Section 3 of the BYO3D SIGGRAPH 2010 Course

2. Representation and Display

3. Glasses-bound Stereoscopic Displays

4. Unencumbered Automultiscopic Displays

5. Source Material: Rendering and Capture

6. Emerging Technology

9. Representation and Display

10. Glasses-bound Stereoscopic Displays

11. Overview of Common Glasses Designs

12. BYO Shutter Glasses

13. Unencumbered Automultiscopic Displays

14. Source Material: Rendering and Capture

15. Emerging Technology

17. Color Filters: Anaglyph Anaglyph (usually red/blue) glasses an early type Separate images in wavelength with notch filters Unpleasant color effect

18. Anaglyph Image Example Apollo17: VIP Site Anaglyph Credit: Gene Cernan, Apollo 17, NASA Anaglyph by Erik van Meijgaarden

19. Color Filters: Comb Filters Comb Filters: lots of notch filters across the visible spectrum Solve the unpleasant colored image effect Can be used with normal white screens (unlike polarizing glasses) Note: This graph is for illustration purposes only. Dolby has offered to send us the true attenuation profile. We will update the slides when we receive it.

20. Optical comb filters Note: This graph is for illustration purposes only. Dolby has offered to send us the true attenuation profile. We will update the slides when we receive it. Interference based optical filter

21. Polarizing Glasses Basic configuration Silvered screen Polarized projectors

23. Polarization mapped to volume of a unit sphere

24. Linear states at the equator

25. Circular states at the poles

26. Orthogonal states diametrically oppositehttp://www.hpl.hp.com/hpjournal/95feb/feb95a4b.pdf

27. Circular vs. Linear Polarizers Circular allows viewer to rotate head Real-D currently use circular polarizers Linear polarization: Orientation dependant Circular polarization: Independent of orientation

28. Making a Polarizer A linear polarizer is a set of conductors that “short out” the electric field in one direction A circular polarizer is a linear polarizer followed by a quarter wave plate

29. Active Glasses Use electronically controlled spatial light modulators to modify or produce images of a scene Expensive glasses, cheap (or no) accompanyingdisplay Popular for personal viewing

30. LCD Screen Glasses “Simplest” idea: put screens right in front of the eyeOriginal immersive “VR” headgear Optics to make the screens visible Expensive and obscure other vision

31. LCD Shutter Glasses Single LCD “pixel” in front of each eye Synchronize transparent/opaque state with screen updates to deliver correct image to eye Right Image

32. Types of LCD shutters LCD “Normal” anti-parallel configuration Pi Cell, parallel configuration http://www.liquidcrystaltechnologies.com/tech_support/Pi_Cell.html

34. Representation and Display

35. Glasses-bound Stereoscopic Displays

36. Overview of Common Glasses Designs

37. BYO Shutter Glasses

38. Unencumbered Automultiscopic Displays

39. Source Material: Rendering and Capture

40. Emerging Technology

42. BYO Shutter Glasses: Components Electronics Microcontroller, components for power supply LCD Shutters Liquid Crystal Technologies Frame Acrylic Cardboard

43. Digikey Parts List

44. Parts Totals Mouser Parts List: $4.24 Total Cost Mouser: $4.24 Digikey: $9.36 LCT (next slide): $50 Total: $63.60 + shipping + time

45. LCD Shutters Liquid Crystal Technologies Pi-Cells sales@liquidcrystaltechnologies.com to order sample kit $25 per sample ($50 total)

47. High voltage (~35V) or low voltage (~3V) supply rails

48. Modulated by 1kHz

50. Frames Template Cut out this template (found to scale on website) Will need to print on 11x17 paper Peel back protective coating Cut corrugations out from one side Slide in the shutter

51. Frames Assembly Tape will prevent the hinge from tearing

52. Electronics Schematic

54. Current through inductor generates high voltage when switched

56. Board layout gEDA tools: gschem pcb PCB Version 0.2

57. Creating the board: Milling machine David Carr’s milling machine makeyourbot.org

58. Creating the boar: Toner Transfer Uses a laser printer to protect copper from acid (etching) http://www.riccibitti.com/pcb/pcb.htm

59. Solder parts

60. Program the microcontroller I used an old Picstart Plus programmer wired to the ICSP header

62. MPLAB (Windows or Wine)

63. Pikdev (Linux)

65. Syncing with DVI A horrible hack! Most modern shutter-glasses compatible screens use DVI only at 120Hz Analog method to extract sync pulse from DVI (Digital Video Interface)

66. DVI Sync Extractor Output: “digital” sync pulse Input: one DVI data pin (inter frame porch shown) Simple op-amp comparator followed by a Schmitt Trigger. The bandwidth of the op-amp (TI TLV2462 CP) filters out the high-frequency DVI content.

67. Building DVI Sync Extractor Board fabricated using same method as for shutter glasses Source is provided on course website DVI connectors coupled with ribbon cable Traces would be too small to thread through pins on single sided board Will probably need totweak for your video card

68. DVI Sync Extractor Parts List DiDigikey Parts List: $13.00 May also want DVI cables

69. Putting everything together Choosing the right monitor is important 60Hz monitors with slower crystals/drive circuitry will create too much crosstalk CIMG1565 CIMG1567

70. Putting everything together We use a Viewsonic vx2268wm Not only is refresh rate 120Hz, but LC response time is faster than I can measure with 1000fps camera. CIMG1670 CIMG1671

71. User’s view CIMG1660 CIMG1669