Issue 3
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Item Algorithm for Clipping Arbitrary Polygons(Blackwell Publishing Ltd and the Eurographics Association, 1989) Andreev, Rumen D.Item Call for Participation in the EUROGRAPHICS WORKING GROUP on INTELLIGENT CAD(Blackwell Publishing Ltd and the Eurographics Association, 1989)Item Hidden Octree Node Removal as a Pipeline Process(Blackwell Publishing Ltd and the Eurographics Association, 1989) Heal, B.W.A processing pipeline solution to the generation and display of octree encoded 3-D objects is described. Particular emphasis is given to an algorithm which removes that part a of linear octree code which describes parts of the object which are invisible from a prescribed viewing position. The scope of the algorithm is restricted to viewing directions which are parallel to the Cartesian axes and to orthogonal projections. The algorithm is specifically designed to operate as a single stage within a pipeline of processes.Item EUROGRAPHICS UK Chapter Conference CGM Demonstration(Blackwell Publishing Ltd and the Eurographics Association, 1989) Duce, D.A.Item Yet another Remark on the Modelling Clip Problem(Blackwell Publishing Ltd and the Eurographics Association, 1989) Zachrisen, MortenItem An Annotated PHIGS Bibliography(Blackwell Publishing Ltd and the Eurographics Association, 1989) Howard, T.L.J.Item Call for Participation in the EUROGRAPHICS WORKING GROUP on COMPUTER GRAPHICS HARDWARE(Blackwell Publishing Ltd and the Eurographics Association, 1989)Item EUROGRAPHICS ASSOCIATION UK CHAPTER(Blackwell Publishing Ltd and the Eurographics Association, 1989)Item Offers to EUROGRAPHICS Members(Blackwell Publishing Ltd and the Eurographics Association, 1989)Item Call for Participation in the EUROGRAPHICS WORKING GROUP on VISUALIZATION IN SCIENTIFIC COMPUTING(Blackwell Publishing Ltd and the Eurographics Association, 1989)Item Polygon Triangulation Algorithm as a Powerful Core Processor of PLAN-I(Blackwell Publishing Ltd and the Eurographics Association, 1989) Chen, Xiangping; Ying, DaoningA concise, complete and reliable algorithm for triangulating an arbitrary polygon is presented as a powerful core processor of PLAN-I (Production Layout Automation Nucleus) system1. A polygon with inner loops is converted into a non-self-intersecting polygon (NIP) through adding Bridge Edges . A triangular splitting algorithm for NIP is described in detail and successfully implemented. The program is about 300 lines in FORTRAN-77. Sweeping and local operations with respect to the triangular-faceted boundary representation are designed with the algorithm to improve functions of solid modeling in PLAN-I. The algorithm of triangulation can also be applied to Boolean operations and other issues.Item LEONARDO - New Member Benefit for Members of Eurographics(Blackwell Publishing Ltd and the Eurographics Association, 1989)Item Computer Graphics and Computer-Aided Design Literature: A Keyword-Indexed Bibliography for the Year 1988.(Blackwell Publishing Ltd and the Eurographics Association, 1989) Owen, JonItem COMPUTER GRAPHICS PROFESSIONALS(Blackwell Publishing Ltd and the Eurographics Association, 1989)Item Eurographics Workshop on Object Oriented Graphics(Blackwell Publishing Ltd and the Eurographics Association, 1989)Item Report on the Third Eurographics Workshop on Intelligent CAD(Blackwell Publishing Ltd and the Eurographics Association, 1989) Kwiers, R.S.S. PietersItem Notes on the Mathematics of the PHIGS Viewing Pipeline(Blackwell Publishing Ltd and the Eurographics Association, 1989) Krammer, GergelyIt is well known that homogeneous linear matrix transformations of the projective space may be efficiently used for the representation and the execution of common geometrical transformations but the general class of such transformations include also matrices which may cause numerical problems by transforming certain finite geometrical objects to infinity Different methods have been developed for handling such cases and this paper presents a new one called UW clipping which is based on some interesting properties of projective transformations. Furthermore the paper introduces die concept of conic sectors as a generalisation to half-planes and halfspaces respectively, with the invariance property that such sectors are mapped onto other such sectors by projective transformations, and thus enable the transformation of clipping halfplanes and halfspaces. Finally the possibility of transforming die rectangular clipping box into the object space is investigated.Item Calendar of Events(Blackwell Publishing Ltd and the Eurographics Association, 1989)Item A Parallel HW/SW Environment for Image Synthesis(Blackwell Publishing Ltd and the Eurographics Association, 1989) Paoluzzi, A.; Rosina, M.; Scopigno, R.AbstractIn designing graphical workstations for high-level performance presentations of graphical models, the main goal nowadays is to perform some effective real-time traversal and rendering of data. In this paper we present a reference model of parallel processing for graphics, taking into account the main aspects of colour rendering of solid hierarchical shapes- i.e., traversal of structures, hidden surfaces removal, shadow identification and light models. In particular, a parallel design of the main graphical algorithms is presented. Three abstract machines are proposed, designed respectively for data structure traversing, for depth ordering and shadows computation and finally for shape merging and screen processing. Such abstract machines, internally parallel, may be combined in various ways to define different physical architectures.CR Categories and Subject Descriptors: C.1.2 [Multiple Data Stream Architectures] MIMD Processors, Parallel Processors- 1.3.2 [Computer Graphics] Graphics Systems- 1.3.3 [Computer Graphics] Picture Generation -Display Algorithms, Viewing Algorithms- 1.3.7 [Computer Graphics] Three Dimensional Graphics and Realism - Colour, Shading, Shadowing, Visible Line/Surface I Algorithms.Item EDITORIAL(Blackwell Publishing Ltd and the Eurographics Association, 1989) Arnold, David; de Ruiter, Behr