computer supported collaborative work computer supported collaborative work 22nd april 2003 cib w78...
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![Page 1: Computer Supported Collaborative Work Computer Supported Collaborative Work 22nd April 2003 CIB W78 Workshop 20th International Conference Information Technology for Construction Stephen](https://reader035.vdocuments.net/reader035/viewer/2022071606/6142a840b7accd31ec0ed740/html5/thumbnails/1.jpg)
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Computer Supported Collaborative Work22nd April 2003
CIB W78 Workshop20th International Conference
Information Technology for Construction
Stephen Egan [email protected]
CSIRO Manufacturing & Infrastructure Technology
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Computer Supported Collaborative Work is a general term that covers a number of threads that will need to converge if humans are to gain the maximum benefit
from the use of IT in solving complex problems.
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Multiple Points of Presence
• Teleconferencing• Conference Calls• Email• Fax• Snail mail
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Shared Domain Information
• Web / Electronic documents• CAD Models• Whiteboard• Drawings• Paper documents• Reference material
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Multiple Consistent Domain Views
• Electronic Document Managers• Watermarking• Central Document Store• Change Manager
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Schedule
• Teleconferencing• Shared Workspaces
– Co located– Remote collaboration
• On-site Collaboration• Immersive Environments• Discussions
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How can existing and emerging Information and Communication Technologies be leveraged and
integrated to facilitate collaborative work in the AEC/FM sector?
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Teleconferencing
• Video and audio conferencing in common use• Technical limitations
– Image and sound quality– Audio and video track synchronisation– Network lag
• Inter personnel limitations– Eye contact, gestures– Limited presence
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Teleconferencing
• Next generation provides better technical experience– Larger bandwidth, Internet2– More immersive displays– Head tracking for facial expressions, eye contact– Larger capture area– Physical document sharing
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Agora
Paper Mediated
Video Conferencing
• University of Tsukuba
• King's College London
• Saitama University
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Co-located Collaboration
• Majority of of collaborative interactions take place in the same physical space
• New technologies can be used to aid collaboration – Easier sharing of documents between individuals– Easier sharing on a group level– Ad-hoc networking of participants’ equipment– New techniques for multiple users working on same
documents
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Co-located Collaboration
• Smart rooms allow computer control of a room and its facilities
• Ad hoc networking can allow heterogenous pieces of equipment to communicate automatically
• Shared screens, printers etc.• Services offered in “Publish and Subscribe”
model.
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iRoom
• Stanford University• Large wall
mounted SMART boards– Touch panel – Wireless mouse &
keyboard• Table top display• Integrates laptop,
PDAs, etc• iwork.stanford.edu
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Intelligent Whitespaces
• Tracking, capture and projection• Allows users to collaborate in a brainstorming
session, remotely or locally.• Add interactivity to whiteboard items• “Hands on” interaction with system.
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MagicBoard
Augmented Whiteboard
• CLIPS-IMAG, France
• MIT Media Lab
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Enhanced Desk
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CAVE
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CAVE Automatic Virtual Environment
• Also known as VR Theatre Display and Spatially Immersive Display (SID)
• Developed by Electronic Visualization Laboratory, University of Illinois at Chicago
• First Demonstrated at SIGGRAPH 1992• Now produced commercially by Fakespace
Systems• http://www.fakespacesystems.com/products/cave.htm
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CAVE
• Immersive Virtual Environment created by three rear projected images on walls and one front projected image on floor.
• Stereoscopic view using shutter glasses.
• Six DOF head tracking system adjusts perspective.
• “Wand” used for user input.• Multiple users.
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CAVE
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On-site collaboration
• Mobile technologies for use on site– Wireless devices such as PDAs and Smart phones– GSM, GPRS, Wireless Java, etc– 3G phones offer greater potential
• Parts and materials tracking• Calibrated photography• Surveying
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On-site collaboration
• More information can be collected in the field –less data entry/transfer in office.
• Technological restrictions has kept current solutions basic
• 3G will provide “always on” high bandwidth services, newer devices and technologies will allow more to be done in the field
• Huge potential for growth
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Starmate
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Immersive Environments
• Virtual Reality and Augmented Reality• Computer generated models of new and existing
structures• Virtual Reality has a long history of use,
particularly for manufacturing and mechanical industries
• Underused in AEC/FM?
