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WereKitten said:
twesterm said:

Right now it only allows a single viewer but advances can be made.

If we steer our 3D technology to be dependent on glasses, we're always going to be dependent on the glasses.  If we steer our technology towards not using glasses, we'll find new solutions without glasses.  It's not something we can do right now and it's something I doubt we'll do soon, but it's still the better direction.

It's not about steering: they are profoundly different, both will evolve. LCD screens evolved in parallel to plasma ones. Only when one will be good enough at most the other does will the loser be totally replaced.

An auto stereoscopic 3D system sends out the two different images in two different directions. There could be multiple fixed points of correct vision, but an emitted  light ray is an emitted light ray: if your naked left eye intercepts a ray that was meant for your right eye you see it all wrong (flat or even 3d-reversed).

Thus any tech that will send out the images directionally regardless of the users positioning will always have troubles compared to one that has both images sent in every direction and filtering on receiving. The only way out is that the emitter knows the position of the watchers' eyes, through something like head tracking, and is able to adjust its occlusion or lenticular system to send the correct angles towards all viewers, which would be an extremely complicated achievement.

We might get there one day in ten years, and still for the time being the best solution for a home theater where several people can shift and move could still be glass based, thus the investments in this tech could still have value and benefit for the users.

Is this true? That the TV needs some sort of head/eye tracking to determine the proper position where to send the rays?

If so, you are right - glassless 3-D on big screen TVs will take at least 10 years.

And if so, I think I am going to make the investment and buy a 3-D tv within a year.