28 results
Search Results
Now showing 1 - 10 of 28
Item Multi-Dimensional Graphics: Algorithms & Applications(The Eurographics Association, 1986) Inselberg, Alfred; A.A.G. RequichaItem An Introduction to the Graphics Systems Processor(The Eurographics Association, 1986) Short, Graham; A.A.G. RequichaThis paper describes the system applications of the Graphics System Processor (GSP) produced by Texas Instruments Inc. The paper discusses the general-purpose capabilities of the GSP which make it a flexible processor to use. It then goes on to show how the graphics-specific parts of the GSP make it a powerful tool, ideally suited to graphics applications. Finally the paper discusses some of the programmable hardware functions of the GSP which make it easy to design into any graphics system.Item An Implementation of the GKS-3D/Phigs Viewing Pipeline(The Eurographics Association, 1986) Singleton, Karen; A.A.G. RequichaFollowing the establishment of GKS as the first international standard for computer graphics, two new standards, GKS-3D and PHIGS, are emerging which cater for three dimensional graphics. In order to display a 3-D object, a description of how it is to be viewed must be given. GKS-3D and PHIGS provide a viewing pipeline to generate the parallel or perspective view required. This paper describes in detail the functionality and an implementation of the GKS-3D/PHIGS viewing pipeline.Item A Quad-Tree Algorithm for Displaying a 2-Dimensional Slice of an N-Dimensional Weighted Voronoi Tessellation(The Eurographics Association, 1986) Angell, Ian O.; Moore, Richard E.M.; A.A.G. RequichaItem A Statistical Method For Adaptive Stochastic Sampling(The Eurographics Association, 1986) Purgathofer, Werner; A.A.G. RequichaStochastic sampling is a good alternative to pure oversampling in terms of image quality. A method for adaptively controlling the number of required samples to the complexity of the picture is presented. The quality of the obtained picture can be controlled by two well-understandable parameters, these parameters define an error interval sire and the probability that a pixel lies within it. The usefulness of the method is described by applying it to distributed ray-tracing.Item A General Purpose User Interface With Hierarchical Data Structure Management(The Eurographics Association, 1986) Janni, Alberto Di; Italiano, Margherita; A.A.G. RequichaThis paper presents a general purpose User Interface Management System based upon a user driven menu handling and a hierarchical organization of graphic data structure. The package has mainly two purposes: one being to provide facilities to the application programmer in order to ease their tasks and the other one bei to provide a uniform enviroment to the final user. It fulfills two different tasks: it realizes the dialogue with the user and offers a complete set of high level procedures to manage graphic data. lauded attributes, like device independence, feedback at both syntactic and semantic levels, internal automatic recovery, style independent interface toward the application, management and hierarchical definition of structured graphic output, high level graphic functions and a simple definition language. Moreover this system is particularly intended to cover requirements of tools dedicated to integrated circuit design and makes use of a few devices to cut off the computation time and to optimize the memory occupation.Item A Multiple Application Graphics Integrated Circuit - MAGIC(The Eurographics Association, 1986) Agate, M.; Finch, H.R.; Garel, A.A.; Grimsdale, R.L.; Simmonds, A.C.; Lister, P. F.; A.A.G. RequichaMAGIC is a geometry processor which Corms a part of a graphics system based on parallel processing. The number of MAGIC processors required is dictated by the desired system performance. Each unit is capable of controlling the transformation of points and edges from the co-ordinate system of the world model into screen co-ordinates, and performing the associated clipping operations. The proposed VLSI implementation of these transformations is intended to be sufficiently flexible for additional operations such as texture mapping and ray tracing to be supported.Item Towards the Construction of Graphical Interfaces on the Basis of Geometric Models(The Eurographics Association, 1986) Prospero, Manuel Joao; Messina, Luiz Ary; A.A.G. RequichaDialogue control and dialogue object structures are the outlined concepts developed in this paper. Phases of a CAD-Process are presented to show an outstanding application for the concepts The use of logic programming dealing with geometric structures performs the innovative elements to enable the construction of more flexible graphical interfaces, which can operate as information collectors and structure checks in design processes.Item A consistent algorithm to fill triangles and triangular patches(The Eurographics Association, 1986) Overveld, C.W.A.M. van; Lierop, M.L.P van; A.A.G. RequichaIn this paper an algorithm is described for filling triangles in 3D. Since this algorithm uses integer arithmetic only, it is not hampered by inconsistencies that normally arise due to finite machine precision. Moreover, the same algorithm is used for both curved and flat triangular patches.Item A Visualisation Tool for (Landscape) Architects(The Eurographics Association, 1986) Lankhorst, Mrs. J. Roos - Klein; A.A.G. RequichaIn a small and crowded country such as the Netherlands both the government and the individual people are very concerned with what is happening in their environment. Apart from the ecological impacts, the visual effects of new developments are often a very important issue. In this respect a realistic visualisation of future developments can be very useful. Described here is the product of the first stage of a research programme aimed at providing visualistion aids for landcape architects and building designers. Besides showing future developments to the people involved, this tool should enable the building designer to evaluate the aesthetics of a design with respect to the surroundings. Moreover it should enable the landscape architect to "reshape" the landscape by adding, removing and editing artifacts and natural elements on the the graphics screen.