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Augmented Reality
• Superimposes a Virtual Reality model, text, 2D graphics, etc., over a user’s view of the real world
• Numerous potential applications for AEC/FM sector
• Location aware technologies through GPS
• Indoor and outdoor use
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AR Displays
• Hand held• Head Mounted Displays (HMD)• Optical see-through
– Half silvered mirror mixes graphic display and reality
• Video see-through– Images from camera combined with graphics and shown on
display
• Retinal Laser scan (MicroVision)– Graphical images scanned onto retina with low power laser.
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AR Optical tracking
• Symbols and shapes printed on markers are tracked optically
• Image threshold lowered so symbol may be identified
• Affined projection used to place AR image over marker
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AR User Interaction
• Handheld PDA• Optically Tracked gloves• Optically Tracked paddles• “Magic Wand”• Three dimensional mouse• Hand/Finger tracking• Haptic Feedback
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AR Location Awareness
• GPS• Optical
Markers• Fixed IR-LED
beacons• Fixed radio
beacons
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Architectural Anatomy
Real-time Structural
Feature Overlay• Columbia University
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Real World Mapping
• Existing Condition Documentation• Site Feature Mapping• Real Time 3D Capture
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Existing Condition Documentation
• Reluctance to use new forms of modelling due to existing buildings, structures and features documented in older formats.
• Drawings may be incomplete, out of date, or non-existent!
• Remodelling is slow, costly and error prone.• Detail can be omitted.
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Existing Condition Documentation
• Create 3D model of existing structures using scanning laser camera.
• Fast, accurate and cheap.
• www.quantapoint.com
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Scanning Laser Camera
• Precision Laser Camera used to create very high definition models
• Data collection takes place by laser scanning structure.
• Point clouds created from different perspectives.• Point clouds merged to produce model.
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Scanning Laser Camera
• 125, 000 laser pulses per second
• 10 Million points can be scanned in 80 seconds.
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Scanning Laser Camera
• Model created by merging point clouds.
• Common points on X, Y and Z axes are precisely registered.
• Point cloud can be sliced for plan, elevation or section views.
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Site Feature Mapping
• Collect data from an existing site to add to a Virtual Environment.
• Place existing models in correct position and orientation.
• Create models in Virtual Environment from existing features.
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Tinmith
Interactive Augmented
Reality Techniques
for 3D Geometry
Construction at a Distance
• University of South Australia
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Avatars in Immersive Environment
• Avatars are used to represent other entities in an immersive environment.
• Avatar may represent another user of the system, or may represent a synthetic entity.
• Easy to implement.• Unrealistic representation.
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Avatars in Immersive Environment
• Computer generated body double
• Little scope for gestures, facial expressions or body language.
• Does not necessarily resemble user’s real appearance.
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Avatars in Immersive Environment
• Tracking and orientation is simplified
• Low rendering overhead.
• Support for primitive gestures.
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Real Time 3D Capture
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Real Time 3D Capture
• 3D Live system captures a 3D model of a user in real-time.
• Model may be used as a realistic avatar in an immersive environment.
• May be used for teleconferencing, virtual tours, etc.
• www.zaxel.com
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Real Time 3D Capture
• Multiple cameras used to capture user.• Virtual viewpoint created on demand.
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Real Time 3D Capture
• System uses at least three cameras.• One PC workstation used for every three
cameras.• Proprietary software used to create Virtual
Viewpoints.
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Real Time 3D Capture
• Realistic representation of user• Gestures, facial expressions and body language
are captured• Mini studio required for capture• Not ideal for two way use
– No eye contact due to HMD.
• More suited to virtual tours, presentations, etc.
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3-D Live
Real-time Interaction for Mixed Reality
• National University of Singapore
• Zaxel Systems• University of
Washington• Hiroshima State
University
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For Discussion…
• Tele conferencing– How useful will new technologies be?
• Will a more “real” presence be beneficial?• Are existing solutions adequate?
• Shared workspaces– What kind of work will leverage new
advances?
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For Discussion…
• On-site collaboration– What kind of work can benefit from smaller, faster and
cheaper mobile devices?– What new work methods can be developed from the
new generation of wireless devices?
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For Discussion…
• Immersive environments– Moving away from WIMP
• How can a user interact more intuitively within an immersive environment?
– New worlds, new opportunities• Adding value with immersive environments
• Other topics…