Showing papers on "Computer graphics lighting published in 1992"

A fast and accurate light reflection model

Abstract: This multimedia paper elaborates on the comprehensive physicallybased light reflection model introduced by He et al. [ 11.To explain the model more fully, the paper gives an overview of the light reflection process at a surfiace, and employs an interactive graphical tool to demonstrate the reflection model’s directional behavior. To make the model more practical, the paper describes an accurate approximation of the reflection model. based on a spline surface, that is much faster to compute. The paper concludes with two animated sequences, which demonstrate some features of light reflection that are accounted for by the model. The full paper demonstrates the potential of interactive multimedia. It is written using MediaVlew [2], a system for authoring documents that include graphics, sound, video, and computer animation, CR

SIGGRAPH'91 Workshop Report Integrating Computer Graphics, Computer Vision, and Image Processing in Scientific Applications

Abstract: 1. I n t r o d u c t i o n Many scientific and engineering applications in such diverse fields as medicine, biomedical research, oil exploration and development, earth sciences, molecular modeling, and robotics rely on models extracted from and verified by empirical and simulation data. In these applications, data collected from one or more sources is analyzed and combined to form models that contain both geometric and non-geometric information. These models are then used for measurements, for simulations, and for understanding the structures and relationships that may exist among the data. Although the sources of da ta for each of these applications are different and considerable domain knowledge is required to analyze the data, there is also a great deal of commonality in the techniques used to visualize, quantify, and interact with the data and the models. These common techniques range from data enhancement, feature extraction, reconstruction of geometry and structure, to visualization and interaction with the resulting models, and computation and simulation based on the models. This apparent commonality of techniques led to the principal aim of the workshop: to identify common requirements, algorithms, architectures, and interaction techniques that form the core of many diverse practical applications. To focus the workshop, we excluded other and equally important common components of these applications, such as data management, data storage and compression, and distributed graphics to support cooperative work. From the submissions in response to the call for participation, we chose 21 position papers representing application areas in medicine, biomedical research, geology and geophysics, atmospheric sciences, computational fluid dynamics, robotics and vision applications, perception research, and two areas of computer science, namely data representation and visual programming. We grouped the position papers into four categories based on their main position(s): (i) multimodal da ta representation and interaction, (ii) segmenta.tion and interpretation, (iii) systems and software architecture, and (iv) da ta representation. We rejected papers that dealt solely with visualization or rendering unless their efficacy was illustrated in the context of a practical application. The list of participants, in alphabetical order, and their affiliations is as follows:

Physically Based Lighting Calculations for Computer Graphics: A Modern Perspective

Abstract: The light transport problem is discussed and formulated in a form convenient for Computer Graphics. Basic physical units are presented, and the rendering equation is formulated in these units. A survey of view dependent and zonal methods is presented, and the extension of these methods to non-diffuse surfaces and non-isotropically scattering media is outlined.

Teaching computer graphics using RenderMan

Abstract: A computer graphics course is extremely hardware system dependent, even more than most computer science courses. To produce high quality graphics images requires a high resolution system with extensive color capability and a fast cpu. Fortunately, the computer graphics capabilities of inexpensive systems have continued to increase. As this trend continues we need to consider changing the way we teach our computer graphics courses. In this paper I discuss a major shift in my teaching methods in the past year. Whereas, previously my students developed their own programs to create images, I have switched to the use of the Pixar RenderMan graphics package in the second graphics course and use it at the end of the first graphics course. I will discuss the rational for this change, mine and the students' experiences with it, and future planned modifications of the courses.

Graphics in the Views system

Abstract: The Views system is a new computing environment currently under development. One of its many facets is a graphics facility enabling structured picture objects to be easily entered and manipulated. Such pictures can be included as illustrations in text, as icons in the user interface and ultimately as the specification of all the visible aspects of the system; menus, scroll-bars, windows and so on. Views graphics objects can also be linked to other Views objects with invariants, resulting in pictures that automatically react to changes within other parts of the system. This document outlines the Views system and describes some of the design and implementation issues of the graphics facilities. 1991 Mathematics Subject Classification: 68U05, 68N99, 68P05. 1991 CR Categories: I.3.0, I.3.4, I.3.6, H.5.2, H.1.2.

Solid Modeling in Computer Graphics Education

Abstract: The first aim of this paper is to show the influence that graphics methods have had on the research activities carried out in solid modeling at the University “La Sapienza.” At the same time, we report our experience about the impact of solid modeling tools, equipped with a user-friendly user interface, on computer graphics education. In particular, we describe the solid modeler Minerva, implemented by computer graphics students and currently used as a didactic tool in our graphics course, which allows students to experiment with affine transformations, and to view models, structure definitions, surface equations, and solid operations.

EPLOT: a machine-independent graphics system

Abstract: EPLOT was designed as an inexpensive and interactive small graphics library to be run on workstations, stand-alone microcomputers and mainframes, or microcomputers used as graphics terminals. It started as a minor extension to the machine-independent UNIX PLOT library but now includes capabilities for menu and mouse operations, animation, and other functions required in student projects. EPLOT allows the easy development and transfer of interactive graphics programs between SUN, MSDOS, Amiga, ATARI, and Apple Macintosh systems. It has played an important role in the philosophy of the computer graphics course offered at the authors' institution. The scope of EPLOT is demonstrated through a series of projects and programs. >

Graphics and package design

Abstract: When we defined marketing in chapter 1 we did not specify: Who identified the customer needs? Who satisfied them? Who anticipated them? Who fixed the profit?

Computer Graphics in Visual Effects

Abstract: Over the last few years, the use of computer graphics in feature film visual effects has increased dramatically. We will describe some of the computer graphics techniques used in generating realistic imagery and integrating it into live action photography, and discuss this interesting blend of art and computer technology.