Whatever happened to 3-D video without glasses?

[nuxvomica]

A "Coraline" thread reminded me of this.

I remember back in the late 70s watching a show called "That's Incredible" in one segment of which they showed a video, I think it was of a tetherball bing knocked around, that was in 3-D, right there on my little black-and-white TV screen and I didn't have to wear glasses. IIRC, it had been invented by a couple of guys in their garage using existing computer equipnment. They had somehow processed a 2-D video signal into a format that appeared 3-D on the screen. There was a little bit of video flutter near the edge of the screen and that was something they said they were working on removing. I've heard nothing about this since.
Maybe they didn't have enough processing power to perfect the process, but I'd think they'd have it by now. So if it was possible to broadcast a prototype in the late '70s why hasn't technology reached the point where we don't need the glasses for 3-D today?

[HopeHoops]

1. It is an illusion created by alternating the views at a high rate - not as effective.

The polarized glasses give the best effect.

[nuxvomica]

2. The effect worked well for me but maybe not for other people

I keep thinking that all we have to do is throw more engineering at a problem but I guess there may be limits, like maybe it gives people headaches. :shrug:

[HopeHoops]

3. Two problems: 1) seizures; 2) brain can adapt and eliminate the effect