Shamus Smith and David Duke. Virtual environments as hybrid systems. In Eurographics UK 17th Annual Conference (EG-UK'99), Cambridge, UK, 1999.  Home/Search   Document Details and Download   Summary   Related Articles   Check

.... [13] Green and Halliday 1996 [15] Steed and Slater 1996 [32] Behavioral library: Stansfield, Shawver et al. 1995 [30] Interaction Kessler 1999 [19] Lewis, Koved et al. 1991 [21] Gobbetti and Balaguer 1993 [13] Bowman 1999 [7] Jacob, Deligiannidis et al. 1999 [18] Smith and Duke 1999 [28] Interaction techniques: Bowman and Hodges 1997 [6] Liang and Green 1993 [22] Poupyrev, Billinghurst et al. 1996 [25] Stoakley, Conway et al. 1995 [33] Tanriverdi and Jacob 2000 [34] Wloka and Greenfield 1995 [36] interface objects data VR System Dialog control Application Interface ....

S. Smith and D. J. Duke, "Virtual Environments as Hybrid Systems," presented at Annual Conference Eurographics UK Chapter, Cambridge, 1999.

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Shamus Smith and David Duke. Virtual environments as hybrid systems. In Eurographics UK 17th Annual Conference (EG-UK'99), Cambridge, UK, 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 ....

....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 environment has been designed using Flownets, it is necessary to prototype the design. Despite the careful process of describing the requirements, and de signing the environment to meet the requirements, it is likely ....

Shamus Smith and David Duke. Virtual environments as hybrid systems. In Eurographics UK 17th Annual Conference, pages 113-128. Eurographics, 1999.

....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 and David Duke. Virtual environments as hybrid systems. In Eurographics UK 17th Annual Conference, pages 113--128. Eurographics, 1999.

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Shamus Smith and David Duke. Virtual environments as hybrid systems. In Submitted to EG-UK 1999, 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 ....

....are interaction techniques for navigation and manipulation of objects in an immersive virtual environment, as opposed to through the window (desktop) environments. Preliminary work on the specification of a number of interaction techniques based on two handed interaction have been described in [23]. In this paper we study the specification of a navigation technique based on a through the window environment. The navigation technique is used to move a virtual camera through a virtual, three dimensional (3D) space. An informal description of the mouse based navigation technique is given in ....

S. Smith and D. Duke. Virtual environments as hybrid systems. In Proceedings of the Eurographics UK 17th Annual Conference, EG-UK'99, pages 113--128. Eurographics UK Chapter, 1999. Cambridge, UK.

....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 and D. Duke. Virtual environments as hybrid systems. In Proceedings of the Eurographics UK 17th Annual Conference, EG-UK'99, pages 113--128. Eurographics UK Chapter, 1999. Cambridge, UK.

....which are not clearly represented on the models. Firstly, the continuous nature of the inputs to the interaction. Typical input devices in virtual environments (for example 3D mice and data gloves) provide a continuous stream of position and orientation information. It has been noted elsewhere [25, 26] that virtual environments can be considered to comprise of a mix of continuous and discrete processes. The ability to model both discrete and continuous components is an important part of VE description. Secondly, time is not easily represented in the CSP models. For interactions based on hand ....

.... view is zoomed in (as the rectangle is out of the user s field of view) These observations have led the current research to investigate the use of hybrid system modelling techniques to provide a platform for describing the continuous and discrete nature of interaction within virtual environments [1, 26]. As a bridge from the CSP described in this paper, we have investigated the application of hybrid CSP [27] to provide mechanisms to allow the conversion of continuous variables to discrete variables over a communication channel, the modelling of time out events and the use boolean expressions ....

S. Smith and D. Duke. Virtual Environments as Hybrid Systems. In Proceedings of Eurographics UK 17th Annual Conference (EG-UK'99), Cambridge, UK, pp. 113-128. Eurographics UK Chapter, 1999.

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Shamus Smith and David Duke. Virtual environments as hybrid systems. In Submitted to EG-UK 1999, 1999.

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