Interactive 3D Multimedia Content

The VR-PR Approach (Secure User-Contributed 3D Virtual Environments)

Overview of VR-PR Creative virtual environments permit inclusion of content that is dynamically generated by users. Consequently, in such virtual environments, the structure of the content evolves. Content created by users has its behavior and is interactive, i.e., objects can interact one with another. Therefore, a question arises: how to build an access control model […]

SSM Method (Secure User-Contributed 3D Virtual Environments)

Idea of KBOB The SSM method enables modeling of privileges for virtual environment behavioral content with respect to the semantics of the behaviors. In the pure VR-PR approach, only a global call graph is directly created from the source code of the virtual environment objects. The analysis is based on comparison of local call graphs. […]

SSM4VM Prototype System (Secure User-Contributed 3D Virtual Environments)

A prototype system SSM4VM (Selective Semantic Modeling for Virtual Museums) has been developed with two main assumptions. First, the system contains a large number of interactive objects that can be dynamically added, removed or modified. Second, it is massively accessed by users who play different roles, among others— the role of visitors of virtual museums. […]

SSM Usage (Secure User-Contributed 3D Virtual Environments)

Since the SSM method not only protects geometrical objects, but also enables controlling the use of behavioral content, it widens the variety of applications of virtual environments. By the use of the SSM method, virtual environments in which interactions are security-critical, or in which interactions have to be controlled because they are protected by intellectual […]

Metadata for Interactions of 3D Objects (Describing Interactivity of 3D Content)

Abstract Effective search for interactive 3D objects needed for new applications requires object metadata that cover not only object geometry and semantics, but also behavior. Existing metadata standards define different information describing an object. The missing metadata fragment, not included in existing metadata standards, is metadata of object behavior. Such information should be stored in […]

Multimedia Interaction Model (Describing Interactivity of 3D Content)

Metadata description of object interactions is a set of separate descriptions of all possible object interactions. A single interaction of an object is described according to the Multimedia Interaction Model (MIM). The MIM is an abstract model of a structure of an interaction that occurs between an object that triggers an interaction (trigger object) and […]

Interaction Interfaces (Describing Interactivity of 3D Content)

The Interaction Interface (II) concept is used to describe the API of an object in terms of functions and attributes related to object interactions. Both elements of the API are represented by object parameter types of the Interactive Interface and are accompanied by semantic descriptions. Interaction interfaces are used in metadata as object interaction characteristic […]

XML Schema of Interaction Metadata (Describing Interactivity of 3D Content)

Interactions Schema Interactions schema defines a structure of a final metadata document. The structure of the final document is composed of references to required Interaction Interfaces and a list of interaction descriptions (Fig. 8.1). The root element of interactions metadata is called Interactions. The Interactions element has an optional objectURI attribute that identifies the object […]

Interaction Metadata Example (Describing Interactivity of 3D Content)

To illustrate application of the Multimedia Interaction Model and the Interaction Interface concept consider a 3D virtual world that mimics the real world. Real people have their avatars, can roam the World freely and meet avatars of other people. It is possible to buy land, build houses, and open shops. Shops can sell different virtual […]

Approaches to Search (Searching Content Related by Semantics, Space and Time) (Interactive 3D Multimedia Content)

Abstract In many practical search applications, information resources that are processed are described by their semantic, spatial, and temporal relations to other resources. Sometimes their meaning is different, depending on the place and time or even the resources change in time and place. Existing search methods are insufficient for such data because they do not […]

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