Smith, S., Duke, D., and Massink, M. The Hybrid World of Virtual Environments. Computer Graphics Forum 18, 3, September 1999, 287-307.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....to select part of the scene. The database window can display the database content, or the scene file decomposition via inlines structure, the data model. Furthermore we add a tool to create the LOD database complement which will be described at the end of this section. As is explained in [9], every description of the interaction techniques has different drawbacks. An informal approach of the description makes more inconsistent the model, and S. Smith and al show that there is no obvious way to describe it. If an environment is not full comprehensible, it makes difficulties to ....

S. Smith, D. Duke, M. Massink"The Hybrid World of Virtual Environments",

....and continuous behaviour, the movement of a selector within the environment. This hybrid behaviour makes the traditional techniques for describing direct manipulation interfaces unsuitable. A number of new graphical formalisms have been developed which (more accurately) describe hybrid behaviour [9, 12, 16]. To exemplify the ability of hybrid formalisms to specify virtual environment behaviour, the two handed flying interaction technique is illustrated in figure 2 using a hybrid modelling technique [16] The two handed flying technique, detailed in [14] enables flying through a virtual environment ....

.... graphical formalisms have been developed which (more accurately) describe hybrid behaviour [9, 12, 16] To exemplify the ability of hybrid formalisms to specify virtual environment behaviour, the two handed flying interaction technique is illustrated in figure 2 using a hybrid modelling technique [16]. The two handed flying technique, detailed in [14] enables flying through a virtual environment in a direction determined by the vector between the user s two hands and at a speed relative to their hand separation. Movement can be halted as the user brings hands together. In this formalism the ....

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Shamus Smith, David Duke, and Mieke Massink. The hybrid world of virtual environments. In Eurographics '99, 1999.

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Shamus Smith, David Duke, and Mieke Massink. The hybrid world of virtual environments. Computer graphics forum, 18(3):C--297--C--307, 1999.

....to relate to the requirements. For example, the code for the requirement of opening a window would relate to the transformation of a mathematical 3D coordinate system. An alternative approach is to design the behaviour also using requirements oriented abstractions. The Flownets formalism [9, 10] was designed for this purpose and subscribes to the philosophy that virtual environment behaviour should be modelled as a hybrid of continuous and discrete components [4, 10, 20] Flownets support the description of both user behaviour (interaction techniques) and that of the world objects ....

....An alternative approach is to design the behaviour also using requirements oriented abstractions. The Flownets formalism [9, 10] was designed for this purpose and subscribes to the philosophy that virtual environment behaviour should be modelled as a hybrid of continuous and discrete components [4, 10, 20]. Flownets support the description of both user behaviour (interaction techniques) and that of the world objects visually. We refrain from describing the formalism here, detailed descriptions can be found in [9, 10] Once objects have been designed using a 3D modeller and the behaviour of the ....

[Article contains additional citation context not shown here]

Shamus Smith, David Duke, and Mieke Massink. The hybrid world of virtual environments. Computer Graphics Forum, 18(3):C297-C307, 1999.

....such as flight deck systems and medical monitoring systems. Additionally, many emerging technologies, such as virtual reality and haptic input devices, support richer and more continuous interaction with the user, and hence applications using such techniques can also be viewed as hybrid systems [18]. If the models we build of such systems are to support reasoning about issues of usability and user requirements, then building a model of system behaviour is not enough we must also have some means of referring to both the user and the environment. It has been proposed that usability issues ....

S. Smith, D. Duke, and M. Massink. The hybrid world of virtual environments. In Proceedings of Eurographics 99 (To appear), 1999. 19

....MASSINK AND FACONTI such as flight deck systems and medical monitoring systems. Additionally, many emerging technologies, such as augmented reality, support richer and more continuous interaction with the user, and hence applications using such techniques can also be viewed as hybrid systems [21]. If the models we build of such systems are to support reasoning about issues of usability and user requirements, then building a model of system behaviour is not enough we must also have some means of referring to both the user and the environment. It has been proposed that usability issues ....

S. Smith, D. Duke, and M. Massink, "The hybrid world of virtual environments," in P. Brunet and R. Scopigno (Eds.), Computer Graphics Forum, Vol. 18, No. 3, pp. 297--307, 1999.

....results in the transition from the state of door opening to door open. Consequently it is necessary to consider this continuous detail. The general opinion is that virtual environments are hybrid systems and the behaviour should be modelled as a combination of discrete and continuous components [3, 7, 15]. Flownets [6, 7] are descriptions developed specifically for virtual environments. The discrete components of the interaction are described using traditional place transition Petri nets [4] and the continuous components are described using constructs based on systems dynamics literature [1] The ....

....from the state of door opening to door open. Consequently it is necessary to consider this continuous detail. The general opinion is that virtual environments are hybrid systems and the behaviour should be modelled as a combination of discrete and continuous components [3, 7, 15] Flownets [6, 7] are descriptions developed specifically for virtual environments. The discrete components of the interaction are described using traditional place transition Petri nets [4] and the continuous components are described using constructs based on systems dynamics literature [1] The continuous ....

Shamus Smith, David Duke, and Mieke Massink. The hybrid world of virtual environments. Computer Graphics Forum, 18(3):C297--C307, 1999.

....supported by an interaction toolkit. However, the very nature of virtual environments contributes to the difficulty of describing and modelling interaction. Many VE interaction techniques share the fact that they consist of both continuous components and discrete components of interaction [23, 24]. For example, we may want to explore the virtual world projected around us by means of turning our head. To obtain this, the movement of our head should be rendered continuously in order to produce a realistic presentation of the scene we are looking at. At the same time we may want to select an ....

S. Smith, D. Duke, and M. Massink. The hybrid world of virtual environments. In Accepted for publication at Eurographics '99, 1999. Milan, Italy.

....developed, for example [3, 11, 12] These provide a toolkit layer to insulate the VE application designer from the low end VE implementation issues. A number of models that represent user interaction at an abstract level have been developed specifically for VE interfaces. These are described in [10, 16, 15], which show how these models can then be subsequently specified to increasingly detailed descriptions, thus moving the design closer to implementation. At an abstract level, the interaction models can be refined towards the interface supported by a given toolkit. However, the specification of ....

S. Smith, D. Duke, and M. Massink. The hybrid world of virtual environments. In Accepted for publication at Eurographics '99, 1999. Milan, Italy.

No context found.

Smith, S., Duke, D., and Massink, M. The Hybrid World of Virtual Environments. Computer Graphics Forum 18, 3, September 1999, 287-307.

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