled Distance Fields

引用

International Conference on Shape Modeling and Applications

作者： Thiago Bastos Waldemar Celes Department of Computer Science Tecgraf Computer Graphics Technology Group Brazil

Adaptively Sampled Distance Fields (ADFs) are volumetric shape representations that support a broad range of applications in the areas of computer graphics, computer vision and physics. ADFs are especially beneficial for representing shapes with features at very diverse scales. In this paper, we propose a strategy to represent and reconstruct ADFs on modern graphics hardware (GPUs). We employ a 3D hashing scheme to store the underlying data structure and try to balance the tradeoff between memory requirements and reconstruction efficiency. To render ADFs on GPU, we use a general-purpose ray-casting technique based on sphere tracing, which guarantees the reconstruction of fine details. We also present a way to overcome the Cl discontinuities inherent to ADFs and efficiently reconstruct smooth surface normals across cell boundaries. The effectiveness of our proposal is demonstrated for isosurface rendering and morphing.

关键词： Shape computer graphics Application software computer vision Physics Hardware Data structures Rendering (computer graphics) Surface reconstruction Proposals

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A multimedia workflow-based collaborative engineering environment integrating an adaptive workflow system with a multimedia collaboration system and a collaborative virtual environment for petroleum engineering

A multimedia workflow-based collaborative engineering enviro...

引用

ICEIS 2004 - Proceedings of the Sixth International Conference on Enterprise Information Systems

作者： Santos, Ismael H. F. Valle, Carla Raposo, Alberto B. Gattass, Marcello Fraunhofer Gesellschaft FhG Sankt Augustin Germany CENPES Petrobras Research Center Rio de Janeiro Brazil Tecgraf Computer Graphics Technology Group PUC-Rio Rio de Janeiro Brazil

ISBN: (纸本)9728865007

In this paper we discuss the scenario of Petroleum Engineering projects of Petrobras, a large Brazilian governmental oil & gas company. Based on this scenario, we define a set of requirements and system architecture to guide the construction of a Collaborative Engineering Environment for assisting the control and execution of large and complex industrial projects in oil industry, specifically tailored for Petroleum Engineering. The environment is composed by the integration of three different technologies of group work: Workflow Management System, Multimedia Collaborative System and Collaborative Virtual Environments.

关键词： Multimedia systems

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Continuous interaction with TDK: Improving the user experience in terralib

Continuous interaction with TDK: Improving the user experien...

引用

9th Brazilian Symposium on GeoInformatics, GEOINFO 2007

作者： Metello, Marcelo De Sá Vera, Mário Lemos, Melissa Masiero, Leone Pereira De Carvalho, Marcelo Tilio Monteiro Tecgraf - Computer Graphics Technology Group Pontifical Catholic University of Rio de Janeiro Rua Marquês de São Vicente 225 Gávea Rio de Janeiro RJ 22453-900 Brazil

ISBN: (纸本)9788517000362

Historically, visual display has always played a very important role in GIS applications. However, visual exploration tools do not scale well when applied to huge spatial data sets. More recently, faster processing hardware and more sophisticated computer graphics has been used to improve user experience for geospatial data visualization. Some applications have recently introduced the concept that the user should be able to navigate through the data in a smooth and continuous way without being blocked waiting for data to be loaded, even if this means seeing incomplete data for some time. Google Earth and NASA World Wind are recent examples of this concept. This paper describes an architecture incorporated in the TDK (TerraLib Development Kit) open source API to provide support for applications that want this kind of user interaction with Terralib geographical data.

关键词： NASA

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Efficient asynchronous evolution of physical simulations

Efficient asynchronous evolution of physical simulations

引用

Brazilian Symposium on computer graphics and Image Processing (SIBGRAPI)

作者： W. Celes TeCGraf / PUC-Rio-Computer Graphics Technology Group Pontifical Catholic University of Rio de Janeiro Rio de Janeiro Rio de Janeiro Brazil

The paper introduces a new approach to simulate physical systems by asynchronous numerical integration: different bodies are moved with different stepsizes, but the whole system evolves within a single time frame. The approach ensures that interacting bodies are synchronized, but independent bodies are allowed to move independently. Particle system simulations show significant gain in performance when compared to the conventional, synchronous approach.

关键词： Computational modeling Animation computer graphics Performance gain Virtual reality computer simulation Proposals Coherence Discrete event simulation

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Didactic games system: Fifteen years of development in military simulation

Didactic games system: Fifteen years of development in milit...

引用

6th International North-American Conference on Intelligent Games and Simulation 2011, Game-On 'NA 2009 and 3rd International North American Simulation technology Conference, NASTEC 2011

作者： De Oliveira Lyrio, Gustavo Henrique Soares De Beauclair Seixas, Roberto PUC-Rio-Pontifical Catholic University TECGRAF-Computer Graphics Technology Group Rua Marques de Säo Vicente 225 22453-900 Rio de Janeiro RJ Brazil IMPA-National Institute for Pure and Applied Mathematics Estrada Dona Castorina 110 22460-320 Rio de Janeiro RJ Brazil

ISBN: (纸本)9789077381656

This work has the goal of presenting the author's experience through the last fifteen years developing military simulation games for the Brazilian Marine Corps. Starting from the birth of the idea of a didactic training game, we pass through the problems found and the solutions adopted to nowadays, where the system covers all kinds of attributions that a Brazilian Marine officer could receive.

关键词： Circuit simulation

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Using Lua as script language in games coded in Java

Using Lua as script language in games coded in Java

引用

4th International North-American Conference on Intelligent Games and Simulation, Game-On 'NA 2008

作者： De Oliveira Lyrio, Gustavo Henrique Soares De Beauclair Seixas, Roberto Institute of Pure and Applied Mathematics - IMPA Estrada Dona Castorina 110 Rio de Janeiro RJ 22460-320 Brazil Computer Graphics Technology Group - TECGRAF Catholic University of Rio de Janeiro - PUC-Rio Rua Marqus de So Vicente 255 Rio de Janeiro RJ 22453-900 Brazil

ISBN: (纸本)9789077381427

Lua is a programming language that has been well accepted by the game development community as a script language. That is because Lua offers a series of methods to allow the use of C functions inside Lua code and vice-versa. When developers choose to code a game in Java, apparently Lua is not an option anymore. The objective of this work is to show that Lua can also be used as script language for games coded in Java. For that developers just need to know the LuaJava library and a few tips.

关键词： Software design

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Modeling Agents for real environment

Modeling Agents for real environment

引用

3rd International North-American Conference on Intelligent Games and Simulation, Game-On 'NA 2007

ISBN: (纸本)9789077381359

This work presents Modeling Agents for Real Environments, a framework to build predefined behavior agents and insert then into real environments to run in real time. Coded in Lua, MARE departs from a formal definition of agents and join games techniques such as A* algorithm, finite state machines, terrain tiles and others to build a fully customizable tool for games or simulation creation.

关键词： Software design

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Real-time warfare simulation goes web 2.0

Real-time warfare simulation goes web 2.0

引用

5th International North-American Conference on Intelligent Games and Simulation, Game-On 'NA 2009

作者： De Oliveira Lyrio, Gustavo Henrique Soares De Beauclair Seixas, Roberto Institute of Pure and Applied Mathematics - IMPA Estrada Dona Castorina 110 Rio de Janeiro RJ 22460-320 Brazil Computer Graphics Technology Group - TECGRAF Pontifcia Universidade Catlica Do Rio de Janeiro PUC-Rio Rua Marqus de So Vicente 255 Rio de Janeiro RJ 22453-900 Brazil

This work presents the authors' experience in the process of developing a massive real time multi-player for military tactical online training simulations, and how some web 2.0 applications provide helpful tools t... 详细信息

关键词： Serious games

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