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Rendering participating media is important for a number of domains, ranging from commercial applications (entertainment, virtual reality) to simulation systems (driving, flying and space simulators) and safety analyses (driving conditions , sign visibility). This article surveys global illumination algorithms for environments including participating media.(More)
This paper presents a physically based simulation of atmospheric phenomena. It takes into account the physics of non-homogeneous media in which the index of refraction varies continuously, creating curved light paths. As opposed to previous research on this area, we solve the physically based differential equation that describes the trajectory of light. We(More)
In the last few years, the use of ontologies has spread thanks to the irruption of the Semantic Web. They have become a crucial tool in information systems as they explicitly state the meaning of information, making it possible to share it and to achieve higher levels of interoperability. However, being knowledge representation models as they are, other(More)
Dealing with synthetic actors who move and behave realistically in virtual environments is a task which involves di!erent disciplines like Mechanics, Physics, Robotics, Arti"cial Intelligence, Arti"cial Life, Biology, Cognitive Sciences and so on. In this paper we use the nature of the information required for controlling actors' motion and behaviour to(More)
In this article, we derive a physically-based model for simulating rainbows. Previous techniques for simulating rainbows have used either geometric optics (ray tracing) or Lorenz-Mie theory. Lorenz-Mie theory is by far the most accurate technique as it takes into account optical effects such as dispersion, polarization, interference, and diffraction. These(More)
This paper presents a powerful animation engine for developing applications with embodied animated agents called Maxine. The engine, based on open source tools, allows management of scenes and virtual characters, and pays special attention to multimodal and emotional interaction with the user. Virtual actors are endowed with facial expressions, lip-synch,(More)
This paper describes a novel extension of the photon mapping algorithm, capable of handling both volume multiple inelastic scattering and curved light paths simultaneously. The extension is based on the Full Radiative Transfer Equation (FRTE) and Fermat's law, and yields physically accurate, high-dynamic data than can be used for image generation or for(More)
New ways of interaction are arising from the Ambient Intelligence areas. Multimodal interaction with virtual characters is changing the way we communicate and interact with applications and other users. This paper describes an animation engine developed with open source tools and based in the use of scripts that allows the management of scenes and the work(More)