SUPPORTING THREE-DIMENSIONAL MEDIA OBJECT CONTROL AND PRESENTATION IN NCL / SUPORTE AO CONTROLE E À APRESENTAÇÃO DE OBJETOS DE MÍDIA TRIDIMENSIONAIS EM NCL
AUTOR(ES)
ROBERTO GERSON DE ALBUQUERQUE AZEVEDO
DATA DE PUBLICAÇÃO
2010
RESUMO
The world where we live in is physically formed by a three-dimensional space and it is natural human being wants to represent it as faithful as possible. In Web for example there are a lot of efforts in order to support the creation of interactive 3D applications, most of them based on scene graphs and route graphs. Scene graphs have become a standard for modeling spatial 3D applications from a hierarchical and declarative approach. In order to represent the scene graphs behavior, route graphs or imperative languages are more commonly used. As regards Interactive Digital Television (iDTV), on the other hand, there is still a lot of work to be done. Nested Context Language (NCL) is the standard declarative language for Terrestrial Digital Television Systems (ISDB-T) and IPTV (ITU-T), which allows the hypermedia document authoring through a simple and expressiveness approach. Even though NCL does not restrict any type of media object, in its current version (3.0), NCL treats only two-dimensional objects, relating them temporally and spatially. Given the importance of NCL in the iDTV scenario, this research aims discuss how it can also control three-dimensional objects. As a special case, this work discusses how NCL can control composite object behavior represented by scene graphs, discussing its advantages and disadvantages. In order to test what was proposed, an X3D (which is an ISO standard language based on scene graphs) player was incorporated to the Ginga-NCL reference implementation, which is responsible to play NCL applications. Additionally, it is also proposed a new set of NCL events, in order to reflect three-dimensional events, and the incorporation of NCL regions based on three-dimensional geometric, so that the presentation of two-dimensional media objects over 3D object¿s surfaces is possible.
ASSUNTO(S)
ginga-ncl ginga-ncl televisao digital digital television
