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Passive Stereo Projection in the Classroom

Passive Stereo Projection in the Classroom. Lessons learned putting a system together. Eric Wiebe Bethany Smith. Motivation. Addressing the need for sensorially rich instructional experiences Leveraging perceptual processes to enhance learning

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Passive Stereo Projection in the Classroom

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  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. 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?

  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. 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 Screen 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 Vendor: CDW Projector: $4500/pair Stacker: $500

  10. 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

  11. Computer • Windows or Linux machine • Video Card • nVidea Quadro4 750 XGL • Open GL Stereo features • Two monitor out 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 • 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/viseeric_wiebe@ncsu.edubethany_smith@ncsu.eduhttp://ced.ncsu.edu/viseeric_wiebe@ncsu.edubethany_smith@ncsu.edu Visit our website or email us for more information

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