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Virtual RealityVirtual Reality
What is Virtual What is Virtual Reality?Reality?• A responsive virtual world in which the user is
effectively immersed• Features
o Immersiveo Interactiveo Real timeo Viewer centered
Crucial TechnologiesCrucial Technologies• Display system• Graphics rendering system• Tracking system• Virtual world construction and maintenance
system
Display SystemDisplay System• Display technology advances very rapidly• VR display system must provide immersion• Desktop displays are not considered to be VR
o Hardly block out the real worldo Do not present virtual world objects in life sizeo Do not create the illusion of immersion
CAVECAVE• Cave Automatic Virtual Environment• An immersive virtual reality environment
where projectors are directed to 3, 4, 5 or 6 of the walls of a room-sized cube
Head-Mounted Head-Mounted DisplayDisplay• Worn on the head or as part of a helmet• A small display optic in front of one or each
eye
Panoramic DisplayPanoramic Display• Use multiply displays to provide wide view
angle• Widely used in many applications• Challenge: geometry and color calibration
Tracking SystemTracking System• Tracking observer’s body coordinate / head
motion• Challenges:
o Accuracyo Ergonomicso System latency
Augmented RealityAugmented Reality• Direct or indirect view of a physical real-world
environment whose elements are augmented by virtual computer-generated sensory input
• Enhance person’s perception of reality
Application: Application: WikitudeWikitude• The very first Augmented Reality Browser for
smartphone-users• Scan surrounding using camera and device’s
sensors• Objects’ information is displayed in the cam
right where the real object is located
Mixed RealityMixed Reality• Merge of real and virtual worlds to produce
new environments and visualizations • Physical and digital objects co-exist and
interact in real time
Application: Application: Virtual Virtual therapytherapy• Psychologist treats soldiers with PTSD (Post
Traumatic Stress Disorder)• PTSD: can not get over from bad things
happened to him/her• Best way to treat PTSD: exposure therapy
o Go back to the bad thingo Go through it gentlyo Talk about what they were feeling
