Autonomous virtual humans in virtual worlds

Daniel Thalmann
Int. Acad. Publishers, 1993
Article de conférence

Summary form only given. This paper discusses the problem of control and autonomy of synthetic actors. It first describes an animation approach where synthetic vision is used for navigation by a synthetic actor. The vision is the only channel of information between the actor and its environment and offers a universal approach to pass the necessary information from the environment to an actor in the problems of path searching, obstacle avoidance, and internal knowledge representation with learning and forgetting characteristics. Then it presents the development of a general concept of autonomous actors reacting to their environment and taking decisions based on perception systems, memory and reasoning

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Daniel Thalmann
Int. Acad. Publishers, 1993
Article de conférence

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https://infoscience.epfl.ch/record/98784?ln=fr

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Object manipulation and grasping for virtual humans

Tolga Abaci

Virtual environments need virtual humans that are capable of interacting with objects around them. Existing virtual environments have not found satisfactory general solutions for this problem. The common method is to combine pre-designed (or motion captured) virtual human animation with simple object animation. While the quality of animation produced for object manipulation by such techniques is usually acceptable, adaptability to changes in the virtual environment is very low, if not non-existent. There is also usually no provision for increased variety in interaction scenarios, meaning that a virtual human manipulates an object always exactly in the same way. The answer may lie in higher-level descriptions of object manipulation. This thesis explores different options available to construct and exploit such descriptions. A primary contribution of this thesis is a manipulation framework that brings together a methodology for defining semantic information and several algorithms for virtual human animation to enable describing manipulation sequences in a procedural manner. Within this framework, we also address how virtual object grasping, an action that is central to object manipulation, can be accomplished. Moving towards an even more high-level specification, we also look at how motion planning techniques can be employed to simply specify start and end configurations and have a manipulation sequence generated from these. Several case studies are provided to illustrate the capabilities and potential of the proposed approaches.

EPFL2006

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