199Views25Replies

Author Options:

Anybody want a neat idea for a project? Answered

Picture of


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.

25 Replies

user
jeff-o (author)2011-08-30

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

Select as Best AnswerUndo Best Answer

user
Kryptonite (author)2011-08-22

Look at me go, I'm a giant!

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

Select as Best AnswerUndo Best Answer

user
kelseymh (author)Kryptonite2011-08-22

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).

Select as Best AnswerUndo Best Answer

user
Lithium Rain (author)kelseymh2011-08-22

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

Select as Best AnswerUndo Best Answer

user
kelseymh (author)Lithium Rain2011-08-22

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

Select as Best AnswerUndo Best Answer

user
Lithium Rain (author)kelseymh2011-08-24

Robot loves me more. Nyah, nyah, nyah!

Select as Best AnswerUndo Best Answer

user
Kryptonite (author)kelseymh2011-08-22

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?

Select as Best AnswerUndo Best Answer

user
kelseymh (author)Kryptonite2011-08-22

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 :-)

Select as Best AnswerUndo Best Answer

user
Kryptonite (author)kelseymh2011-08-23

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

Select as Best AnswerUndo Best Answer

user
Kiteman (author)kelseymh2011-08-22

Or like being a chameleon?

Select as Best AnswerUndo Best Answer

user
kelseymh (author)Kiteman2011-08-22

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

Select as Best AnswerUndo Best Answer

user
Kiteman (author)kelseymh2011-08-23

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

Select as Best AnswerUndo Best Answer

user
Kiteman (author)Kryptonite2011-08-22

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...

Select as Best AnswerUndo Best Answer

user
Kiteman (author)Lithium Rain2011-08-22

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

I still don't have them.

Select as Best AnswerUndo Best Answer

user
PKM (author)Kiteman2011-08-23

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.

Select as Best AnswerUndo Best Answer

user
Kiteman (author)PKM2011-08-23

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...

Select as Best AnswerUndo Best Answer

user
splazem (author)2011-08-23
user
Kiteman (author)splazem2011-08-24

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.

Select as Best AnswerUndo Best Answer

user
kelseymh (author)splazem2011-08-23

Didn't read the comments, eh?

Select as Best AnswerUndo Best Answer

user
rimar2000 (author)2011-08-22

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

Select as Best AnswerUndo Best Answer

user
Kiteman (author)rimar20002011-08-22

Except this is looking upwards, and streams live video.

Select as Best AnswerUndo Best Answer

user
rimar2000 (author)Kiteman2011-08-23

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.

Select as Best AnswerUndo Best Answer

user
lemonie (author)2011-08-22


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

L

Select as Best AnswerUndo Best Answer

user
CamWaite (author)2011-08-22

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

Select as Best AnswerUndo Best Answer