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Comment by jlebar | Hacker News Reader

My mind was also blown when I got to demo this a few years ago.

You sit down and you forget that there's technology happening. The person is there, in front of you. I don't know how else to describe it.

The testimonials in the video aren't exaggerating compared to my experience.

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Do you know if it supports multiple people on "screen" at once? Or does it rely on eye tracking of a single person (plus projection of some sort?) to be able to achieve the 3D effect?

I don't know anything more than what's been released, but from my understanding, light field display don't rely on eye tracking, and you can have multiple people looking from different angles (although the range may be limited to near the center). In the video itself, the camera filming the interaction is moving independently of the person sitting, and unless it was faked, it was able to see its own perspective.

It seems like it does, given in the demo video there's a lady and a baby in the same shot.

We don't know if the baby is seeing the full 3d effect, but my understanding of how light-field displays work is that it isn't based on eye-tracking.

I suspect this worked because the person was, indeed, there.

I mean, not in the same room, but down the hall or so.

You can have the most perfect rendering in the world and 100ms of latency will be enough to make the experience miserable.

Depends on how much bandwidth it needs. I've been video conferencing a lot (who didn't, this past year) and even with people on the other side of the globe I don't recall latency ever being a problem.

Also depends what you're doing. Singing together is impossible over standard video conferencing, for example.

yeah, like if your playing keys live for example, you want your audio interface to have around 6ms latency max (the delay time between your finger pressing a key and you hearing the sound from pressing that key) above that and it starts to become detrimental to your playing. above 10 and you can barely play.

You could imagine commercial/institutional sites hundreds to thousands of miles apart with <10ms latency on dedicated fiber.

Wouldn’t that be way faster than the speed of light?

Depends how many thousands ;) light travels about 3000km in 10ms

https://www.google.com/search?q=speed+of+light+*+10ms

That’s in a vacuum, in a straight line. In fibre optic cable, light travels around two thirds of that speed.

i got curious (since you said you'd seen this years ago) and found my way to your cppcon 2016 talk. good talk but in particular i want to congratulate you on the weaving pun (first multithreaded tech).

Haha thanks. Not my pun, I just saw it somewhere on the internet!

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