Volume 05 (1986)
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Item International Cooperation for Computer Graphics(Blackwell Publishing Ltd and the Eurographics Association, 1986) Sneddon, MarkItem Calendar of Events(Blackwell Publishing Ltd and the Eurographics Association, 1986)Item Offers to EUROGRAPHICS Members(Blackwell Publishing Ltd and the Eurographics Association, 1986)Item Biom orphs: Computer Displays of Biological Forms Generated from Mathematical Feedback Loops(Blackwell Publishing Ltd and the Eurographics Association, 1986) Pickover, C.A.A computer graphics algorithm is used to create complicated forms resembling invertebrate organisms. These natural morphologies are generated through the iteration of mathematical transformations. Several illustrations are chosen as examples of the diversity of biological structures which result from this technique.Item Calendar of Events(Blackwell Publishing Ltd and the Eurographics Association, 1986)Item EUROGRAPHICS -87 - AMSTERDAM CALL FOR PARTICIPATION(Blackwell Publishing Ltd and the Eurographics Association, 1986) ten Hagen, P.J.W.Item Overlap Operations and Raster Graphics(Blackwell Publishing Ltd and the Eurographics Association, 1986) Thomas, A.L.This 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 display systems.Item EUROGRAPHICS General Assembly(Blackwell Publishing Ltd and the Eurographics Association, 1986)Item Two Algorithms for Decomposing a Polyhedron into Convex Parts(Blackwell Publishing Ltd and the Eurographics Association, 1986) Szilvasi-Nagy, M.Two algorithms are presented for splitting a polyhedron into convex components: one for the case of a simple polyhedron and one for a more general case, when the polyhedron may have ring-shaped faces and cavities. The time requirement in both cases is O(DNlogN), where D is the number of concave dihedral angles and N is the number of edges. The algorithm for the simple oasis produces at most D+ 1 convex pieces which is the minimal number of the convex components.Item Calendar of Events(Blackwell Publishing Ltd and the Eurographics Association, 1986)Item EDITORIAL(Blackwell Publishing Ltd and the Eurographics Association, 1986)Item First Time Classroom Computer Graphics(Blackwell Publishing Ltd and the Eurographics Association, 1986) Kelly, Mary B.Item UK Chapter of the EUROGRAPHICS Association CONSTITUTION(Blackwell Publishing Ltd and the Eurographics Association, 1986)Item Proposals for Revisions to the EUROGRAPHICS Constitution and Bye-laws(Blackwell Publishing Ltd and the Eurographics Association, 1986)Item The Priority Tree, a HL/HSR Approach for PHIGS(Blackwell Publishing Ltd and the Eurographics Association, 1986) Abi-Ezzi, S.S.The Programmer-s Hierarchical Interactive Grahics System (PHIGS) specifies an interface for programming device-independent computer graphics applications. PHIGS provides a powerful data grouping mechanism, called the PHIGS structure, that may be used to model the geometry of 3D objects. Hidden Line/Hidden Surface Removal (HL/HSR) is a required process to produce realistic solid views of the modeled objects. Modeling clip is an essential process for viewing a clipped portion of the modeled objects. A technique is presented that provides HL/HSR and modeling clip as added utilities to PHIGS. The technique is based on the Binary Space Partitioning (BSP) tree (sometimes called priority tree), and involves a back to front sorting of the primitives of a PHIGS structure network to another PHIGS structure. Modeling clip is achieved by limiting the sorting to those primitives in a specified clip ping region of the object space. The resulting structure when displayed on a raster device produces a realistic view of the possibly clipped object that was originally modeled by the PHIGS structure network.Item Executive Committee Elections(Blackwell Publishing Ltd and the Eurographics Association, 1986)Item Fast Operations on Raster Images with SIMD Machine Architectures(Blackwell Publishing Ltd and the Eurographics Association, 1986) Arabnia, H. R.; Oliver, M. A.Algorithms for fast operations on a raster image data structure are described. The data structure and algorithms have been designed to exploit SIMD parallel architectures. Images of lines, discs and circles can be created efficiently. Images can be translated, scaled, and combined. The data structure is closely related to runlength encodement. The algorithms have been implemented on an ICL DAP on which the operations can be done in real time (on non-trivial images).Item 5th EUROGRAPHICS UK Conference: University of East Anglia, Norwich: 13-15 April 1987(Blackwell Publishing Ltd and the Eurographics Association, 1986)Item Offers to EUROGRAPHICS Members(Blackwell Publishing Ltd and the Eurographics Association, 1986)Item Call for Contributions(Blackwell Publishing Ltd and the Eurographics Association, 1986)