5 ms·

I would be interested in reading more details about the technology. How does it work? How much power does it need? What makes manufacturing expensive? Can you m

by otibom 11y ago

I would be interested in reading more details about the technology. How does it work? How much power does it need? What makes manufacturing expensive? Can you make it bigger (holodeck sized)? Does it track the user's head position somehow or does it work for N users simultaneously?

ealexhudson 11y ago
If you look at the images, they look very much like stacked planes. I'm guessing - and it's a guess - that there is some largely-transparent device which can generate light on points on a plane, and that it is being rapidly moved up and down like a piston head, creating a persistence of vision display much like LEDs on a bike wheel. The low-light conditions the pictures are taken in support that I think - it might be that the "points on a plane" are some kind of florescent plastic and there's a scanning laser underneath drawing on it, so the amount of light being generated at any given point is probably very low.
- wnkrshm 11y ago
  Concerning the moving piston: Rather than have a moving plane, they could be using stacked, electrically-switchable films. Ones that you can switch from transparent to only translucent (i.e. scattering) very quickly. (http://en.wikipedia.org/wiki/Smart_glass http://en.wikipedia.org/wiki/Smart_glass)
  - munk 11y ago
    We did consider that but smart glass is too far slow to turn on and off for it to work.
- david-given 11y ago
  Bear in mind that this technique can only produce light, not absorb it --- which means no hidden line removal, so it'll be good for wireframe images only, where you can see all sides of the shape at once. That doesn't mean it's not awesomely cool, but it's going to have limited applications. IIRC, the piston-head technique has been tried before, and has always had the drawback that it's hellishly loud due to air displacement. I wonder how they're getting round this?
  - trevyn 11y ago
    A vacuum?
- munk 11y ago
  Yup, you've pretty much summed up the underlying principles of how it works, although we're not using a scanning laser.
nl 11y ago
It works for as many users as you can fit around it, from any angle, including above. It's a electromechanical device, so getting it to holodeck size may be challenging.

by otibom 11y ago

ealexhudson 11y ago

If you look at the images, they look very much like stacked planes. I'm guessing - and it's a guess - that there is some largely-transparent device which can generate light on points on a plane, and that it is being rapidly moved up and down like a piston head, creating a persistence of vision display much like LEDs on a bike wheel. The low-light conditions the pictures are taken in support that I think - it might be that the "points on a plane" are some kind of florescent plastic and there's a scanning laser underneath drawing on it, so the amount of light being generated at any given point is probably very low.

wnkrshm 11y ago
Concerning the moving piston: Rather than have a moving plane, they could be using stacked, electrically-switchable films. Ones that you can switch from transparent to only translucent (i.e. scattering) very quickly. (http://en.wikipedia.org/wiki/Smart_glass http://en.wikipedia.org/wiki/Smart_glass)
- munk 11y ago
  We did consider that but smart glass is too far slow to turn on and off for it to work.
david-given 11y ago
Bear in mind that this technique can only produce light, not absorb it --- which means no hidden line removal, so it'll be good for wireframe images only, where you can see all sides of the shape at once. That doesn't mean it's not awesomely cool, but it's going to have limited applications. IIRC, the piston-head technique has been tried before, and has always had the drawback that it's hellishly loud due to air displacement. I wonder how they're getting round this?
- trevyn 11y ago
  A vacuum?
munk 11y ago
Yup, you've pretty much summed up the underlying principles of how it works, although we're not using a scanning laser.

nl 11y ago

It works for as many users as you can fit around it, from any angle, including above. It's a electromechanical device, so getting it to holodeck size may be challenging.