Passive Stereo Projection in the Classroom Eric Wiebe Bethany 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

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