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Anybody want a neat idea for a project? Answered


This is a project that really needs to be done for real, but I don't have the resources right now.

Come on, folk, get on it.

From XKCD.

Discussions

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jeff-o
jeff-o

9 years ago

I'd like to see this used in a 3D movie in a theater someday. Ooooh, imagine seeing this on an IMAX screen!

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Kryptonite
Kryptonite

9 years ago

Look at me go, I'm a giant!

Do this with two cameras on really big kites, about a hundred metres apart.

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kelseymh
kelseymh

Reply 9 years ago

That would make the viewer extremely seasick very quickly. Your 3D depth perception is possible because your eyes are a fixed distance apart, and you brain (technically, the V3 or V4, I don't recall which, visual centers in your brain) knows that.

If you set up a system with variable separation, your brain will interpret it as objects changing their size and distance uncontrollably. This is quite similar to the visual and proprioceptive hallucinations induced by some psychoactive drugs (THC and psilocybin, for example).

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Lithium Rain
Lithium Rain

Reply 9 years ago

So basically it would be weed and schrooms on DVD. :D

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kelseymh
kelseymh

Reply 9 years ago

Hey! How come your post didn't get caught in the filters, eh?

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Lithium Rain
Lithium Rain

Reply 9 years ago

Robot loves me more. Nyah, nyah, nyah!

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Kryptonite
Kryptonite

Reply 9 years ago

So I've just invented a hallucination simulator? ...neat.

Kites can be faairly stable, but a metre sway on a hundred metre long bit of string isn't much at all.

Buildings? Mountains? Charter planes?

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kelseymh
kelseymh

Reply 9 years ago

The XKCD idea of placing them on goal posts at either end of an American football field seems quite reasonable. You could do the same with a (real) football pitch, provided hooligans don't come in and steal the Webcams from atop the nets :-)

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Kryptonite
Kryptonite

Reply 9 years ago

If I had $100 to spare, I'd totally do this.

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Kiteman
Kiteman

Reply 9 years ago

Or like being a chameleon?

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kelseymh
kelseymh

Reply 9 years ago

Dude, can I get a hit off that doobie? You must have some primo stuff!

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Kiteman
Kiteman

Reply 9 years ago

It's the eyes, man, the independent eyes...

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Kiteman
Kiteman

Reply 9 years ago

Kites I can do (and they wouldn't need to be that big) - it's the two webcams and enough kit to use them 100m apart that's the problem.

It would be pretty cool to see this done in 3D video...

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Kiteman
Kiteman

Reply 9 years ago

That's why I said "kit", not "cables".

I still don't have them.

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PKM
PKM

Reply 9 years ago

As someone points out on the XKCD fora, the length of a football field might not be necessary. The average interocular distance is only something like 65mm, so stretching it out to 10 metres (a cheap 5m USB extender cable on each webcam in opposite directions) would increase that by a factor of about 150.

Anecdotally, stereo vision works best at distances below 10m, which means a 10m baseline would provide good depth perception up to 1500m (almost a mile), easily enough to play with low-level clouds.

If you wanted a nice parallax view of your local mountain range tens of miles away, then a hundred metre baseline would be better- then you'd probably be best off getting two friends a few streets apart to aim their webcams in the same direction and use the web to get both feeds.

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Kiteman
Kiteman

Reply 9 years ago

I can't decide in advance, but I have a hunch that seeing mountains in such "wide 3D" might actually make them seem smaller (they'd "have" to be small, because they'll "have" to be close, or you wouldn't get such a big difference in the views from each eye).

That last frame might be true...

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splazem
splazem

9 years ago

You should do it...

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Kiteman
Kiteman

Reply 9 years ago

I don't have the kit, and, since I have just received my last payslip for the foreseeable future, I can't really justify buying it on the inspiration of a comic strip.

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kelseymh
kelseymh

Reply 9 years ago

Didn't read the comments, eh?

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rimar2000
rimar2000

9 years ago

3D aerial photography or aerial stereoscopy was used from the beginning of aviation, Kiteman. It is the same principle.

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Kiteman
Kiteman

Reply 9 years ago

Except this is looking upwards, and streams live video.

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rimar2000
rimar2000

Reply 9 years ago

Yes, but taking two images from two different places, you have a 3D pair. They look them with stereoscopes to detect orographic details.

Besides, at first there was only photos, no videos.

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lemonie
lemonie

9 years ago


OK I get it, that's interesting...

L

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CamWaite
CamWaite

9 years ago

I saw this, this morning and thought about putting it up here...