ISSN:1049-8907    

DOI:10.1002/vis.4340030202

出版商:John Wiley&Sons, Ltd    

年代:1992

数据来源: WILEY

摘要:

AbstractThis paper proposes an integrated rendering algorithm for visualizing 3D volumetric and geometric data, such as surfaces, lines and points, simultaneously with depth information, and other algorithms for improving the performance of the rendering process of the first. The first algorithm extends a volume rendering algorithm based on ray‐tracing so that it can handle both 3D volumetric and geometric data. It processes these data in accordance with their original representation formats to eliminate conversion artefacts such as spurious or missing surfaces, and also gives special treatment to volume segments so as to avoid errors in visibility at the intersections between volume segments and geometric data. The other algorithms employ adaptive termination of ray‐tracing, elimination of rays that do not intersect the volume, and adaptive undersampling over an image plane. These improve the performance by three to seven times over the brute‐force approach. The cost and versatility of the algorithm are evaluated by using data from the results of 3D computational fluid dyn

ISSN:1049-8907    

DOI:10.1002/vis.4340030203

出版商:John Wiley&Sons, Ltd    

年代:1992

数据来源: WILEY

摘要:

AbstractBeautiful 3‐D figures of ballerinas have been generated by a non‐professional artist using a personal computer with commercially available ray‐tracing software and metaballs. This paper describes how these beautiful artistic creations have been drawn using very limited computational

ISSN:1049-8907    

DOI:10.1002/vis.4340030204

出版商:John Wiley&Sons, Ltd    

年代:1992

数据来源: WILEY

摘要:

AbstractWe describe a new method for modelling braids and certain classes of knots and links, and how they may be visualized. The method uses generalized cylinders built around a bicubic spline centre line. We also show how multi‐stranded, recursive, hawser laid ropes can be modelled using related technique

ISSN:1049-8907    

DOI:10.1002/vis.4340030205

出版商:John Wiley&Sons, Ltd    

年代:1992

数据来源: WILEY

摘要:

AbstractIn this paper we give a method for generating surface appearances with a maximum number of 15 supervising parameters. Surfaces are made up of fast spatial changes (high spatial frequencies) and slow spatial changes (low spatial frequencies). The generator is a mixture of several techniques generally used in image synthesis, image animation, in CAD and in signal processing.A model for generating fish scales is actually under development. The flexibility of the method makes it suitable for many other applications, such as 3D regular patterns, tissue‐like texture, et

ISSN:1049-8907    

DOI:10.1002/vis.4340030206

出版商:John Wiley&Sons, Ltd    

年代:1992

数据来源: WILEY

摘要:

AbstractThis paper proposes an efficient direct imaging algorithm for constructing iso‐surfaces from regular and rectilinear 3D grid data in scientific and engineering visualization. The basic idea is to generate and draw polygons simultaneously by processing the cells spanned by grids in decreasing order of distance from the current viewpoint. Iso‐surfaces are generated in five or six tetrahedrons into which the cells are subdivided, and are sent to a graphics device or drawn into a frame buffer on the fly. The execution order of each of the tetrahedrons is identical and is determined by the current viewpoint. Since the algorithm does not need to store intermediate polyhedral data and does not require a depth buffer memory for hidden surface removal, it is applicable to a large quantity of data on a 3D grid, such as computed tomography (CT) data. It is also particularly powerful for semi‐transparent display, because transparency calculation can be reduced to image compositing operations if the polygons are drawn in order of theirz‐depth from the current vi

ISSN:1049-8907    

DOI:10.1002/vis.4340030207

出版商:John Wiley&Sons, Ltd    

年代:1992

数据来源: WILEY

ISSN:1049-8907    

DOI:10.1002/vis.4340030208

出版商:John Wiley&Sons, Ltd    

年代:1992

数据来源: WILEY

ISSN:1049-8907    

DOI:10.1002/vis.4340030201

出版商:John Wiley&Sons, Ltd    

年代:1992

数据来源: WILEY