[HN Gopher] Specular Holography: How (2010)
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Specular Holography: How (2010)
Author : matthberg
Score : 49 points
Date : 2023-07-09 03:49 UTC (19 hours ago)
(HTM) web link (zintaglio.com)
(TXT) w3m dump (zintaglio.com)
| selimthegrim wrote:
| Is this not akin to
| https://www.researchgate.net/publication/231068500_Oriental_...
| (if the mirror wasn't covered by a polished front?)
| skcgake3 wrote:
| A page from 1995 about this topic.
| http://amasci.com/amateur/holo1.html
| carapace wrote:
| Cheers! That's got to be one of the best pages on the internet.
| jacomyma wrote:
| Steve Mould's video gives an accessible explanation and good
| sense of what these objects feel like:
| https://www.youtube.com/watch?v=sv-38lwV6vc
| Modified3019 wrote:
| After seeing the "lumographic lens" video
| (https://www.youtube.com/watch?v=oiDqUkmozlM) I managed to dig up
| some interesting research on what is basically a method of
| milling a "lens" to project an image at an arbitrary focal point
| using light convergence for "white" and divergence for "dark.
|
| https://cdfg.mit.edu/publications/fabricating-microgeometry-...
|
| https://cdfg.mit.edu/publications/goal-based-caustics
|
| https://cs.dartmouth.edu/~wjarosz/publications/papas11goal.m...
|
| https://cdfg.mit.edu/publications/ in general has a considerable
| amount of interesting publications regarding computational design
| and fabrication of neat optical effects.
|
| As does
| https://web.archive.org/web/20140623052716/http://lgg.epfl.c...
|
| >Caustics are captivating light patterns created by materials
| bundling or diverting light by refraction or reflection. We know
| caustics as random side effects, appearing, for example, at the
| bottom of a swimming pool. In this work we show that it is
| possible to control caustic patterns to form almost any desired
| shape by optimizing the geometry of the reflective or refractive
| surface generating the caustic. We demonstrate how this
| surprising result offers a new perspective on light control and
| the use of caustics as an inspiring design element. Several
| produced prototypes illustrate that physical realizations of such
| optimized geometry are feasible.
|
| Now redirects to https://www.epfl.ch/labs/gcm/publications/
| _Microft wrote:
| This is light on details if I haven't missed a link to another
| page or something.
|
| Definitely browse the links to the images in the ,,See:" section
| of the submitted page though - the images and videos on the knots
| and nature pages are beautiful!
|
| Maybe there are useful references in the Wikipedia article:
|
| https://en.m.wikipedia.org/wiki/Specular_holography
|
| Edit: maybe this, even though the page is awful to use on mobile:
| http://amasci.com/amateur/holohint.html
| agumonkey wrote:
| early dent-oriented shaders
| Nition wrote:
| When I was a kid in the 90s my parents took me to some sort of
| art gallery hidden upstairs above other shops, that was doing a
| hologram exhibition (wavefront holograms, not specular ones like
| in this article). It was dark inside and they had a whole lot of
| amazing large format holograms of various things lit up.
|
| I kind of wonder why holograms of all types aren't more popular.
| It's still amazing to see a 3D image on a 2D plane that you can
| look at from different angles.
| sbierwagen wrote:
| I spent ten minutes the other day trying to buy _any_ laser
| hologram, and as far as I can tell the market just does not
| exist at all outside of "call us" pricing for science museums
| and such. Also doesn't help that the word "hologram" has been
| watered down to uselessness by competing technologies.
| Nition wrote:
| Yep exactly, that's my experience as well. And I think the
| other reply saying it's possible to find them on eBay is kind
| of missing the point. Anywhere you can buy them is kind of
| obscure or unofficial.
|
| I don't understand why something so cool, that keeps working
| forever, is so relatively rare.
|
| I think the only other one I've seen in the wild since that
| exhibition in the 90s that wasn't some tiny thing, was a Lord
| Of The Rings one that Weta Workshop had given to a lecturer
| of mine.
| deanputney wrote:
| Ten minutes! Wow.
|
| Did you check eBay? There are definitely examples for sale
| there. Holography-specific groups have hints on where to buy
| some too. The popular ones are hard to find, but you can make
| them yourself at home or find less sophisticated pieces for
| sale occasionally.
| EvanAnderson wrote:
| This wasn't in Chicago, perchance, was it? There was a lovely
| museum of holography there that I was lucky enough to visit in
| the early 2000's before it closed. Your description reminds me
| of that.
| Nition wrote:
| No, but that sounds like a place I would have enjoyed.
| speps wrote:
| Applied Science has some amazing explanation and application of
| these principles on tempered chocolate:
| https://youtu.be/UsDnkrDvkBo
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