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Access to and Encoding of VRML State Information

Author(s): Martin Mauve.
Title: Access to and Encoding of VRML State Information
Published: Technical Report TR-98-013, Department for Mathematics and Computer Science, University of Mannheim, 1998
Keyword(s): VRML, Binary Encoding, Persistence
Abstract: In this paper we propose a concept for transparent access to VRML stateinformation. Our approach enhances VRML browsers to provide additionalfunctionality instead of placing the burden for state access on content developers. Theenhanced functionality is realized as an extension to the External Authoring Interface(EAI). Any application which relies on a VRML browser as the 3D presentationengine can use the new EAI functionality to get and set the state of arbitrary VRMLcontent. In order to support diverse applications, the proposed methods allow not onlyretrieval of the full state of a complete world, but also of the state of single objects andstate changes. Since the results of state access should be independent of browserimplementations, we also specify an encoding for state information. Data in this formare either produced or consumed during state access. For the encoding of stateinformation we use an efficient, easy-to-parse binary encoding.
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