ISSN:1049-8907    

DOI:10.1002/vis.4340060102

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractParticle systems have been extensively used for modelling fluid flow. But if a large number of particles are required, this can lead to unreasonably large amounts of memory usage. This is because the position and velocity is stored explicitly for each particle. Solid texture, on the other hand, stores parameters implicitly, by means of addressing small look‐up tables. This paper presents a method of implicitly storing particles, and illustrates its use with the modelling of large waterfall

ISSN:1049-8907    

DOI:10.1002/vis.4340060103

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractThis paper introduces an animation system directed by order. High‐level operations such as moving, turning, rolling and bouncing on a flat surface provide an easy‐to‐use interface to build animations. The underlying animation system relies on a constraint‐based deformation model.Previously, to build an animation the user had to break up the desired animation into a list of deformations composed of a set of constraints. In addition to each constraint, he had to control the size and the shape of the deformed area as well as the shape of the deformation. The goal of the order‐controlled animation is to encapsulate all the parameters of the deformations. Indeed, using these high‐level operations the underlying deformations are completely transparent to the user.Before introducing these operations, we will present some extensions of the deformation model such as the generalized shape of the deformed area and a rotating movement combined with the deformation. We also explain how to control velocity and a

ISSN:1049-8907    

DOI:10.1002/vis.4340060104

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractVisualizing the flow of air or fluids is especially challenging because of their transparency and possible high velocity. Complex patterns are created when the flow is over or around an object. Our aim is to visualize the flow in three dimensions, eliminating the need for mentally piecing the flow from two‐dimensional slices. We have applied the well‐known ray casting technique to visualize the flow around an aircraft wing. During ray casting, when the ray does not intercept the lattice points, linear and B‐spline hyperpatch interpolations are used to estimate the colour. We describe the shading equation, and compare the linear and the B‐spline hyperpatch interpolation schemes during ray casting. Several images are produced to show the difference in the image quality of these two methods, and their image generati

ISSN:1049-8907    

DOI:10.1002/vis.4340060105

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractAn important problem in the production of an animation sequence is the great amount of information necessary to control and specify the motion. Specification of complex animation sequences with a smaller amount of information is possible if they are built over some abstracted sequences. Abstraction supports dealing with complexity by structuring, so that the necessary features are made available while those that are not necessary are hidden. In our work, motion abstraction is used to build complex animation sequences with the help of object‐oriented concepts. A parametric key‐frame interpolation method is used for producing the in‐between frames of an animation sequence. The parameters that define the motion of a model, in our work, are position, orientation, size, shape and colour. Orientation transformations are implemented by unit quater

ISSN:1049-8907    

DOI:10.1002/vis.4340060106

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

ISSN:1049-8907    

DOI:10.1002/vis.4340060107

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

ISSN:1049-8907    

DOI:10.1002/vis.4340060108

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY