ISSN:1049-8907    

DOI:10.1002/vis.4340060302

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractWe present an approach to articulated figure motion in which motion tasks are defined in terms of goals and ratings. The agents are dynamically‐controlled robots whose behaviour is determined by robotic controller programs. The controller programs for the robots are evaluated at each time step to yield torque values which drive the dynamic simulation of the motion. We use the AI technique of genetic programming (GP) to automatically derive control programs for the agents which achieve the goals. This type of motion specification is an alternative to key framing which allows a highly automated, learning‐based approach to generation of motion. This method of motion control is very general (it can be applied to any type of motion), yet it allows for specifications of the types of specific motion which are desired for a high quality animation. We show that complex, specific, physically plausible and aesthetically appealing motion can be generated using these meth

ISSN:1049-8907    

DOI:10.1002/vis.4340060303

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractAnimators frequently choreograph complex motions for multiple objects that interact through collision and obstruction. In such situations, the use of physically based dynamics to confer visual realism creates challenging computational problems. Typically forward simulation is well understood, but the inverse problem of motion synthesis—that of synthesizing motions consistent both with physical law and with the animator's requirements—is generally tedious and sometimes intractable. We show howN‐body inverse problems can be formulated as optimization tasks. We present a simply stated, but combinatorially formidable example that exhibits all of the essential sources of complexity common toN‐body motion synthesis, and show how it can be solved approximately using heuristic methods based on evolutionary comp

ISSN:1049-8907    

DOI:10.1002/vis.4340060304

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractSeveral CG researchers have simulated impressive ocean waves so far. Recently, other researchers have succeeded in simulating waterfalls by employing a mass of particles. However, visual simulation of water currents having complex surfaces, such as mountain streams and turbulent water, still remains a challenging problem thanks to their complicated patterns of behaviour. Effective simulation methods for water currents are expected to have abilities to represent the following remarkable behavioural visual features of water: the appearance of a pool, an obstacle avoidance flow, a fluent flow, a flow into an open space, the collision and the confluence of flows and the occurrence of splashes.In this paper, we present a new type of particle‐based simulation method for complex water currents which is not based on strict fluid dynamics but rather classified into a ‘quasi‐physically‐based’ simulation method constructed on the basis of algorithmic approaches. We first present a simple behavioural model of a ‘water‐particle’. Next, we propose a method for generating CG images of water currents from a set of water‐particles. Finally, we demonstrate the ability of our method by showing several examples

ISSN:1049-8907    

DOI:10.1002/vis.4340060305

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractAn interesting problem in the oil and gas industry is the visualization of the movement of oil and gas in porous media. An example of such a medium is a rock sample with some distribution of holes (pores) connected by channels (pore throats), the solid parts of the rock are called grains. In our work we have simulated the porous medium using a pointer‐based octree, representing these pores and grains. This data structure allows us to model the connectivity of the pores and thus visualize fluid penetration within the medium. Whereas earlier models represent a serious simplifications or two dimensional homogeneous layers, our model provides us with a statistically accurate distribution in three dimensions and a more accurate representation of the connectivity.In this paper we present our data structure and the techniques which were used to create models of porous media and their porous networks. Next, we present algorithms for connectivity in octrees and we show how to apply them to modelling and visualization of fluid penetration in porous medi

ISSN:1049-8907    

DOI:10.1002/vis.4340060306

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

ISSN:1049-8907    

DOI:10.1002/vis.4340060307

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

ISSN:1049-8907    

DOI:10.1002/vis.4340060308

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY