5 ms·

Holography Without Lasers: Hand-Drawn Holograms (1995)

83 points by networked 11y ago

DanBC 11y ago
See also some discussion here: https://news.ycombinator.com/item?id=9052375 https://news.ycombinator.com/item?id=9052375 From this source: http://www.amasci.com/amateur/holo1.html http://www.amasci.com/amateur/holo1.html
- eru 11y ago
  There's also https://news.ycombinator.com/item?id=3428898 https://news.ycombinator.com/item?id=3428898, but it never got any traction.
fao_ 11y ago
Ah! I was directed to this by a friend many years back, and added it to the list of projects that "I'll do one day" -- but then presently forgot about it. Thank you for reminding me!
- wbeaty 11y ago
  Too late! HP just announced a 3D semi-holographic display based on just this same optics. With theirs, each tiny reflective groove has several conventional LCD pixels in front, plus bright RGB edge-lighting. http://www.technologyreview.com/news/512716/new-3-d-display-could-let-phones-and-tablets-produce-holograms/ http://www.technologyreview.com/news/512716/new-3-d-display-...
colanderman 11y ago
Since the reflected points emanate from the (curved) scratches themselves, I would think that between the left and right eyes, each point would be slightly vertically misaligned (since each eye would see light from a different vertical point in each scratch, beside a different horizontal point). I suppose you could eliminate this by drawing the scratches as if they were cross-sections of a Fresnel lens: i.e., at several points during the scratch, reposition the compass fulcrum vertically so that the needle remains at approximately the same vertical location.
- wbeaty 11y ago
  See 3.4 in the paper, http://amasci.com/amateur/hand1.html#34 http://amasci.com/amateur/hand1.html#34 also figure 11b. Yes, a proper "abrasion hologram" would have holo-pixels resembling little fresnel-lens cross-sections. The "hand drawn" version is simplified, and produces weird artifacts unless viewed perpendicular, and the reproduced image isn't too wide. Yet even so, we can create a 3D object in less than an hour via simple hand-scribed circles on soft plastic. Use an architect compass and an old CD case. It's now appearing on vinyl, on Jack White Lazaretto album, also on recent re-release of classic 1976 "Rush 2112"... https://www.youtube.com/watch?v=H9gRPtkSOn0 https://www.youtube.com/watch?v=H9gRPtkSOn0 https://www.youtube.com/watch?v=jqNF9IWmFQE https://www.youtube.com/watch?v=jqNF9IWmFQE Find lots at https://www.youtube.com/playlist?list=PL60100E8F3572CEB1 https://www.youtube.com/playlist?list=PL60100E8F3572CEB1

83 points by networked 11y ago

DanBC 11y ago

See also some discussion here: https://news.ycombinator.com/item?id=9052375 https://news.ycombinator.com/item?id=9052375 From this source: http://www.amasci.com/amateur/holo1.html http://www.amasci.com/amateur/holo1.html

eru 11y ago
There's also https://news.ycombinator.com/item?id=3428898 https://news.ycombinator.com/item?id=3428898, but it never got any traction.

fao_ 11y ago

Ah! I was directed to this by a friend many years back, and added it to the list of projects that "I'll do one day" -- but then presently forgot about it. Thank you for reminding me!

wbeaty 11y ago
Too late! HP just announced a 3D semi-holographic display based on just this same optics. With theirs, each tiny reflective groove has several conventional LCD pixels in front, plus bright RGB edge-lighting. http://www.technologyreview.com/news/512716/new-3-d-display-could-let-phones-and-tablets-produce-holograms/ http://www.technologyreview.com/news/512716/new-3-d-display-...

colanderman 11y ago

Since the reflected points emanate from the (curved) scratches themselves, I would think that between the left and right eyes, each point would be slightly vertically misaligned (since each eye would see light from a different vertical point in each scratch, beside a different horizontal point). I suppose you could eliminate this by drawing the scratches as if they were cross-sections of a Fresnel lens: i.e., at several points during the scratch, reposition the compass fulcrum vertically so that the needle remains at approximately the same vertical location.

wbeaty 11y ago
See 3.4 in the paper, http://amasci.com/amateur/hand1.html#34 http://amasci.com/amateur/hand1.html#34 also figure 11b. Yes, a proper "abrasion hologram" would have holo-pixels resembling little fresnel-lens cross-sections. The "hand drawn" version is simplified, and produces weird artifacts unless viewed perpendicular, and the reproduced image isn't too wide. Yet even so, we can create a 3D object in less than an hour via simple hand-scribed circles on soft plastic. Use an architect compass and an old CD case. It's now appearing on vinyl, on Jack White Lazaretto album, also on recent re-release of classic 1976 "Rush 2112"... https://www.youtube.com/watch?v=H9gRPtkSOn0 https://www.youtube.com/watch?v=H9gRPtkSOn0 https://www.youtube.com/watch?v=jqNF9IWmFQE https://www.youtube.com/watch?v=jqNF9IWmFQE Find lots at https://www.youtube.com/playlist?list=PL60100E8F3572CEB1 https://www.youtube.com/playlist?list=PL60100E8F3572CEB1