Passive Stereo Projection in the Classroom Eric Wiebe Bethany Smith Lessons learned putting a system together
Jan 15, 2016
Passive Stereo Projection in the Classroom
Eric WiebeBethany Smith
Lessons learned putting a system together
• Addressing the need for sensorially rich instructional experiences
• Leveraging perceptual processes to enhance learning
• Meeting the infrastructure realities of the classroom
Motivation
• Stereopsis - binocular depth cue• The right and left eye (65mm apart)
record slightly different projections of the same 3-D scene
• The brain uses these discrepancies to recreate the 3-D nature of the scene - the sensation of depth
• How do you send two different projections to the two eyes from a flat screen?
How does the system work?
• Two-image systems– Optics to separate right/left eye
reception– Free fusion
• One screen/two images– Active shutters
• One image– Color anaglyphs – Polarized anaglyphs
Types of Stereo Projection
Polarized 3-D Stereo
• Screen• 2 projectors• Polarizing Filters
and glasses• Computer
– Dual output graphics card
System Components
• Rear projection– Disney Black Snapper
Screen• 72” x 96”
– More room needed– Users can be close to
the screen without blocking the projection
– Very Delicate
• Front projection– DaLite Silver Screen– Less room needed -
viewers take up the same space as the projection throw
– Durable
Vendor: Tierney Brothers
Cost: $1800
Screen
Vendor: B & H
Cost: $300
• Custom made from 80/20 modular structural aluminum
• Specification issues– Determining true size of screen– Determining number, type and
spacing of snaps
• Construction issues• Portable, but sturdy
Screen Frame & Cart
Vendor: Bertelkamp
Screen: $900
Cart: $600
• inFocus LP530 DLP Projector• 2000 Lumens
– Filters cut down light output– High Lumens needed
• Heat Circulation Issues• Enhanced connectivity module
– Monitor attachment and remote control
• Projector stacker– Mobile
Projectors
Vendor: CDW
Projector: $4500/pair
Stacker: $500
• Circular– More expensive– One style
• Aviator
• Linear– Cheaper– Variety of styles
• Theme Park
– Satisfactory– Orientation issues
Polarizing Filters & Glasses
Vendor: Berezin
Filters: $25/pair
Glasses: $45 for 30 pairs
Vendor: Berezin
Filters: $230/pair
Glasses: $200 for 10 pairs
• Windows or Linux machine
• Video Card– nVidea Quadro4 750 XGL
• Open GL Stereo features • Two monitor out
Computer
Vendor: Dell
Cost: $2000
Vendor: Page Computer
Cost: $350
• Creates a physical 3-D model of a virtual 3-D model
• IGES and STL export from popular 3-D modelers
• Binder/powder and fused deposition most common low-cost techniques
• Expands the sensorial experience into the haptic realm
3-D Printer
Virtual 3-D Model
Physical 3-D Model
• Pokescope– Basic stereo pair application
• VRCAD viewer– For viewing AutoCad files
• OpenGL Based Software
Software Applications
• vPython– Graphics library extension to Python– Used in physics education for simulation
• Engineering Graphics– Engineered object representation– Bringing together virtual and physical models
• Earth Science– Targeting middle/high school earth science– Enhancing understanding of surface and sub-
surface features
Current Applications
Examples
• Logistical and practical use of system in the classroom
• Efficacy of system for enhancing understanding– Individual differences– Concept/representation interaction– Task/representation interaction
Current Research
• Combining current eye-tracking research with 3-D system– Does binocular cueing
influence perceived feature salience?
• Using eye-tracking to control display of 3-D content
Future Research
http://ced.ncsu.edu/vise
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