Download Distributed Virtual Worlds: Foundations and Implementation by Dr. Stephan Diehl (auth.) PDF

By Dr. Stephan Diehl (auth.)

Recently with the good fortune of Java and the life of alternative interfaces among VRML and Java, it turned attainable to enforce three-d web purposes on average VRML browsers (PlugIns) utilizing Java. With the frequent use of VRML browsers, e.g., as a part of the Netscape and web Explorer regular distributions, every body attached to the net can without delay input a digital global with no fitting a brand new type of software program. The VRML expertise bargains the foundation for brand spanking new kinds of customer support akin to interactive three-d product configuration, spare half ordering, or patron education. additionally, this expertise can be utilized for CSCW in intranets.
The reader can be accustomed to programming languages and pcs and, specifically, may still understand Java or at the least an object-oriented programming language. The e-book not just offers and explains resource code, that are used as a place to begin for personal implementations, however it additionally describes the elemental difficulties and the way at the moment recognized suggestions paintings. It discusses numerous diversified thoughts and alternate offs. Many illustrations aid the reader to appreciate and memorize the underlying principles.

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Additional info for Distributed Virtual Worlds: Foundations and Implementation Techniques Using VRML, Java, and CORBA

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Updates of these parts have to be sent only to members of the associated groups. In the second approach the consistency requirements are relaxed. The temporal consistency can be weakened for data, for which the sequence of updates must not be the same at all clients. e. 6 Protocols for Distributed Virtual Worlds 57 be perceived by the user at the dient. For example consider an avatar which opens a door and then walks through the opening. If these actions happen in the wrong order at another dient, the avatar would walk through a dosed door.

7 Conclusion 49 events. In our example this could be done in the callback method as follows: if ((EventOutSFVec3f)obj)==translation) . 4 Problems with the EAI The EAI was developed as a compromise and thus provides only limited functionalityo One design rule was that it should not allow more access to the scene graph than was provided with Script nodes and events before. This was felt to be necessary, so that the browser vendors would not have to sacrifice optimizations of the scene graph and so that it was easy to add the EAI to existing browserso To the best of my knowledge, no browser so far does any optimizations of the scene grapho An essential shortcoming of the EAI is that it provides no methods to get the type of a node or a list of its fieldso For this reason, it is impossible to implement a generic traversal of the scene graph, eogo, to search all occurrences of a certain node type in the grapho 5.

So far we have only mentioned that there are different kinds of field which are declared with the keywords field, eventin, eventOut or exposedField. The field keyword indicates that the value of the field is provided when the node is instantiated and the value cannot be changed afterwards. n says that the value ofthe field is received as an event via routes from other nodes. In turn, the keyword eventDut means that the value of this field can be sent via routes to other nodes. If there are several routes, from other nodes to an eventin, this is called fan-in.

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