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What is Deva3 and why you should know about it

If you are interested in virtual reality, you might have heard of Deva3, a system that supports large-scale distributed virtual environments. But what exactly is Deva3 and what makes it so special? In this article, we will explain what Deva3 is, how it works, and what are some of its applications. We will also answer some frequently asked questions about Deva3 at the end.

Introduction

Virtual reality (VR) is a technology that creates immersive and interactive simulations of real or imaginary worlds. VR can be used for various purposes, such as entertainment, education, training, communication, and collaboration. However, creating and managing VR experiences can be challenging, especially when they involve large numbers of geographically distributed users and complex scenarios.

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That's where Deva3 comes in. Deva3 is a system that enables the design and development of large-scale distributed virtual environments (VEs). It was created by the Advanced Interfaces Group at the University of Manchester in the UK. Deva3 aims to overcome some of the limitations of existing VR systems by exploiting subjectivity and flexibility in the representation and behaviour of objects in VEs.

What is Deva3?

Deva3 is an acronym for Distributed Environment for Virtual Activities version 3. It is a system that consists of a set of software components that allow the creation and management of large-scale distributed VEs. A VE is a computer-generated representation of a physical or abstract space that can be explored and manipulated by users. A distributed VE is a VE that can be accessed by multiple users from different locations over a network.

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Deva3 is based on the concept of subjectivity, which means that different users can have different views and experiences of the same VE depending on their preferences, roles, tasks, and contexts. For example, two users in a VE might see different objects, colours, sounds, or animations depending on their interests or goals. This allows for more personalised and adaptive VR experiences.

What are the benefits of Deva3?

Deva3 offers several advantages over other VR systems, such as:

• It supports large numbers of users in complex VEs without compromising performance or quality.

• It allows for flexible and dynamic creation and modification of objects and behaviours in VEs.

• It enables user-centric and context-aware VR experiences that can adapt to different situations and needs.

• It facilitates collaboration and communication among users in VEs.

• It provides a platform for developing various applications of VR in different domains.

How Deva3 works

In this section, we will explain how Deva3 works in terms of its architecture, its approach to subjectivity and synchronisation, and its behaviour description language.

The architecture of Deva3

The architecture of Deva3 is based on a client-server model, where each user has a client application that communicates with a server application that manages the VE. The client application is responsible for rendering the VE on the user's display device (such as a monitor or a head-mounted display) and capturing the user's input (such as keyboard, mouse, or joystick). The server application is responsible for storing the state of the VE (such as the position, orientation, shape, colour, sound, and behaviour of objects) and updating it according to the user's actions and events.

The server application consists of three main components: the world manager, the object manager, and the behaviour manager. The world manager maintains a global view of the VE and handles requests from clients to join or leave the VE. The object manager manages the creation, deletion, modification, and distribution of objects in the VE. The behaviour manager manages the execution, modification, and distribution of behaviours in the VE. A behaviour is a set of rules that define how an object reacts to events or interacts with other objects or users.

Subjectivity and synchronisation

One of the key features of Deva3 is its support for subjectivity, which means that different users can have different views and experiences of the same VE. This is achieved by allowing each user to specify a set of filters that determine what objects and behaviours they want to see or hear in the VE. For example, a user might want to filter out objects that are irrelevant to their task, or change the appearance or sound of objects to suit their preferences. The filters are applied by the object manager and the behaviour manager on the server side, and the filtered state of the VE is sent to the client application.

However, subjectivity also poses a challenge for synchronisation, which means that different users should have a consistent view and experience of the same VE. This is especially important for collaboration and communication among users. To address this challenge, Deva3 uses a hybrid approach that combines optimistic and pessimistic synchronisation techniques. Optimistic synchronisation means that the client application predicts the state of the VE based on the user's actions and events, and updates the display accordingly without waiting for confirmation from the server. Pessimistic synchronisation means that the client application waits for confirmation from the server before updating the display. Deva3 uses optimistic synchronisation for local objects and events that are relevant to the user, and pessimistic synchronisation for global objects and events that affect other users.

Behaviour description language

Another key feature of Deva3 is its behaviour description language (BDL), which is a scripting language that allows users to define and modify behaviours in VEs. BDL is based on a rule-based paradigm, where each behaviour consists of a set of rules that specify how an object reacts to events or interacts with other objects or users. For example, a rule might specify that an object changes its colour when it is clicked, or that an object follows another object when it moves.

