SIGGRAPH

Are computer graphics displays as effective as they should be? Are they as appealing as they could be? How can displays of information acquire more impact? How can they be made more memorable. Questions like these are being asked frequently in the ...

In many three-dimensional imaging applications the three-dimensional scene is represented by a three-dimensional array of volume elements, or voxels for short. A subset Q of the voxels is specified by some property. The objects in the scene are then ...

All of the information necessary to perform the polygon set operations (union, intersection, and difference) and therefore polygon clipping can be generated by a single application of a process called polygon comparison. This process accepts two or more ...

A process for creating and displaying stellations of a given polyhedral solid is described. A stellation is one of many star-like polyhedra which can be derived from a single solid by extending its existing faces. A program has been implemented which ...

Accurate X,Y position determining digitizers presently require a precision array of wires embedded in the tablet. In rear-projection tablets these wires tend to limit the optical quality of images projected on the screen. Principles of acoustic radar ...

An interactive, dynamic map has been built using videodisc technology to engage the user in a simulated “drive” through an unfamiliar space. The driver, or map reader, is presented with either sparsely sampled sequences of images taken by single frame ...

A frame buffer architecture is presented that reduces the overhead of frame buffer updating by three means. First, the bit-map memory is (x,y) addressable, whereby a string of pixels can be accessed in parallel. Second, the pixel-change operation is ...

The results of expected performance analysis and simulation of three multiple processor Z-buffer architectures are presented. These architectures have been proposed as approaches to applying many processors, working in parallel, to the task of rapidly ...

Accompanying the rapid development of integrated circuit fabrication technology has been a parallel, but slower, development of IC design techniques and systems. Recent approaches to IC design enable individual designers to consider developing their own ...

A series of maps presenting the spatial distribution of the tabular data from the 1972 County and City Data Book is discussed. Using an automated mapping procedure developed on a minicomputer by two non-computer scientists, 196 choropleth maps of county-...

Spatial Data Management is a technique for organizing and retrieving information by positioning it in a spatial framework. Data is accessed in a Spatial Data Management System (SDMS) via pictorial representations which are arranged in space and viewed ...

The design concepts and languages of a geographic information system ATLAS (Administration and Total Landuse Analysis Support system) are proposed.

The database structure is designed based on the geographic information structure concepts which contain ...

Computer graphics has become an everyday tool for an engineer, scientist, and technician. Only within the last year or so has the business community demonstrated a real interest in computer graphics for their requirements. While the technically trained ...

Raster scanned graphics terminals provide several features not found in standard line drawing displays. Among them are area fill and an extensive color palette. Hardware support for such functions is becoming cost effective and available in a variety of ...

Most man-made objects can be closely approximated by bodies whose surfaces are composed of portions of second-order (quadric) surfaces. These surfaces include elliptic, hyperbolic, and parabolic cylinders, as well as quadric cones, paraboloids, ...

PICTUREBALM is a portable, interactive, LISP-based language system for graphics applications programming. PICTUREBALM's design and initial experimental implementation is described from the point of view of both the user and the language system ...

The general purpose graphics systems of the future will need a simple logic for visual objects—one structure underlying both text and graphics. As an experiment, perhaps the immediate handling of visual objects by the user can provide the starting point ...

A recurrent problem in generating realistic pictures by computers is to represent natural irregular objects and phenomena without undue time or space overhead. We develop a new and powerful solution to this problem by modeling objects as sample paths of ...

Fractals are a class of highly irregular shapes that have myriad counterparts in the real world, such as islands, river networks, turbulence, and snowflakes. Classic fractals include Brownian paths, Cantor sets, and plane-filling curves. Nearly all ...

Hierarchical representations of 3-dimensional objects are both time and space efficient. They typically consist of trees whose branches represent bounding volumes and whose terminal nodes represent primitive object elements (usually polygons). This ...

This paper presents a new hidden surface algorithm. Its output is the set of the visible pieces of edges and faces, and is as accurate as the arithmetic precision of the computer. Thus calculating the hidden surfaces for a higher resolution device takes ...

This paper describes a new algorithm for solving the hidden surface (or line) problem, to more rapidly generate realistic images of 3-D scenes composed of polygons, and presents the development of theoretical foundations in the area as well as ...

A system has been developed to display color stereographic time-lapsed sequences of outputs of three-dimensional atmospheric models. Contour lines and wind vectors derived from a model can be overlaid on a geostationary satellite image or displayed with ...

A highly interactive computer graphics system has been implemented for the display and analysis of high-resolution radio images which are produced by the Very Large Array radio telescope being built by the National Radio Astronomy Observatory. Some of ...

A system for preparation and manipulation of color graphics video frames is described. The system commands are designed for use by a class instructor (who is not a computer science person) in preparation and delivery of lectures to a remote site. The ...

A method for generating arbitrary terrain models, including trees, bushes, mountains, and buildings, is described. Procedure models are used to combine fundamental data elements in the creation of unified objects comprising the terrain model. As an ...

A color interactive display system which produces images of three-dimensional polygons and labels on a frame buffer display device is being developed. The entire image is scan converted and written into the frame buffer whenever it is modified. Since an ...

Our society is increasingly relying on symbolic and imaginal communication to augment written and spoken language (advertising graphics, logos and corporate I.D.s, satellite weather maps, international traffic, dashboard symbols, etc.). Nowhere are ...

The optical printer can be considered as an optical analog computer, which can perform geometric transformations and simple arithmetic operations on pictures very efficiently. The principles of operation of the printer are explained, and many of its ...

The adaptation and generalization of scan and slit-scan animation stand techniques for use in computer generated animation is discussed. Scan and slit-scan techniques are based on moving artwork, camera, and, for slit-scan, a thin aperture while the ...