Post on 26-Dec-2015
transcript
Welcome toCGMB574 Virtual Reality
Computer Graphics and Multimedia Department
Textbook: Burdea and Coiffet, Virtual Reality Technology, 2nd Edition, Wiley, 2003
Textbook web site: www.vrtechnology.org
Textbook web site: www.vrtechnology.org
IntroductionIntroduction
Let’s describe in term of functionality•It’s a simulation•Not static - interactive•Real-time - User become captivated
Interactivity + captivating power = immersion
VR push further – all human sensorial channel
What is VR….?
What is Virtual Reality?
“A high-end user-computer interface that involves real-time simulation and interaction through multiple sensorial channels.” (vision, sound, touch, smell, taste)”
Introduction
“a medium composed of interactive computer simulations that sense the participant’s position and actions and replace or augment the feedback to one or more senses, giving the feeling of being mentally immersed or present in the simulation (a virtual world)”
What is Virtual Reality? (cont)
Related Terms
Artificial Reality (coined by Myron Krueger, 1991)an artifical reality perceives a participant’s action in
terms of the body’s relationship to a graphic world and generated responses that maintain the illusion that his or her actions are taking place within that world
Virtual Environment1. a virtual world. 2. an instance of a virtual world
presented in an interactive medium such as virtual reality
Related Terms
Cyberspace (coined by William Gibson, 1984a location that exists only in the minds of the
participants, often as a result of technology that enables geographically distant people to interactively communicate
Augmented Realitya type of virtual reality in which synthetic stimuli are
registered with and superimposed on real-world objects; often used to make information otherwise imperceptible to human senses perceptible
Related Terms
Telepresence the ability to directly interact (often via computer
mediation) with a physically real, remote environment from the first-person point of view; there are no restrictions on the location of the remote environment, and there are no restrictions on the size of the device used to carry out the user’s commands at the remote location
Introduction
VR is an integrated trio of “Immersion”, “Interaction”
and “Imagination”
Virtual RealityReality
Simulator / Reality Engine
Effectors
Computers that processing the simulation/environment•Generate and draw or render highly detailed images of virtual environment•Blending 3D sound effect•Calculate any touch related, or tactile, effects present in the virtual environment•Rapidly change how the environment looks•Behave in the response to the user’s action•It have to be powerful to create even simple virtual environment
• Tracker – that monitor the user movement• Virtual visualization– that let the user see what is
happening• 3D sound– that let the user hear what is
happening• Touching /Manipulation devices– that let user
feel the objects and manipulate it in virtual environment
IntroductionVR equation
Sensorama Simulator, US Patent #3,050,870, 1962
Introduction
NASA VIEW system (1989)
Introduction
NASA VIEW system (1992)
Introduction
Components of Virtual Environment (VE)
Immersion– Feeling of being inside and part of the virtual world
– Type of immersion Mental immersion – state of being deeply engaged, suspension of disbelief Physical immersion – synthetic stimulus of the body’s senses via the use of technology this does not
imply all senses or the entire body is immerged/engulfed
Interaction– The ability to interact in VE
– Need to have virtual body (i.e. virtual hand to simulate the touching and manipulating the virtual object)
Tactile feedback– The ability to touch and feel virtual object
Acoustic feedback– Adding sound in VE
– This feedback complement the interactive and tactile domain
Type of VR system
Immersive
– Computer generated images will replace the real world view
– The generated images will react to the position and orientation of the user’s head
Non-Immersive
– Users are able to view the virtual world however, they are still aware of the real world
– i.e. viewing the VE through a monitor Hybrid
– Permits the user to view the real world with virtual images superimposed over this view
– Also known as augmented reality
Augmented Reality (AR)
It is a technology related to VR that uses many of the same tools of VR
It differs from VR, in that AR enhances rather than replaces, one’s view of the physical world
A typical AR system features transparent optics that reflect computer-generated images into the user’s eye
This create an images appear to overlay real objects in front of the user
It is a potential benefits to physicians, engineers, and other professionals
Augmented Reality (AR)
Augmented Reality should consists of
– Combines real and virtual.
– Is interactive in real-time.
– Is registered in 3D. Relies on accurate 3D graphics
– I.e. Fighter pilot View outside world simultaneously with everything that
should appear in real world Targets, boundaries and landmarks are clearly shown
– I.e. Medicine Using virtual environment to simulate operation process
• Altering virtual office building• Detecting design flaws with VR• Escape disaster with VR design• Getting a feel for microscopic worlds• Exploring other planets via VR• VR and scientific visualization• Creating better construction equipment with VR• Medical training with VR• Physical therapy in Virtual World• Fighting phobias in a safe environment• Changing store layout via VR• Shopping for a house with VR• High-tech training in Virtual Environment• VR and entertainment and gaming• Military training with VR
Application of VR
The key elements of a VR System