7#*8C(6677777777 7 77777 87778%8 8'8+78/8185898;8?Chapter 1 Virtual Worlds Jean-Claude Heudin International Institute of Multimedia Ple Universitaire Lonard de Vinci Jean-Claude.Heudin@devinci.fr 1.1. Introduction Imagine a virtual world with digital creatures that looks like real life, sounds like real like and even feels like real life. Imagine a virtual world with not only nice three-dimensional graphics and animations, but also with realistic physical laws and forces. This virtual world could be familiar, reproducing some parts of our reality, or unfamiliar, with strange physical laws and artificial life forms. 1.1.1. Sub-section This is only a sample text for a sample chapter. 1.2. Virtual Worlds 1.2.1. The synthesis of real and imaginary universes In the last few years, there has been an increasing interest in the design of artificial environments using image synthesis and Virtual Reality (VR). The emergence of industry standards such as VRML [Hartman 1996] is an illustration of this growing interest. During the same period of time, the field of Artificial Life (ALife) has addressed the study of complex phenomena such as self-organisation, reproduction, development and evolution of artificial life-like systems. However, very few works have used an ALife approach together with advanced three-dimensional (3D) graphics or VR techniques. Considering recent advances in both fields, catalyzed by the development of Internet, a unified approach seems to be one of the most promising trend of research for the synthesis of realistic and imaginary virtual worlds. 1.2.2. Virtual Reality The roots of VR may be traced back to the early 1940s, when an entrepreneur by the name of Edwin Link developed flight simulators for forces in order to reduce training time and costs. The early simulators were complex mechanical systems with a relatively poor illusion of flight. In 1965, Ivan Sutherland published a paper called The Ultimate Display in which he described the computer as a window through which one beholds a virtual world [Sutherland 1965]. The term Artificial Reality was first coined by Myron W. Krueger in the mid 1970s to cover the Videoplace project [Krueger 1991] and the head-mounted 3D viewing technology that originated with Ivan Sutherland. During the following years, the terms Virtual Cockpits, Virtual Environment and Virtual World were used to describe specific projects. In 1989, Jaron Lanier, CEO of Virtual Presence Ltd., coined the term Virtual Reality to bring all these virtual projects under a single field of research. It then refers typically to 3D graphical environments with stereo viewing goggles and reality gloves. In state-of-the-art VR, special input/output devices create the experience of being immersed in the virtual environment. In 1994, the Virtual reality Modeling Language (VRML) was just a concept. Presently, it is a de facto standard that allows to describe objects and combine them to create interactive simulations that incorporate 3D real time graphics, motion physics and multi-user participation on the World-Wide-Web. A first approach in categorizing Virtual reality experiments leads to consider four basic classes (a more formal definition of VR is given by [Verna 1998]): 1. Virtual Reality refers to the modeling of an existing real environment and visualizing it in 3D. 2. Augmented Reality means adding virtual information or objects which not belong to the orginial scene, like virtual objects included in real time onto a live video. 3. Released Reality releases real worlds constraints, like for instance the inability to reverse time or to escape from the law of gravitation. 4. Artificial Reality refers to as the ability to design worlds that do not exist and to display them in 3D. In all of these approaches, two other important concepts are involved: immersion and interaction. In the most well known case, the operator evolves in the generated world thanks to data suit, head mounted display and data gloves. The idea is to feel physically present in the virtual environment and to interact with it. In order to keep a coherent feeling of presence, an ideal immersive system should disconnect the operator from its real environment.  Figure. 1. The VIEW system developed at the NASA Ames Research Center under the direction of Scott Fisher. 1.2.3. Artificial Life Artificial Life is a new field of research initiated by Christopher Langton at a workshop held at Los Alamos in 1987 [Langton 1988]. He coined Artificial Life as the study of man-made systems that exhibit behaviors characteristic of natural living systems, such as self-organization, reproduction, development and even evolution. It complements the traditional biological sciences concerned with the analysis of living organisms by attempting to synthesize and study life-like behaviors within computers or other alternative media. By extending the empirical foundation upon which biology rests beyond the carbon-chain-based life that has evolved on Earth, Artificial Life can contribute to the theoretical biology by locating life-as-we-know-it within the larger context of life-as-it-could-be, in any of its possible physical incarnations [Langton 1994]. It exists a large