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Show HN: LitiHolo – a desktop 3D hologram printer that makes true holograms

litiholo.com

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Re: Show HN: LitiHolo – a desktop 3D hologram printer that makes true holograms

#31

Post by hologram-paul »

filmor wrote: post #25
camjohnson26 wrote: post #16

Maybe this is the wrong definition but I read “true hologram” to mean a 3D image made of light, this looks more like one of those images that used to be on the cover of Guinness World Records. Edit: I see OP is the founder and this is a smaller project. Looks really cool and sorry if that sounded negative! Just not what I expected from the title.

"3d image made of light" is decidedly not what a real hologram is. Have a look at the Wikipedia page, real holograms are so much cooler!

I could not have said it better. Real holograms also still have a lot of development yet to come and improvements that can be made, whereas many other 3D techniques out there are limited quite significantly, or are quite old and don't have the head room to improve much.

Re: Show HN: LitiHolo – a desktop 3D hologram printer that makes true holograms

#32

Post by hologram-paul »

vorpalhex wrote: post #27
camjohnson26 wrote: post #16

Maybe this is the wrong definition but I read “true hologram” to mean a 3D image made of light, this looks more like one of those images that used to be on the cover of Guinness World Records. Edit: I see OP is the founder and this is a smaller project. Looks really cool and sorry if that sounded negative! Just not what I expected from the title.

I believe you are thinking about a light field display if you want the Star Wars esque living 3d projections of light.

I guess holograms could be considered a sub-set of light field displays, but not all light field displays are holograms.

Re: Show HN: LitiHolo – a desktop 3D hologram printer that makes true holograms

#33

Post by hologram-paul »

Grustaf wrote: post #24
hologram-paul wrote: post #12

Earlier quoted context omitted.

I have often used the comparison to early personal computers. The things were mainly switched and lights, but there was potential for where it could go. I heard that even early Apple people would say "A computer in every household", and people would ask, "What would I do with a computer?" and their best answer was "It's a great way to store and file your recipes."

I love holograms, always found it extremely fascinating, but this is not really an argument. Anything _could_ sort of become the next personal computer, the question is why you think specifically holograms are useful?

I feel like anywhere you see a flat 2D image could be a 3D hologram eventually. And holograms give the "whole message", so more information, better information, clearer information. That's the potential. So portraits, some day hologram cameras, CAD output, advertising, and yes eventually hologram television/displays.

But we are starting with something more simple, and not trying to promise everything to everyone. That does mean looking for initial use cases that will take off early.

Re: Show HN: LitiHolo – a desktop 3D hologram printer that makes true holograms

#34

Post by hologram-paul »

BeniBoy wrote: post #30

What I think is missing from the demo is that we can only see "lateral" movement, which is the reason why many people here think this looks like a lenticular display. If that is a real hologram you should be able to change your viewpoint vertically as well right ? Super cool anyway !

Yes, we currently have full-parallax as a stretch goal, so it is definitely in the works and one of the things that lets holograms go beyond just lenticular. Thanks!

Re: Show HN: LitiHolo – a desktop 3D hologram printer that makes true holograms

#35

Post by phkahler »

captainmuon wrote: post #21

Pretty neat. This seems like it actually exposes holograms the "hard" way, like you would do in a traditional setup (with lasers and beam splitters). A shortcut would be too directly print the very fine pattern that is on the holographic plate - basically a fourier transform of the image you want to encode. When I was in university we did a student's project on computer generated holograms and tried that - with a spe…

I've been wondering if you could compute the interference pattern and then compute the view from any specific angle - possibly on a GPU. A sort of 2d way to save a 3d model.

Also wondering how feasible it is to "reproject" a hologram from one plane to another - rendering multiple "objects" into one hologram/interference pattern.

Re: Show HN: LitiHolo – a desktop 3D hologram printer that makes true holograms

#36

Post by hologram-paul »

phkahler wrote: post #35
captainmuon wrote: post #21

Pretty neat. This seems like it actually exposes holograms the "hard" way, like you would do in a traditional setup (with lasers and beam splitters). A shortcut would be too directly print the very fine pattern that is on the holographic plate - basically a fourier transform of the image you want to encode. When I was in university we did a student's project on computer generated holograms and tried that - with a spe…

I've been wondering if you could compute the interference pattern and then compute the view from any specific angle - possibly on a GPU. A sort of 2d way to save a 3d model. Also wondering how feasible it is to "reproject" a hologram from one plane to another - rendering multiple "objects" into one hologram/interference pattern.

This is definitely possible and is the basis for some computational holography.

And a holographic interference pattern is definitely a way to store a 3D image in a 2D plane, and I think a part of what won the Nobel prize in physics when holography was invented.

Re: Show HN: LitiHolo – a desktop 3D hologram printer that makes true holograms

#37

Post by hologram-paul »

hologram-paul wrote: post #36
phkahler wrote: post #35

Earlier quoted context omitted.

I've been wondering if you could compute the interference pattern and then compute the view from any specific angle - possibly on a GPU. A sort of 2d way to save a 3d model. Also wondering how feasible it is to "reproject" a hologram from one plane to another - rendering multiple "objects" into one hologram/interference pattern.

This is definitely possible and is the basis for some computational holography. And a holographic interference pattern is definitely a way to store a 3D image in a 2D plane, and I think a part of what won the Nobel prize in physics when holography was invented.

And also the subject of the ideas like the holographic universe.

Re: Show HN: LitiHolo – a desktop 3D hologram printer that makes true holograms

#38

Post by nightowl_games »

Cool product.

Offtopic: They say "MIT Media Lab" and for me it just triggers thoughts of Epstein and Aaron Schwartz. It's become a stain in the collective unconscious, much in a similar vein to many people's negative viewpoint of law enforcement. The lesson of our times is this: police your in-group before society does, because society will come down far harder.

Re: Show HN: LitiHolo – a desktop 3D hologram printer that makes true holograms

#39

Post by bluesign »

BeniBoy wrote: post #30

What I think is missing from the demo is that we can only see "lateral" movement, which is the reason why many people here think this looks like a lenticular display. If that is a real hologram you should be able to change your viewpoint vertically as well right ? Super cool anyway !

I was curious on that too, but from animation there seems to vertical effect, just horizontal

Re: Show HN: LitiHolo – a desktop 3D hologram printer that makes true holograms

#40

Post by hologram-paul »

nightowl_games wrote: post #38

Cool product. Offtopic: They say "MIT Media Lab" and for me it just triggers thoughts of Epstein and Aaron Schwartz. It's become a stain in the collective unconscious, much in a similar vein to many people's negative viewpoint of law enforcement. The lesson of our times is this: police your in-group before society does, because society will come down far harder.

I was there before any of that and was working under Steve Benton, who was kind of a demi-God in holography (inventor of the rainbow hologram on credit cards today). It was a special place because of the kind of work we were doing, and I hope that memory survives.
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