An interactive computergraphics system has been developed for the architecture profession which provides a “design environment” for the evaluation of building energy consumption. The system includes an integrated s...
ISBN:
(纸本)9780897910767
An interactive computergraphics system has been developed for the architecture profession which provides a “design environment” for the evaluation of building energy consumption. The system includes an integrated set of graphic input tools which generate the geometric and attribute data necessary for the determination of thermal load in buildings. In addition, a comprehensive set of graphical output routines has been created to allow the designer to visually interpret the results of alternative design strategies.
This paper presents an interactive method for specifying a path in space and time through a three-dimensional environment. A sequence is generated by showing the series of views along the path. The sequence is preview...
ISBN:
(纸本)9780897910767
This paper presents an interactive method for specifying a path in space and time through a three-dimensional environment. A sequence is generated by showing the series of views along the path. The sequence is previewed on a vector scope, and after it is interactively refined, each frame is rendered on a raster device. The path is represented by a B-spline to provide smooth, continuous motion. The timing along the path is also defined by a B-spline so that changes in velocity are smooth. The use of “path coherence” is introduced. The utilization of the available data from the a priori temporal and spatial path definition holds great promise for frame to frame coherence. The path coherence can be used to reduce the number of polygons which need to be considered in a viewed environment. This reduction makes the previewing of complex environments appear less cluttered. Furthermore, the computational expense of the culling and sorting operations in the visible line/surface determination is reduced. One sample usage of this is a tree-structured partitioned environment where the priority ordering of the environment must be changed only when the path crosses a partition boundary.
Colleges and universities are not meeting industry needs for graduates trained in the use or implementation of computer-aided design and manufacturing systems since few schools have experience in teaching CAD/CAM. Fur...
ISBN:
(纸本)9780897910767
Colleges and universities are not meeting industry needs for graduates trained in the use or implementation of computer-aided design and manufacturing systems since few schools have experience in teaching CAD/CAM. Furthermore, many Bachelor's-level graduates are going directly into industry, rather than pursuing graduate degrees, thereby compounding this problem. Members of this panel represent both schools and industry and together attempt to outline approaches to developing more extensive CAD/CAM emphasis in education, including- the role colleges and universities can or should play in addressing industry needs in this area- user- and implementor-oriented CAD/CAM education- CAD/CAM education as an integral part of university engineering curricula- problems encountered in organizing and implementing CAD/CAM curriculum- universities' relationships with *** is our hope that panelists' experiences will help guide schools in structuring CAD/CAM programs to best insure that the United States remain at the forefront of technology and compete industrially *** PuhlVictor LangerDonald P. GreenbergMark S. ShepardHerb VoelckerUniversities' Relationships With IndustryFrank PuhlAmerican industry needs engineers who have been brought up with the realization that computers are intimately involved in all aspects of design, analysis, and manufacturing. Industry, of course, needs engineers who are already trained in fundamental CAD/CAM principles and in solving real world problems using computers, as well as those who have been taught to be productivity- and *** help meet these needs, we must now provide answers to several significant questions:What part should industry play in encouraging and sponsoring research and education in CAD/CAM?How can we resolve conflicts between industries' “trade secrets” and universities' “open research”?How can industry and educational institutions work together to increase U.S. productivity so as to regain our compe
Vehicle operating policies are developed and a longitudinal controller is designed to satisfy the stringent performance criteria of an Automated Guideway Transit (AGT) System operating under model-reference control. T...
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Vehicle operating policies are developed and a longitudinal controller is designed to satisfy the stringent performance criteria of an Automated Guideway Transit (AGT) System operating under model-reference control. The complete control system is comprised of two parts, a model generator and a vehicle controller. The generation of a model velocity, based on ideal vehicle kinematics which include jerk and acceleration limiting, is examined with respect to the performance criteria required for safe operation. Using the phase-plane follower spacing policy, a vehicle controller is designed, evaluated, and implemented on an 8-bit microprocessor to control the vehicle through various maneuvers as simulated on an analog computer.
The task of assembling drawings and backgrounds together for each frame of an animated sequence has always been a tedious undertaking using conventional animation camera stands and has contributed to the high cost of ...
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An algorithm for determining visible lines or visible surfaces in polygonal form, at object resolution, is presented. The original scene must consist of non-intersecting planar polygons. The procedure relies on image ...
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This paper presents a new reflectance model for rendering computer synthesized images. The model accounts for the relative brightness of different materials and light sources in the same scene. It describes the direct...
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Depicting construction materials in colour enhances the realism of synthetic images and provides the architect with a powerful design tool. A computer-aided system for creating textured renderings of architectural des...
Depicting construction materials in colour enhances the realism of synthetic images and provides the architect with a powerful design tool. A computer-aided system for creating textured renderings of architectural designs is presented. This enables the designer to organize libraries of texture samples and details extracted from digital images of colour photographs of actual materials. Furthermore, buildings can be interactively positioned on an optically scanned site background and the textures mapped to simulate any desired view of the building. The system was designed so that it could be used quickly and easily by architects with little computer experience.
It is desirable to be able to use the B-spline surface formulation to describe a surface initially defined by a completely specified network of points to be interpolated. An appropriate set of B-spline control vertice...
It is desirable to be able to use the B-spline surface formulation to describe a surface initially defined by a completely specified network of points to be interpolated. An appropriate set of B-spline control vertices which will generate an interpolating surface can be determined by solving a set of simultaneous linear equations. These equations are derived, efficient algorithms are designed to solve them rapidly, and the implementation of this theory in a computer-aided geometric design system is presented.
Perceptually uniform color spaces can be a useful tool for solving computergraphics color selection problems. However, before they can be used effectively some basic principles of tristimulus colorimetry must be unde...
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ISBN:
(纸本)0897910214
Perceptually uniform color spaces can be a useful tool for solving computergraphics color selection problems. However, before they can be used effectively some basic principles of tristimulus colorimetry must be understood and the color reproduction device on which they are to be used must be properly adjusted. The Munsell Book of Color and the Optical Society of America (OSA) Uniform Color Scale are two uniform color spaces which provide a useful way of organizing the colors of a digitally controlled color television monitor. The perceptual uniformity of these color spaces can be used to select color scales to encode the variations of parameters such as temperature or stress. � ACM. All rights reserved.
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