diversity of trends that have been taken and Alife seems to be best described by a list of related research programs: Evolutionary Computing, biomorphs and ontogenetically realistic development processes, Cellular Automata, Autocatalytic Networks, Simulation of Ecologycal Systems, Evolving Robots, Evolvable Hardware, Artificial Nucleotides, and many others including related philosophical issues. As one could understand, there is a large number of possible approaches concerned with attemps to synthesize life-like phenomena. However, the key concept in all these works is emergent behavior. Thus, the general approach is rather bottom-up modeling than working analytically downward from a complex all to a set of simpler components. In contrast, ALife starts at the bottom, viewing a system as a large population of simple agents, and works upwards synthetically, constructing large aggregates of autonomous rule-governed agents which interact with one another nonlinearly. Therefore, we can sum up the essential features of an Alife model by the following points [Langton 1988]: 1. The model consists of a population of simple agents. 2. There is no single agent that directs all of the other agents. 3. Each agent details the way in which a simple entity reacts to local situations in its environment, including encounters with other entities. 4. There is no rule in the system that dictate global behaviors. 5. Any behavior at levels higher than the individual agents is therefore emergent. As should be expected, in recent years, there has been two shifts in emphasis. In the first shift, ALife studies are characterized by more connections to real systems exemplified by the growing number of works in Evolutionary Robotics [Brooks 1994] and Evolvable Hardware [Sanchez 1996]. In the second shift, researchers design more sophisticated artificial worlds where evolving population are studied, including models of physicall dynamics [Husbands 1997]. This second shift of Alife along with VR represent the two roots of the emerging Virtual Worlds approach. 1.2.4. Virtual Worlds Experiments In the last few years, the term Virtual Worlds has refered to VR applications or experiences. We extend here the use of this term to describe experiments that deal with the general idea of synthesizing digital worlds on computers [Heudin 1998]. Thus, Virtual Worlds (VW) could be defined as the study of computer programs that implement digital worlds with their own physical and biological laws. Constructing such complex artificial worlds seems to be extremely difficult to do it in any sort of complete and realistic manner. Such a new discipline must benefits form a large number of works in various fields: VR and advanced 3D Graphics, ALife, Cellular Automata, Evolutionary Computation, Simulation of Physical Systems, and more. Whereas VR has largely concerned itself with the design of 3D graphical spaces and ALife with the simulation of living organisms, VW is concerned with the simulation of entire worlds and the synthesis of digital universes. This approach is something broader and more fundamental and can contribute to a better understanding of our real universe. Throughout the natural world, at any scale, from particles to galaxies, one can observe phenomena of great complexity. Research done in traditional sciences such as biology and physics has shown that the basic components of complex systems are quite simple. It is now a crucial problem to elucidate the universal principles by which large numbers of simple components, acting together, can self-organize and produce the complexity observed in our universe. Therefore, VW is also concerned with the formal basis of synthetic universes. In this framework, the synthesis of virtual worlds offers a new approach for studying complexity. 1.3. Next section This is only a sample text for a sample chapter. References Brooks, R., & Maes, P. (ed.), 1994, Artificial Life IV, MIT Press (Cambridge). Hartman, J., & Wernecke, J., 1996, The VRML 2.0 Handbook - Building Moving Worlds on the Web, Addison-Wesley Developers Press (Reading). Heudin, J.C. (ed.), 1998, Virtual Worlds - Proceedings of the First Int. Conf. on Virtual Worlds, Springer-Verlag Lecture Notes in Computer Science (Berlin), 1434, 5. Husbands, P., & Harvey, I. (ed.), 1997, Fourth European Conference on Artificial Life, MIT Press (Cambridge). Krueger, M.W., 1991, Artificial Reality II, Addison-Wesley (Reading). Langton, C.G., 1988, Artificial Life, in Artificial Life, edited by C.G. Langton, SFI Studies in the Sciences of Complexity, Addison-Wesley (Reading), 6, 1. Langton, C.G. (ed.), 1994, Artificial Life III, SFI Studies in the Sciences of Complexity, Addison-Wesley (Reading), 17. Sanchez, E., & Tomassini, M. (ed.), 1996, Towards Evolvable Hardware - The Evolutionary Engineering Approach, , Springer-Verlag Lecture Notes in Computer Science (Berlin), 1062. Sutherland, I., 1965, The Ultimate Display, Proceedings IFIP Congress, 506. Verna, D., & Grumbach, A., 1998, Can we define Virtual Reality? The MRIC Model, in Virtual Worlds, edited by J.C. Heudin, Springer-Verlag Lecture Notes in Computer Science (Berlin), 1434, 41.  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