Driven by the recent resurgence of 3D cinema, depth cameras and stereoscopic displays are becoming commonplace in the consumer market. Introduced last October, Microsoft Kinect has already fostered gesture-based interaction for applications well beyond the intended Xbox 360 platform. Similarly, consumer electronics manufacturers have begun selling stereoscopic displays and inexpensive stereoscopic cameras. Most commercial 3D displays continue to require cumbersome eyewear, but inexpensive, glasses-free 3D displays are imminent with the release of the Nintendo 3DS. At SIGGRAPH 2010, the Build Your Own 3D Display course demonstrated how to construct both LCD shutter glasses and glasses-free lenticular screens, providing Matlab-based code for batch encoding of 3D imagery. This follow-up course focuses more narrowly on glasses-free displays, describing in greater detail the practical aspects of real-time, OpenGL-based encoding for such multi-view, spatially multiplexed displays. The course reviews historical and perceptual aspects, emphasizing the goal of achieving disparity, motion parallax, accommodation, and convergence cues without glasses. It summarizes state-of-the-art methods and areas of active research. And it provides a step-by-step tutorial on how to construct a lenticular display. The course concludes with an extended question-and-answer session, during which prototype hardware is available for inspection.

2. Construction Glasses-free 3D Displays

3. Multi-view Rendering using OpenGL

4. Multi-view Interlacing using GLSL

5. Designing Content for Glasses-free 3D Displays

6. Emerging Technology

8. Lenticular Model Viewer: Application Overview Lenticular Model Viewer main.h OpenGL Include Files Main Application main.cpp glinclude.h config.txt OpenGL Function Library help.txt glf.h /models/*.obj /images/numbers/*.tga glf.cpp GLM OBJ Model Library glinfo.h glm.h glinfo.cpp glm.cpp lenticular.h OpenGL State Information Library lenticular.cpp interlacer.vert Lenticular Interlacer Library Interlacer.frag mosaic.frag mosaic.vert

13. GL_TEXTURE_2D texture bound to GL_COLOR_ATTACHMENT0

15. GL_TEXTURE_2D_ARRAY_EXT texture array with layers bound to GL_COLOR_ATTACHMENT0

16. Fragment shader accesses each view using a single sampler2DArrayvariable:uniform sampler2DArray views;

17. Lenticular Model Viewer: Examining the GLUT Display Callback main.cpp

18. Lenticular Model Viewer: Lenticular Interlacer Library Data Structures lenticular.h Screen Parameters

19. Lenticular Model Viewer: Lenticular Interlacer Library Data Structures lenticular.h o Screen Parameters Lenticular Parameters wl f wp

20. Lenticular Model Viewer: Lenticular Interlacer Library Data Structures lenticular.h far clipping plane Screen Parameters display display near clipping plane Lenticular Parameters Camera Parameters views

21. Lenticular Model Viewer: Lenticular Interlacer Library Data Structures lenticular.h Screen Parameters Lenticular Interlacer Lenticular Parameters Camera Parameters

22. Lenticular Model Viewer: Lenticular Interlacer Library Functions lenticular.h

23. Lenticular Model Viewer: setViewMultiscopicLenticular()

24. Lenticular Model Viewer: displayLenticular() displayInterlacedLenticular() displayViewMosaicLenticular()

25. Lenticular Model Viewer: GLSL Shaders for Lenticular Interlacing o wl View 1 View 2 View 3 f × × × d wp Mask 1 Mask 2 Mask 3 + Interlaced

26. Lenticular Model Viewer: Interactive Calibration Mode “Moiré Magnifier” Calibration Pattern “Numbers” Calibration Pattern

28. Can obtain screen pitch from manufacturer specifications

29. Lenticular parameters (besides focal length) estimated interactively

31. Antialiasing requires quality> 0 (i.e., oversampled views)

33. See related AutostereoInterleaverby Robert Kooima (also OpenGL/GLSL) (see http://csc.lsu.edu/~kooima/interleaver/interleaver.html) http://cameraculture.media.mit.edu/byo3d

35. Construction Glasses-free 3D Displays

36. Multi-view Rendering using OpenGL

37. Multi-view Interlacing using GLSL

38. Designing Content for Glasses-free 3D Displays

39. Emerging Technology

40. Q & A and Demonstrations