BDL is designed to be easy to use and expressive, as well as flexible and dynamic. Users can create and edit behaviours using a graphical user interface (GUI) or a text editor, and they can apply behaviours to objects at run-time without restarting the VE. Users can also use BDL to create complex behaviours by combining simple behaviours using operators such as sequence, parallel, choice, loop, or condition.

The applications of Deva3

Deva3 can be used for various applications of VR in different domains, such as:

Collaborative virtual environments

A collaborative virtual environment (CVE) is a VE that supports collaboration and communication among multiple users. Deva3 can be used to create CVEs that allow users to work together on tasks, share information, or socialise in VR. For example, Deva3 has been used to create CVEs for urban planning, museum visits, and online gaming. Deva3 supports various modes of collaboration and communication, such as co-presence, awareness, coordination, negotiation, and feedback. Deva3 also supports various types of devices and interfaces for accessing CVEs, such as desktop computers, laptops, tablets, smartphones, head-mounted displays, projectors, speakers, microphones, cameras, keyboards, mice, joysticks, gloves, trackers, etc.

Virtual reality education and training

Virtual reality education and training (VRET) is a form of education and training that uses VR to provide learners with realistic and interactive learning environments. Deva3 can be used to create VRET applications that allow learners to acquire knowledge and skills in VR. For example, Deva3 has been used to create VRET applications for medical education, fire safety training, and cultural heritage education. Deva3 supports various types of learning activities and outcomes, such as exploration, experimentation, demonstration, simulation, feedback, assessment, and reflection. Deva3 also supports various types of learning styles and preferences, such as visual, auditory, kinesthetic, individual, or collaborative.

Conclusion

In this article, we have introduced Deva3, a system that supports large-scale distributed virtual environments. We have explained what Deva3 is, how it works, and what are some of its applications. We have also highlighted some of the benefits and challenges of Deva3.

Summary of the main points

Here are the main points that we have covered in this article:

• Deva3 is a system that enables the design and development of large-scale distributed virtual environments.

• Deva3 is based on the concept of subjectivity, which means that different users can have different views and experiences of the same virtual environment.

• Deva3 uses a client-server architecture, a hybrid approach to synchronisation, and a behaviour description language to create and manage virtual environments.

• Deva3 can be used for various applications of virtual reality in different domains, such as collaborative virtual environments and virtual reality education and training.

Future directions and challenges

Deva3 is an ongoing research project that aims to improve and extend its features and functionalities. Some of the future directions and challenges for Deva3 are:

• Enhancing the scalability and performance of Deva3 to support larger numbers of users and objects in more complex virtual environments.

• Improving the usability and accessibility of Deva3 to make it easier for users to create and modify virtual environments and behaviours.

• Evaluating the effectiveness and impact of Deva3 on user experience, satisfaction, learning outcomes, and collaboration outcomes.

• Exploring new domains and scenarios for applying Deva3 to address real-world problems and needs.

FAQs

Here are some frequently asked questions about Deva3:

Q: How can I access Deva3?

A: Deva3 is not a commercial product, but a research prototype that is available for academic purposes. You can download Deva3 from its official website: . You will need a Windows PC with a graphics card that supports OpenGL 2.0 or higher to run Deva3.

Q: How can I learn how to use Deva3?

A: Deva3 comes with a user manual that explains how to install, configure, and use Deva3. You can also find some tutorials and examples on the website that demonstrate how to create and modify virtual environments and behaviours using Deva3. You can also contact the developers of Deva3 if you have any questions or feedback.

Q: What are some of the limitations of Deva3?

A: Deva3 is not a perfect system, and it has some limitations that you should be aware of. Some of the limitations are:

• Deva3 does not support 3D sound or haptic feedback.

• Deva3 does not support dynamic lighting or shadows.

• Deva3 does not support physics-based simulation or collision detection.

• Deva3 does not support animation or scripting of objects.

Q: What are some of the alternatives to Deva3?

A: There are many other systems that support distributed virtual environments, such as:

• , an open source platform for creating 3D virtual worlds.

• , a game engine that allows creating 2D and 3D games and applications.

• , another game engine that offers high-quality graphics and physics simulation.

• , a social VR platform that allows users to create and explore user-generated worlds.

Q: What are some of the sources that I can use to learn more about Deva3?

A: Here are some of the sources that you can use to learn more about Deva3:

• The official website of Deva3: .

• The research papers that describe the design and evaluation of Deva3: .

• The YouTube channel that showcases some of the applications and demos of Deva3: .

I hope you enjoyed reading this article and learned something new about Deva3. If you have any comments or questions, please feel free to share them with me. Thank you for your attention and have a great day! 44f88ac181