ISSN:0167-7055    

DOI:10.1111/j.1467-8659.1986.tb00262.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

AbstractA multiprocessor algorithm for ray tracing is described. The performance of the algorithm is analysed for a cubic and square array of processors with only local communication between near neighbours. Theoretical expressions for the speedup of the system as a function of the number of processors are derived. These analytic results are supported by simulations of ray tracing on a number of simple scenes with polygonal surfaces. It is found that a square network of processors generally performs better than a cubic network. Some comments are made on the construction of such a system using current (1985) microprocessor technology.

ISSN:0167-7055    

DOI:10.1111/j.1467-8659.1986.tb00263.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

AbstractThis paper outlines the development of a volume and surfaces modelling system for use with raster graphic displays. The ideas are presented in a historical framework to make the reasoning behind the design decisions clear and to indicate the main influences which have guided the work. There are two outcomes of importance: a language form for defining volumes and surfaces; and hardware to convert this representation directly into a display. The hardware provides hidden‐line or hidden‐area removal as a display primitive which, in an appropriate implementation, can be fast enough to support a range of real‐time display applications. Linked to this hidden‐line, hidden‐area removal facility is an ability to provide interference tests for objects that are being moved around in a scene. Again there appears to be a hierarchy of applications ranging in complexity from interactive volume editing to robot control and vision systems. The new facilities complement existing point and line based display operations, on which most current displays' hardware is based. A good case is emerging for integrating the two approaches into a single hardware implementation for CAD workstations and for simulator displa

ISSN:0167-7055    

DOI:10.1111/j.1467-8659.1986.tb00264.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

ISSN:0167-7055    

DOI:10.1111/j.1467-8659.1986.tb00265.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

ISSN:0167-7055    

DOI:10.1111/j.1467-8659.1986.tb00266.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

AbstractThis paper describes the architecture of a system, a prototype of which is being developed by the authors at IBM Rome Scientific Centre, providing an interactive approach to the printing process, starting from the input of the basic components (images, texts and graphics) up to the definition and modification of page layout and finally to driving high resolution output devices. The system manages collections of pages, called “documents”; in turn each page is defined as a spatial composition of elementary boxes distributed on different levels. The main characteristics of the system architecture are interactivity, modularity and non‐procedurality (the user has only to describe “what” has to be done, rather “how

ISSN:0167-7055    

DOI:10.1111/j.1467-8659.1986.tb00267.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

AbstractHigh‐performance computer graphics displays for CAD utilize the Shadow‐Mask CRT (SMCRT). Factors affecting colour‐display quality and ergonomics include beam‐to‐beam convergence, beamspot profile, resolution, brightness, mask pitch, and image linearity. This paper briefly covers the results of recent experiments on eye fatique and vision. In particular, the effects of beam‐to‐beam misconvergence and poor spot performance in colour displays. Extensive discussion is given on beam‐to‐beam misconvergence: What it is, how it is corrected in different SMCRT types, and state‐of‐the‐art techniques for controlling it. Emphasis is given to the digital‐processor based convergence system employing feedback (autoconvergence). Also included are considerations given to selection of CRT types for high‐performance graphics. CRTs are available with dot, slot, or line screens. There are also inline and delta configuration electron guns. Each combination of screen and gun offers tradeoffs in qua

ISSN:0167-7055    

DOI:10.1111/j.1467-8659.1986.tb00268.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

AbstractThrough major innovations in software development Graphicomp succeeded in 1983 in creating ILP program (Intelligent Library Program) as a part of the ICAADS package (Integrated Computer Aided Architectural Design System) which enables maintenance of unlimited intelligent library items, in contrast to huge limited library figure files using large amounts of active diskspace unproductively.Further topics will be discussed:• Library Graphics aspects• Relations between library figures and architectural networks.• ACE menus.• Relations between various ACE applications.• Image design and solid modelling in ACE.• Relations towards 3D town planning and management.• Features of 3D‐

ISSN:0167-7055    

DOI:10.1111/j.1467-8659.1986.tb00269.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

ISSN:0167-7055    

DOI:10.1111/j.1467-8659.1986.tb00270.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

ISSN:0167-7055    

DOI:10.1111/j.1467-8659.1986.tb00271.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY