The Perspective Representation of Functions of Two Variables

Abstract

A perspective transformation is developed whereby an object in space as viewed from an arbitrary point can be projected into a plane and plotted. Families of curves which can be used to define such an object are discussed and examples are given. An algorithm which eliminates the plotting of hidden portions of the object is discussed.

Graphical Display and Statistical Evaluation of Data Gained by Long-Term Ambulatory Intragastric pH Monitoring

“…same drug treatment, same disease) to be presented, it would be desirable to concomitantly present the indi vidual curves and the behavior of the whole group. This may be achieved by creating pseudo-3D-graphs [2] in which reduced curves from each individual are displayed simultaneously. In this case, pH values are plotted vertically versus both time and num ber of individuals.…”

Representações Gráficas Espaciais Em Geociências Auxiliadas Por Computador

“…Os principais algoritmos para a eliminacflo de linhas ocultas para desenho em perspectiva de superficies representadas por malhas regulares foram aprescntados por Kubert et al (1968), Williamson (1972), Graham (1972), Wright (1973 Entre esses algoritmos, foi escolhido 0 publicado por Wright (1973), que, por ser bastant e simples, 6 facibuente implementado em pro gram as de cornputacao para dese nho em perspectiva de superffcie. o algoritmo de Wright trabaIha no plano de projecdo, que pode ser ora a tela do monitor de video, ora 0 plano da mesa do plotter.…”

A Technique for Plume Visualization in Power Plant Siting

“…Not only did he design the software used to process digitized terrain data supplied by the U.S. Geological Survey, but he also provided insight, preliminary software, and a reference 7 for solving the "hidden line" problem, which was incorporated in the "conceptual camera" software package written by the author.…”