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An Iron Man Like 3D Hologram Controlled by Leap Motion and Three.js

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Re: An Iron Man Like 3D Hologram Controlled by Leap Motion and Three.js

#31

Post by tlrobinson »

ajacksified wrote: post #17
jasonkolb wrote: post #4

As cool as this is, it's not really a hologram. This is an example of Pepper's Ghost, which is also what's used to project images into your field of vision using Google Glass.

Classic HN, pedantic comments about this not being a hologram. You know what it is? It's a really cool demo of controlling a perceptually 3D image using a motion controller. Let's have, say, a discussion about the LeapMotion[1] (which is awesome, I have one) or the fact that it's using Javascript (this looks like it is using the packaged WebGL demo[2]). The LeapMotion is quite nice to use with WebGL / three.js. [1] h…

It's not even "perceptually 3D" though. It's a 3D rendering projected in 2D.

Re: An Iron Man Like 3D Hologram Controlled by Leap Motion and Three.js

#36

Post by ajacksified »

bradleyland wrote: post #30
ajacksified wrote: post #17

Earlier quoted context omitted.

Classic HN, pedantic comments about this not being a hologram. You know what it is? It's a really cool demo of controlling a perceptually 3D image using a motion controller. Let's have, say, a discussion about the LeapMotion[1] (which is awesome, I have one) or the fact that it's using Javascript (this looks like it is using the packaged WebGL demo[2]). The LeapMotion is quite nice to use with WebGL / three.js. [1] h…

It's not pedantic because it has a material effect on what we're lead to believe this is. This is hacker news. A hacker knows (and cares about) the difference between a "3D hologram" and Pepper's Ghost illusion, and that distinction is important in understanding what has been achieved. This is definitely a cool hack, but it does not involve 3-dimensional projection. This is a 2D image cast on to a 2D projection plane…

Too late to edit my top comment, so I shall reply here: I apologize for perpetuating the problem, because now there's several top comments discussing how parent was actually correct, and the real discussion is yet again derailed.

Re: An Iron Man Like 3D Hologram Controlled by Leap Motion and Three.js

#37

Post by robomartin »

ajacksified wrote: post #17
jasonkolb wrote: post #4

As cool as this is, it's not really a hologram. This is an example of Pepper's Ghost, which is also what's used to project images into your field of vision using Google Glass.

Classic HN, pedantic comments about this not being a hologram. You know what it is? It's a really cool demo of controlling a perceptually 3D image using a motion controller. Let's have, say, a discussion about the LeapMotion[1] (which is awesome, I have one) or the fact that it's using Javascript (this looks like it is using the packaged WebGL demo[2]). The LeapMotion is quite nice to use with WebGL / three.js. [1] h…

Down-voted your comment because you are confusing the truth with being pedantic.

This demo is neat. No question about it. I like when people play with ideas like this.

The demo isn't any more a hologram or 3D than if I took four LCD's, arranged them as the sides of a cube and turned down the lights. Other than not seeing through the LCD's, the images would be the same.

Again, as the person you are accusing of being pedantic said, this is no hologram and it isn't 3D in almost any imaginable way.

Notice how he moves from angle to angle quickly with the camera? That's because there are no volumetrics here. It's just a flat 2D image effectively seen through a 45 degree partial mirror.

It's a 2D image that appears to float in space. And it's cool.

Many, many years ago I thought about the idea of installing a screen spinning or translating (harder mechanically, easier imaging) at high speed in a vacuum chamber with transparent walls and then using lasers to project slices of a true 3D scene onto it. Challenging, but it would be really interesting to see how something like that works out.

Re: An Iron Man Like 3D Hologram Controlled by Leap Motion and Three.js

#38

Post by jonmrodriguez »

jasonkolb wrote: post #4

As cool as this is, it's not really a hologram. This is an example of Pepper's Ghost, which is also what's used to project images into your field of vision using Google Glass.

Someone could make a better version where the Pepper's Ghost display is an autostereoscopic stereo 3D display that uses a either a parallax barrier or lenticular lenses.

http://en.wikipedia.org/wiki/Parallax_barrier

As long as the user lines up with the center line properly, the image would be both "ghostly" as here and also stereo 3D.

Re: An Iron Man Like 3D Hologram Controlled by Leap Motion and Three.js

#39

Post by wpietri »

ajacksified wrote: post #17
jasonkolb wrote: post #4

As cool as this is, it's not really a hologram. This is an example of Pepper's Ghost, which is also what's used to project images into your field of vision using Google Glass.

Classic HN, pedantic comments about this not being a hologram. You know what it is? It's a really cool demo of controlling a perceptually 3D image using a motion controller. Let's have, say, a discussion about the LeapMotion[1] (which is awesome, I have one) or the fact that it's using Javascript (this looks like it is using the packaged WebGL demo[2]). The LeapMotion is quite nice to use with WebGL / three.js. [1] h…

Honestly, part of why I come here is for instant debunking of hype. So I appreciated it.
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