Showing papers in "Computers & Graphics in 1988"

TL;DR: This paper comment on the eleven papers published between 1973 to 1984 on the generation of a solid 3-D object from given 2-D orthographic views in a comprehensive table form.

TL;DR: An all-integer decision mechanism which makes the inner-most loop of the algorithm more efficient is discussed too, and all the algorithms guarantee lack of 6-connected “tunnels” in the converted polygons.

TL;DR: A method is obtained for the piecewise analytical description of the hypersurface defined by a trivariate function and of the isosurface of such a function.

TL;DR: This essay deals with the problems of computer-aided construction and development of developable surfaces by connecting two given curves p and q, and presents and discusses different algorithms.

TL;DR: If the vectors could be extracted reliably from the raster image, then rotation, scaling, plotting, and many other operations could be speeded up enormously.

TL;DR: In this paper new methods of discretization (integer approximation) of algebraic spatial curves in the form of intersecting surfaces P(x, y, z) = 0 and Q(x-y-z) =0 are analyzed and adjusted for application in computer graphics and numerical control of machine tools.

TL;DR: An algorithm for generating curves of the fourth type with the aid of computers is presented, which turns out to exist only if the given line elements are symmetric in a certain sense.

TL;DR: A simple graphics technique is described for enhancing features in drawings of 3-D chaotic attractors and numerical recipes are included to encourage reader involvement.

TL;DR: Some interesting results are presented in the paper which have led to a 25–30% improvement in speed when compared to a more conservative implementation of GKS-3D/PHIGS.

TL;DR: This paper describes a centralised graphical database for KRT 3, an experimental hierarchical graphics system based on PHIGS, and presents a discussion of the issues involved, and the experience gained, in the practical design and implementation of a database for hierarchical graphical data.

TL;DR: A new rendering technique of two-way ray tracing is proposed that allows more accurate simulation of light propagation in the environment and greatly reducing the computations involved.

TL;DR: The concepts of drawing bidirectionality and choice of behavior in cases of Equal Error, applied to known algorithms, accelerate drawing speed.

TL;DR: The main result is that the middle stages of the pipeline have similar requirements, and are best mapped to identical general purpose floating point processors.

TL;DR: The application of object-oriented knowledge bases as the basis for computer graphics systems is described and how solid objects, graphical features, and geometric constraints can be represented in logic is discussed.

TL;DR: An overview of some concepts that have been recently developed for the exchange of solid models for solid model exchange and the influence of the CAD∗I project on the development of the international standard STEP are outlined.

TL;DR: The GSS represents a solid log as a nonregular polyhedron and enables decomposition of the log (“sawing”) via regularized CSG Boolean operations.

TL;DR: The main features of ADROS System are described: The 2D module DDC (Design and Drafting by Computer) and the 3D module SM (Solid Modeler).

TL;DR: A special purpose hidden line algorithm is presented for plotting perspective views of grid surfaces for functions defined in spherical polar coordinates that is linear time in the number of facets processed.

TL;DR: Processed images of the Shroud of Turin are computed, and they are presented with accompanying descriptions of patterns produced by the image processing which include unusual equations, shading, and convergence schemes.

TL;DR: Using the axonometric method for the uniform realization of parallel and central projection, very different problems of descriptive geometry can be solved by means of a uniform algorithm, based on a simple geometric idea.

TL;DR: The PHI-GKS proposal presented in this paper describes a system which offers the functionality provided in PHIGS and ensures compatibility to GKS/GKS-3D.

TL;DR: The well-established algorithm of realizing Boolean operations between 2D configurations can be readily extended to 3D solids when the latter is represented in the form of a set of bounding faces and loops and hence is computationally more efficient than the set membership classification method.

TL;DR: In the development of the CAD system, a hierarchical data structure called locating tree was used to describe extrusion dies and to store the information on how all the components in a die assembly are combined.

TL;DR: A methodology is given for the optimal design of glass molds based on CAD/CAE and surface response methodology.

TL;DR: For C2-surfaces of the Euclidean 3-space it is possible to determine curves called ls-curves using computer compatible differential geometric methods, which are dependent of projection rays and of light rays and can give an extremely good impression of the shape of a C1-surface.

TL;DR: Conception d'une interface pour l'echange d'informations entre deux systemes de conception assistee en particulier presentation de la norme ISO STEP.

TL;DR: The problem of defining Coons-like surface patches defined in terms of position vectors and direction vectors, which enables the rational scheme, devoted originally to define approximating surfaces, to create interpolating patches, is discussed.

TL;DR: Logiciel d'animation destine a l'apprentissage de l'informatique graphique (ecrit en langage C pour un poste de travail UNIX)

TL;DR: Systeme de conception assistee de faible cout; presentation du logiciel SIMAK pour la modelisation tridimensionnelle.