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3D Tiled Display Walls

Jürgen P. Schulze, Ph.D.University of California San Diego

IEEE eScience Tiled Display Workshop, Dec 7, 2010

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UCSD Founded 1960 Jacobs School of

Engineering ranks 9th internationally, according to the 2009 Academic Rankings of World Universities by Subject Field conducted by Shanghai Jiao Tong University in China

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UC San Diego

California Institute for Telecommunications and Information Technology (Calit2)

New Laboratory Facilities Nanotech, Chips, Radio, Photonics, Grid, Data,

Applications Virtual Reality, Digital Cinema, HDTV, Synthesis

Over 1000 Researchers in Two Buildings Linked via Dedicated Optical Networks International Conferences and Testbeds

UC Irvine

Mission: Preparing for an world in which distance has been eliminated

Bio M.Sc. from University of Massachusetts, Dartmouth (1998) Ph.D. from University of Stuttgart, Germany (2003) Post-Doc at Brown University, Providence (2003-2005) UCSD/Calit2 (since 2005)

Assistant Research Scientist at Calit2 Lecturer in Department of Computer Science Working with Dr. Tom DeFanti

Research Interests: Computer graphics Scientific visualization Parallel graphics 3D human-computer interaction Digital cinema

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Immersive Visualization Lab (IVL)

3 staff programmers 2 PhD students ~5-10 undergraduate students Research focus on virtual reality (VR) applications

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Overview Display Walls

Traditional: HiPerSpace StarCAVE

Next Generation: Varrier REVE NexCAVE

Discussion

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Calit2’s 287 Megapixel HiPerSpace Tiled Display (70 30" displays)

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StarCAVE

15 panels + floor 34 HD projectors, 1920x1080 pixels 4-camera optical tracking 18 Linux PCs with Nvidia Quadro 5600 10 Gbit/s network

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Autostereoscopic Technology Light sent separately to each eye from a monitor No 3D glasses required Tracked (dynamic) vs. non-tracked (static, sweet

spot) Approaches:

Lenticular screen Barrier masked screen

Barrier maskLenticular screen

The Varrier Wall

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12 x 5 array of autostereoscopic displays

16 Linux PCs with dual Nvidia GeForce 7900 graphics cards

1600 x 1200 pixels per display

2 camera ART tracking system

Similar system at UIC/EVL

Rapidly Expandable Virtual Environment (REVE)

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2x3 Alioscopy 24” display wall 3 rendering PCs 6 camera NaturalPoint OptiTrack tracking system

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REVE Wall at KAUST 6x3 array of Alioscopy 42” displays

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Pixel Focus on Each Display The off-axis focus of individual lenticules (left)

causes all sub-pixels of each channel to converge to a common area on the plane of focus (right).

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View Alignment on Tiled Wall The tiling of lenticular displays is achieved by

shifting the primary lobes of all displays (left) into alignment at the plane of focus (right)

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User’s View The repeating channel array, with solid colors

projected onto a user and a white card at the plane of focus

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Viewing Positions

Four users in different basic positions in front of a display at the plane of focus: A) Normal viewing B) Between channels C) On the repeat boundary D) Normal viewing on the repeat

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Autostereo With Tracking

The four experimental tracking cases. The head shows the position of the actively-tracked user 0) Untracked: traditional viewing mode 1) Perspective tracking: perspective is updated

based on head-tracking, but no change is made to the direction in which channels are projected; exaggerated perspective

2) Channel tracking: channels move with viewer position; perspective snap back on updates

3) Channel reassignment

NexCAVE at Calit2 10 42” JVC Xpol displays Standard LCD panels with

polarizing filter on top 1920x1080 pixels per screen 5 rendering PCs: Dell XPS 710 Nvidia GeForce 480 graphics 2 camera ART TrackPack system

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NexCAVE at KAUST

• NexCAVE at KAUST: 21 JVC Xpol displays• OptiTrack tracking system• Meyer sound system19

Source: NHK Media Technology, Inc.

Tiled Micropolarized (Xpol) 3D JVC Panels

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NexCAVE Rendering Draw left eye image as usual Create and enable stencil buffer with even

scan lines transparent Draw right eye image Done: swap buffers

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NexCAVEPros: Bright image High contrast: 300:1 (vs. 30:1 in StarCAVE) Head-tracked user is always in sweet spotCons: 3D glasses required JVC displays have wide bezels, especially at

bottom Overlapping helps reduce impact of bezels In 3D, negative effect of staggered displays is

less pronounced because both eyes rarely look at a bezel at the same time

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Autostereo WallsPros: No 3D glasses required Bright displays (lenticular technology) 8 Views allow “looking around”Cons: Viewer has to be in sweet spot Very limited depth range (+/- 2 foot) Moire patterns Reduced usable resolution (compared to native res.) Hard to display text Reduced image quality in mono mode

More Information Publications:

T.A. DeFanti, D. Acevedo, R.A. Ainsworth, M.D. Brown, S. Cutchin, G. Dawe, K.-U. Doerr, A. Johnson, C. Knox, R. Kooima, F. Kuester, J. Leigh, L. Long, P. Otto, V. Petrovic, K. Ponto, A. Prudhomme, R. Rao, L. Renambot, D.J. Sandin, J.P. Schulze, L. Smarr, M. Srinivasan, P. Weber, G. Wickham: “The Future of the CAVE”, Central European Journal of Engineering, 1(1), 2011, ISSN 1896-1541

R. Kooima, A. Prudhomme, J. Schulze, D. Sandin, T. DeFanti: “A Multi-Viewer Tiled Autostereoscopic Virtual Reality Display”, To appear in the Proceedings of the 17th ACM Symposium on Virtual Reality, Software and Technology, Hong Kong, China, Nov 22-24, 2010

Contact: http://www.calit2.net/~jschulze/ http://ivl.calit2.net/wiki/ E-mail: jschulze@ucsd.edu

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