摘要:

AbstractThis paper presents a novel approach to the reconstruction of geometric models and surfaces from given sets of points using volume splines. It results in the representation of a solid by the inequality f(x,y,z) ≥ 0. The volume spline is based on use of the Green's function for interpolation of scalar function values of a chosen “carrier” solid. Our algorithm is capable of generating highly concave and branching objects automatically. The particular case where the surface is reconstructed from cross‐sections is discussed too. Potential applications of this algorithm are in tomography, image processing, animation and CAD for bodies with complex s

ISSN:0167-7055    

DOI:10.1111/1467-8659.1440181

出版商:Blackwell Science Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractThis paper describes the results of experiments with accelerated ray tracing on a virtual shared‐memory parallel computer and attempts to determine whether this kind of architecture would be suitable for an interactive ray tracing system. The machine used, the Kendall Square Research KSR1, is described in sufficient detail for its novel features to be appreciated. The paper describes a new ray tracer written specifically to capitalise on the KSR1 's features. Models used in the experiments include well‐known test cases from the Haines database, permitting comparison with previously reported results. The results show that the program scales well up to 230 processors, and that with progressive rendering initial rendering times can be reduced to as little as 0.2 second on 32 process

ISSN:0167-7055    

DOI:10.1111/1467-8659.1440189

出版商:Blackwell Science Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractConventional 2D or 3D texturing methods do not permit an efficient simulation of highly complex structured textures like fire, fur, cotton, etc. More recent techniques, using specific kinds of 3D textures, such as hypertextures or texels based on volume rendering algorithms, are more interesting, for the simulation of such special types of textures. Unfortunately, these techniques remain still restricted because either they need a functional modelling of the object, as it is the case of hypertextures, or they are strictly limited to one specific kind of texture, as it is the case of texels.In this paper we present a new approach for applying a wide range of very different types of highly complex structured textures (fur, fire, water drops, cotton, fume, …) on every kind of objects. This method is particularly based on the geometrical information given by a geometrical model (as the polyhedral or CSG modelling). Like hypertextures or texels, our method uses the volume density rendering, but it isfree of the serious above mentioned restrictions of these methods. In addition, it allows an easy and very intuitive control of the global geometrical shape of generated textures. Its manipulation is simple evenfor a novice use

ISSN:0167-7055    

DOI:10.1111/1467-8659.1440203

出版商:Blackwell Science Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractArchitectural scenes usually have some peculiar properties, like parallel surfaces, symmetry, instantiation, easy clustering, etc. These properties can be used by visualization algorithms in order to improve the solution of the hidden surface removal problem.This paper presents some practical implementation policies for the binary space partition algorithm proposed by Fuchs. They take advantage of the characteristics found in architectural scenes. These suggestions help to minimize both the time needed to build the tree and the memory space used. Five optimization techniques are presented and applied to fourteen architectural scenes.

ISSN:0167-7055    

DOI:10.1111/1467-8659.1440217

出版商:Blackwell Science Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractIn this paper, we describe a new buffer architecture called the Compositing Buffer. Although it is based on the A‐buffer architecture described by Carpenter1, the new architecture introduces two important ideas which make image generation more flexible. The first idea is the storing of bitmask index instead of the bitmask. This allows accurate images to be generated while at the same time, minimising memory usage. The second idea is the introduction of the concept of dynamic object. This allows images to be edited interactively. Applications of the two ideas will also be discussed in the pape

ISSN:0167-7055    

DOI:10.1111/1467-8659.1440229

出版商:Blackwell Science Ltd    

年代:1995

数据来源: WILEY