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Author : Wayne E. Hoit
Publisher :
Page : 120 pages
File Size : 22,33 MB
Release : 1991
Category :
ISBN :
Author : Marie-Paule Cani
Publisher : Morgan & Claypool Publishers
Page : 99 pages
File Size : 23,9 MB
Release : 2007
Category : Computers
ISBN : 1598292102
Providing an intuitive modeling system, which would enable us to communicate about any free-form shape we have in mind at least as quickly as with real-world tools, is one of the main challenges of digital shape design. The user should ideally be able to create, deform, and progressively add details to a shape, without being aware of the underlying mathematical representation nor being tied by any constraint on the geometrical or topological nature of the model. This book presents the field of interactive shape design from this perspective. Since interactively creating a shape builds on the humans ability of modeling by gesture, we note that the recent advances in interactive shape design can be classified as those that rely on sculpting as opposed to sketching metaphors. Our synthetic presentation of these strategies enables us to compare the different families of solutions, discuss open issues, and identify directions for future research. Table of Contents: Introduction / Sculpting Metaphors / Sketching Systems / Future Directions: Modeling by Gesture
Author : Megan Gill
Publisher : Createspace Independent Publishing Platform
Page : 38 pages
File Size : 18,83 MB
Release : 2017-02-03
Category :
ISBN : 9781542701730
Traditional geometry, plane and solid--or even analytic-does not tell us how to create even the most simple shapes we see all around us in both the natural world and the made one. The methods of constructive solid geometry (CSG) gives us a way to describe complicated solid shapes as combinations of simpler solid shapes. This makes it an important tool for computer graphics and geometric modeling. CSG uses Boolean operators to construct a procedural model of a complex solid. This model, or rather the data describing the model, is stored in the mathematical form of a binary tree, where the leaf nodes are simple shapes, or primitives, sized and positioned in space, and each branch node is a Boolean operator: union, difference, or intersection.
Author : Ray Goult
Publisher :
Page : 64 pages
File Size : 46,88 MB
Release : 1999
Category : CAD/CAM systems
ISBN :
Ce fascicule est publié par la NAFEMS sans ISBN ni ISSN.
Author :
Publisher : Academic Press
Page : 532 pages
File Size : 33,95 MB
Release : 2014-05-19
Category : Computers
ISBN : 1483297454
The decades of the 1970s and 1980s were a very exciting period of discovery in the field of computer graphics. It was a time when new rendering algorithms, different modeling strategies, clever animation techniques,and significant advances in photorealism were being made. Complementing these software developments, hardware systems were dominated by raster technology and programmers had access to excellent workstations on which to develop their graphics systems. In the 1990s, incredible advances in computer graphics are far surpassing developments made during the last twenty years. Yesterdays computer graphics have given way to todays virtual reality. This volume brings together contributions from internationalexperts on the diverse, yet important, range of topics that impact the design and application of virtual environments. Topics covered include 3-D modeling; new approaches to rendering virtual environments; recent research into the problems of animating and visualizing virtual environments; applications for virtual reality systems; and simulation of complex behaviors. Computer Graphics: Developments in Virtual Environments provides a unique opportunity to examine current practice and expert thinking. It is essential reading for students, practitioners, researchers, or anyone else who wishes to find out more about this exciting area. Provides comprehensive coverage of the latest topics in computer graphics, virtual reality, and human computer interaction Contributors are international experts in the field Examines many real-world applications in a wide variety of fields
Author : Jack Goldfeather
Publisher :
Page : 24 pages
File Size : 39,10 MB
Release : 1988
Category :
ISBN :
Described is a set of algorithms for efficiently rendering a CSG-defined objective directly into a frame buffer without converting first to a boundary representation. The method requires only that the frame buffer contain sufficient memory to hold two color values, two z values, and three one-bit flags. The algorithm first converts the CSG tree to a normalized form that is analogous to the sum-of-products form for boolean switching functions. Expanding on results previously reported the authors, introduce 1) an improved algorithm for converting a CSG expression to sum-of-products form, 2) a technique for minimizing the tree using don't care conditions based on geometry, 3) the dynamic interleaving of the above two algorithms, allowing very efficient rendering for most CSG objects, 4) a method for extending the technique to non-convex primitives, and 5) an implementation of these ideas in an interactive CSG design system on Pixelplanes 4. In this system the designer directly manipulates the CSG structure while continuously viewing the color rendering of the object under design. It is believed these algorithms will attain similar speeds on many of the next generation high-performance graphics system that have frame buffers with many bits per pixel. Author. (KR).
Author : American Society for Engineering Education. Conference
Publisher :
Page : 1064 pages
File Size : 40,36 MB
Release : 1991
Category : Engineering
ISBN :
Author : John R. Davy
Publisher :
Page : 18 pages
File Size : 38,91 MB
Release : 1994
Category : Computational geometry
ISBN :
Abstract: "Solid modelling using constructive solid geometry (CSG) includes many examples of stylised divide-and-conquer algorithms. We identify the sources of these recurrent patterns and implement a Geometric Evaluation Library (GEL) which captures them as higher order functions. This library then become [sic] the basis of developing CSG applications quickly and concisely. GEL is currently implemented as a set of separately compiled modules in the pure functional language Hope+. We evaluate our work in terms of performance and general applicability. We also assess the benefits of the functional paradigm in this domain and the merits of programming with a set of higher order functions."
Author : Wasim Ahmed Khan
Publisher : Springer Science & Business Media
Page : 816 pages
File Size : 37,98 MB
Release : 2011-02-16
Category : Technology & Engineering
ISBN : 0857291866
Virtual Manufacturing presents a novel concept of combining human computer interfaces with virtual reality for discrete and continuous manufacturing systems. The authors address the relevant concepts of manufacturing engineering, virtual reality, and computer science and engineering, before embarking on a description of the methodology for building augmented reality for manufacturing processes and manufacturing systems. Virtual Manufacturing is centered on the description of the development of augmented reality models for a range of processes based on CNC, PLC, SCADA, mechatronics and on embedded systems. Further discussions address the use of augmented reality for developing augmented reality models to control contemporary manufacturing systems and to acquire micro- and macro-level decision parameters for managers to boost profitability of their manufacturing systems. Guiding readers through the building of their own virtual factory software, Virtual Manufacturing comes with access to online files and software that will enable readers to create a virtual factory, operate it and experiment with it. This is a valuable source of information with a useful toolkit for anyone interested in virtual manufacturing, including advanced undergraduate students, postgraduate students and researchers.
Author : Joe Warren
Publisher : Morgan Kaufmann
Page : 326 pages
File Size : 26,87 MB
Release : 2002
Category : Art
ISBN : 9781558604469
Subdivision Methods for Geometric Design provides computer graphics students and designers with a comprehensive guide to subdivision methods, including the background information required to grasp underlying concepts, techniques for manipulating subdivision algorithms to achieve specific effects, and a wide array of digital resources on a dynamic companion Web site. Subdivision Methods promises to be a groundbreaking book, important for both advanced students and working professionals in the field of computer graphics.