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

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

eric_wiebe@ncsu.edubethany_smith@ncsu.edu

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