1. Passive Stereo Projection in the Classroom
Lessons learned putting a system together
Eric Wiebe
Bethany Smith

2. Motivation
Addressing the need for sensorially rich instructional experiences
Leveraging perceptual processes to enhance learning
Meeting the infrastructure realities of the classroom

3. How does the system work?
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?

4. Types of Stereo Projection
Two-image systems
Optics to separate right/left eye reception
Free fusion
One screen/two images
Active shutters
One image
Color anaglyphs
Polarized anaglyphs

5. Polarized 3-D Stereo

6. System Components Screen 2 projectors Polarizing Filters and glasses
Computer
Dual output graphics card

7. Screen Rear projection Front projection Vendor: Tierney Brothers
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
Vendor: B & H
Cost: $300

8. Screen Frame & Cart 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
Vendor: Bertelkamp
Screen: $900
Cart: $600

9. Projectors 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
State Contract
Connectivity module added $500
Vendor: CDW
Projector: $4500/pair
Stacker: $500

10. Polarizing Filters & Glasses
Linear
Cheaper
Variety of styles
Theme Park
Satisfactory
Orientation issues
Circular
More expensive
One style
Aviator
Vendor: Berezin
Filters: $25/pair
Glasses: $45 for 30 pairs
Vendor: Berezin
Filters: $230/pair
Glasses: $200 for 10 pairs
Berezin just came out with theme park style circular polarizing glasses at $10 a piece.

11. Computer Windows or Linux machine Video Card nVidea Quadro4 750 XGL
Open GL Stereo features
Two monitor out
Issues determining the selection of the stereo features
Vendor: Dell
Cost: $2000
Vendor: Page Computer
Cost: $350

12. 3-D Printer 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

13. Virtual 3-D Model

14. Physical 3-D Model

15. Software Applications
Pokescope
Basic stereo pair application
VRCAD viewer
For viewing AutoCad files
OpenGL Based Software

16. Current Applications vPython Engineering Graphics Earth Science
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

17. Examples

18. Current Research
Logistical and practical use of system in the classroom
Efficacy of system for enhancing understanding
Individual differences
Concept/representation interaction
Task/representation interaction

19. Future 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

20. http://ced.ncsu.edu/vise eric_wiebe@ncsu.edu bethany_smith@ncsu.edu
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