We describe a new approach to the behaviour of 3D environments that supports the definition of ph... more We describe a new approach to the behaviour of 3D environments that supports the definition of physical processes and interactive phenomena. The work takes as a starting point the traditional event-based architecture that underlies most game engines. These systems discretise the environments' Physics by separating the objects' kinematics from the physical processes corresponding to objects interactions. This property has been used to insert a new behavioural layer, which implements AI-based simulation techniques.
2004 IEEE International Conference on Systems, Man and Cybernetics (IEEE Cat. No.04CH37583), 2004
In this paper, we describe such an environment, in which the user can be presented in real-time w... more In this paper, we describe such an environment, in which the user can be presented in real-time with an alternative range of consequences for a given interaction with virtual world objects, thus inducing various perceptions of causality. From a systemic perspective, we can adopt a pragmatic approach, inspired from Humian philosophy, which considers that causal relations are established by the user in response to certain event cooccurrences. To control causal perception in VR, the system comprises the following components: a visualisation engine, an Event Recognition System (together with its specific event formalism that supports event modification), and a causal engine as an Event Modification System, which selects co-occurring events on a rule-based manner. A search process, evaluates alternative consequences using semantic and spatiocontiguity information, such as comparison between candidate objects on which the action consequences should be applied. A first prototype has been fully implemented and is described together with an example real-time simulation.
We describe a new approach to the behaviour of 3D environments that supports the definition of ph... more We describe a new approach to the behaviour of 3D environments that supports the definition of physical processes and interactive phenomena. The work takes as a starting point the traditional event-based architecture that underlies most game engines. These systems discretise the environments' Physics by separating the objects' kinematics from the physical processes corresponding to objects interactions. This property has been used to insert a new behavioural layer, which implements AI-based simulation techniques. We introduce the rationale behind AI-based simulation and the techniques we use for qualitative Physics, as well as a new approach to world behaviour based on the induction of causal impressions. This is illustrated through several examples on a test environment. This approach has implications for the definition of complex world behaviour or non-standard physics, as required in creative applications.
Proceedings of the 12th annual ACM international conference on Multimedia - MULTIMEDIA '04, 2004
We introduce a novel approach to the creation of Virtual Reality Art installations, which support... more We introduce a novel approach to the creation of Virtual Reality Art installations, which supports the design of alternative worlds, in which laws of Physics can be redefined to induce new user experiences. To implement this concept of "Alternative Reality", we have used Artificial Intelligence techniques to support the definition of the virtual environment behaviour, an approach inspired by Qualitative Reasoning systems. Besides the redefinition of physical laws, we have developed mechanisms for eliciting causal relations between events, as causality plays an important part in users' perception of virtual worlds. Our pilot installation is a CAVE TM -like system incorporating a state-of-theart computer game engine as visualisation software, which hasbeen ported to this immersive display. The event-based system underlying the game engine is used to bypass the native Physics engine and replace it with our Alternative Reality software. A first prototype has been fully implemented, the Alternative Reality modules totaling over 100,000 lines of C++ code. We present early results obtained with this approach, illustrated with examples taken from two artistic briefs, developed by digital artists associated to this research.
Virtual Reality Artworks provide sophisticated user experiences but their development is a comple... more Virtual Reality Artworks provide sophisticated user experiences but their development is a complex process. We describe the use of Intelligent Virtual Environments for VR Art. In this approach, virtual world behaviour is governed by a symbolic system. This supports news forms of experimentation with physical laws or with causality that we have termed Alternative Reality. In addition, basing world behaviour on a symbolic representation can facilitate collaboration between artists and scientists. We introduce the techniques behind Alternative Reality and illustrate these with examples from the prototype. We conclude by an outline of artistic work in progress using these techniques.
We describe a new approach to the behaviour of 3D environments that supports the definition of ph... more We describe a new approach to the behaviour of 3D environments that supports the definition of physical processes and interactive phenomena. The work takes as a starting point the traditional event-based architecture that underlies most game engines. These systems discretise the environments' Physics by separating the objects' kinematics from the physical processes corresponding to objects interactions. This property has been used to insert a new behavioural layer, which implements AI-based simulation techniques.
2004 IEEE International Conference on Systems, Man and Cybernetics (IEEE Cat. No.04CH37583), 2004
In this paper, we describe such an environment, in which the user can be presented in real-time w... more In this paper, we describe such an environment, in which the user can be presented in real-time with an alternative range of consequences for a given interaction with virtual world objects, thus inducing various perceptions of causality. From a systemic perspective, we can adopt a pragmatic approach, inspired from Humian philosophy, which considers that causal relations are established by the user in response to certain event cooccurrences. To control causal perception in VR, the system comprises the following components: a visualisation engine, an Event Recognition System (together with its specific event formalism that supports event modification), and a causal engine as an Event Modification System, which selects co-occurring events on a rule-based manner. A search process, evaluates alternative consequences using semantic and spatiocontiguity information, such as comparison between candidate objects on which the action consequences should be applied. A first prototype has been fully implemented and is described together with an example real-time simulation.
We describe a new approach to the behaviour of 3D environments that supports the definition of ph... more We describe a new approach to the behaviour of 3D environments that supports the definition of physical processes and interactive phenomena. The work takes as a starting point the traditional event-based architecture that underlies most game engines. These systems discretise the environments' Physics by separating the objects' kinematics from the physical processes corresponding to objects interactions. This property has been used to insert a new behavioural layer, which implements AI-based simulation techniques. We introduce the rationale behind AI-based simulation and the techniques we use for qualitative Physics, as well as a new approach to world behaviour based on the induction of causal impressions. This is illustrated through several examples on a test environment. This approach has implications for the definition of complex world behaviour or non-standard physics, as required in creative applications.
Proceedings of the 12th annual ACM international conference on Multimedia - MULTIMEDIA '04, 2004
We introduce a novel approach to the creation of Virtual Reality Art installations, which support... more We introduce a novel approach to the creation of Virtual Reality Art installations, which supports the design of alternative worlds, in which laws of Physics can be redefined to induce new user experiences. To implement this concept of "Alternative Reality", we have used Artificial Intelligence techniques to support the definition of the virtual environment behaviour, an approach inspired by Qualitative Reasoning systems. Besides the redefinition of physical laws, we have developed mechanisms for eliciting causal relations between events, as causality plays an important part in users' perception of virtual worlds. Our pilot installation is a CAVE TM -like system incorporating a state-of-theart computer game engine as visualisation software, which hasbeen ported to this immersive display. The event-based system underlying the game engine is used to bypass the native Physics engine and replace it with our Alternative Reality software. A first prototype has been fully implemented, the Alternative Reality modules totaling over 100,000 lines of C++ code. We present early results obtained with this approach, illustrated with examples taken from two artistic briefs, developed by digital artists associated to this research.
Virtual Reality Artworks provide sophisticated user experiences but their development is a comple... more Virtual Reality Artworks provide sophisticated user experiences but their development is a complex process. We describe the use of Intelligent Virtual Environments for VR Art. In this approach, virtual world behaviour is governed by a symbolic system. This supports news forms of experimentation with physical laws or with causality that we have termed Alternative Reality. In addition, basing world behaviour on a symbolic representation can facilitate collaboration between artists and scientists. We introduce the techniques behind Alternative Reality and illustrate these with examples from the prototype. We conclude by an outline of artistic work in progress using these techniques.
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Papers by Paolo Libardi