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Fig. 1.11
Integration of 3D graphics with X3D layers
computer environments. In addition, the X3D objects can be dynamically modified
through a variety of available mechanisms [
26
]. The semantics of X3D describes
an abstract functional behavior of time-based interactive 3D and multimedia
information. As shown in Fig.
1.7
, each X3D application can:
• establish implicitly a world coordinate space for defined objects, as well as the
objects included by the application;
• define and compose explicitly a set of 2D, 3D, and multimedia objects;
• specify hyperlinks to other files and applications;
• model objects behaviors;
• connect to external modules or applications via programming and scripting
languages.
With combining the domain-specific and X3D-based ontologies we can create
different 3D models for engineering purposes, see Fig.
1.11
. The engineering
models are interrelated using the ontologies shared semantics, which enables the
developments of a flexible environment infrastructure to facilitate the semantics
adaptation to multidisciplinary scenarios, as presented by CFD and FEM layers.
The semantic ''model'' is a concise representation of concepts that allow
investigations of its properties, and in addition it enables an unambiguous repre-
sentation of different domains viewpoints. A model has to clearly convey what it is
about and defining the concept being depicted, in order that the stakeholders can
unambiguously identify their viewpoints. However, for the model to be applicable,
modelers should avoid to create fully comprehensive models defining a complete
set of attributes. The value of a model resides in its ability to focus on the concern
at hand, and to reduce complexity by eliminating the nontangible elements. The
hiding of pointless and redundant data is the key of making an efficient ontology.
Thus, we find Semantic Web an appropriate vehicle to obtain the knowledge about
objects, by presenting and using only the parts of that available knowledge, which
suits our demand.
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