ISSN:1049-8907    

DOI:10.1002/vis.4340020202

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

ISSN:1049-8907    

DOI:10.1002/vis.4340020203

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

摘要:

AbstractIn most currently produced computer generated animation there is significant visual information that is literallynever seenbecause of the characteristics of the human visual system. By tailoring the rendering of animation images to match the characteristics of human visual perception, significant computational and image storage savings can be obtained while retaining perceived animation quality.Vision research indicates that the human visual system processes two information channels. Thetransientchannel rapidly processes low spatial resolution full colour information. Thesustainedchannel processes high spatial resolution luminance information at a much slower rate.This paper discusses how the rendering of animation images can be accomplished to match these perception characteristics and achieve significant savings while maintaining animation quality. Computation and storage savings of up to 80 per cent are possible. Several animation segments have been produced to demonstrate the viability of this approach.

ISSN:1049-8907    

DOI:10.1002/vis.4340020204

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

摘要:

AbstractWe describe techniques for the visualization of a scalar‐valued function defined over a surface. The main interest focuses on a 4D graph of such a function and projections of this graph into 3‐space. The paper also contains methods for testing the smoothness of interpolants over surfaces and a short tutorial on fundamental ideas of multidimensional descriptive geometry which can be helpful in several areas of scientific visualizat

ISSN:1049-8907    

DOI:10.1002/vis.4340020205

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

ISSN:1049-8907    

DOI:10.1002/vis.4340020206

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

摘要:

AbstractThis paper presents geometric modelling methods for branching object generation and animation with cubic Hermite curves. The procedure for creating a branching object involves two steps. First, the skeleton of an object is constructed. The skeleton consists of geometrical and topological information about the segments of the object. Secondly, cubic Hermite curves are used to deform and join consecutive segments in the skeleton in order to form the body of the object withC1continuity. Cubic Hermite curves are also used to deform partial segments which allow an object to grow with desirable continuity in space and time. The techniques are easily implemented on any computer and allow the user to create a branching object using objects which have diverse shapes as segments.

ISSN:1049-8907    

DOI:10.1002/vis.4340020207

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

摘要:

AbstractWe develop physically‐based graphics models of non‐rigid objects capable of heat conduction, thermoelasticity, melting and fluid‐like behaviour in the molten state. These deformable models feature non‐rigid dynamics governed by Lagrangian equations of motion and conductive heat transfer governed by the heat equation for non‐homogeneous, non‐isotropic media. In its solid state, the discretized model is an assembly of hexahedral finite elements in which thermoelastic units interconnect particles situated in a lattice. The stiffness of a thermoelastic unit decreases as its temperature increases, and the unit fuses when its temperature exceeds the melting point. The molten state of the model involves a molecular dynamics simulation in which ‘fluid’ particles that have broken free from the lattice interact through long‐range attraction forces and short‐range repulsion forces. We present a physically‐based animation of a thermoelastic model in a simulated physical world populated by ho

ISSN:1049-8907    

DOI:10.1002/vis.4340020208

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

摘要:

AbstractAs virtual worlds become increasingly complex,task levelinteraction with virtual actors becomes correspondingly important. The control problem simply becomes unmanageable if we try to interact with synthetic agents at the wrong level of abstraction. However, it is not sufficient merely to implement a set of behaviours for a virtual actor; we require some mechanism for selecting and sequencing motor skills appropriate to the current behavioural goalsandthe states of other objects and actors in the virtual environment. In this paper we will describe a mechanism for linkingperceptionandactionto generate routine behaviours in a process we callmotor planning.We present our implementation of the skill network, in which motor skills are the nodes and the arcs represent inhibitory and excitatory connections, including extensions to this architecture based on recent work in robotics. We characterize the domain of motor planning, i.e. what kinds of behaviour can it account for, and when will it fail? We close with a discussion of the limits of our current implementation and work that remains to be done.

ISSN:1049-8907    

DOI:10.1002/vis.4340020209

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

ISSN:1049-8907    

DOI:10.1002/vis.4340020201

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY