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Master's Dissertation
DOI
10.11606/D.55.2018.tde-27062018-155528
Document
Author
Full name
Ana Liddy Cenni de Castro Magalhaes
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 1994
Supervisor
Committee
Oliveira, Maria Cristina Ferreira de (President)
Garcia Neto, Alvaro
Wu, Shin - Ting
Title in Portuguese
UM MODELADOR DE SÓLIDOS MULTIRREPRESENTACIONAL: ESTUDO, PROJETO E IMPLEMENTACÃO
Keywords in Portuguese
Não dispensável
Abstract in Portuguese
Esta dissertação apresenta um estudo sobre modelagem de sólidos, e descreve o projeto e a implementação (parcial) do (SM)2 - Sistema de Modelagem de Sólidos Multirrepresentacional, em desenvolvimento pelo grupo de Computação Gráfica e Processamento de Imagens do ICMSC-USP. Em sua versão atual, o (SM)2 admite duas formas de representação de sólidos: por fronteira e implícita. O estudo aqui apresentado abrange as diferentes técnicas de modelagem de sólidos, com ênfase na modelagem por fronteira e nas operações de descrição de sólidos por instanciamento de primitivas e por varredura rotacional e translacional de curvas e faces planares. Como parte deste trabalho, foram implementadas no (SM)2 facilidades para a descrição de objetos por meio de operação de varredura rotacional e translacional, bem como por instanciamento de um conjunto pré-definido de primitivas maciças, ocas e vazadas. Os modelos assim definidos são convertidos para uma estrutura B-Rep (Boundary Representation), utilizada pelo modelador como a principal forma de representação interna para acesso por algoritmos de manipulação, visualização e aplicativos.
Title in English
A multirepresentational solid modeler; study, design and implementation
Keywords in English
Not available
Abstract in English
This work presents a study on solid modeling, and describes the design and partial implementation of (SM)2 - Sistema de Modelagem de Sólidos Multirrepresentacional (Multirepresentational Solid Modeling System), under development within the Computer Graphics and Image Processing Group of the ICMSC-USP. The current version of (SM)2 admits two representations of solids: boundary and implicit. The study comprehends the various solid modeling techniques, emphasizing the boundary modeling approach and modeling operations based on primitive instancing as well as translational and rotational sweeping of plane curves and faces. In this work, facilities for description of objects by primitive instancing (considering a pre-defined set of massive, "empty" and hollow primitives), and also by rotational and translational sweeping were implemented. The models thus described are then converted to a B-Rep (Boundary Representation) data structure, which is kept by the system as the main internal representation for access by external manipulation and visualization algorithms and applications.
 
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Publishing Date
2018-06-27
 
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