[Lab] Depth Perception

[Paul & Andrea Mumby]

Too bad stars are so far away that even with several kilometers of
stereo separation you likely won't get depth out of the starfield. Because
that would be damn cool...

- Paul

On Mon, Aug 22, 2011 at 4:21 PM, Darcy Whyte <darcy at siteware.com> wrote:

> Ah, I see, the eyes can can change their alignment to snap on to the 3d
> experience automatically.
>
> So the easiest solution is to just have the cameras stationary, perhaps
> converged a couple km out.
>
> Once adjusted you can see the clouds go by in 3d.
>
> I guess time lapse would be a great way to capture the material. Then you
> could play it back whenever you want and the motion would make it cooler.
>
> But if you wanted to go real time an pan, you'd need to make sure the pan
> rates are well match or it would "un-snap" you from the 3d experience.
>
> I bet you could get a nice 3d effect even if the cameras were only like a
> few meters apart.
>
>
>
>
>
>
>
> On Mon, Aug 22, 2011 at 4:01 PM, Jason Cobill <jason.cobill at gmail.com>wrote:
>
>>
>>    Alignment's not too tricky - generally, 3D movies aim the cameras
>> parallel to eachother and let your brain do the tricky work of converging
>> the images. They don't need to be exactly parallel for this to work, and
>> this is the reason some people get wicked migraines watching Avatar.
>>
>>    You can get the same effect as the XKCD experiment (and Avatar) with a
>> highly simplified process:
>>    - Find a point on the horizon and take a picture of it.
>>    - Walk a few feet.
>>    - Take a picture aimed at the same point on the horizon
>>    - Bring the two images together side-by-side on the computer
>> (preferably without border lines between them)
>>    - Cross your eyes really hard like you're looking at a "magic eye"
>> image, and they'll converge and you can see your clouds in 3d.
>>
>>    Or save yourself the effort of going outside and look at these:
>>    http://phereo.com/   (Be sure to click "Mode" and select "Crossed" if
>> you don't want to use special glasses)
>>
>>    The technique is really old - I have a number of friends with
>> collections of stereoscopic images from the mid 1800's! It was a fun party
>> toy for Victorians.
>>    You can find out a bit more here:
>>    http://en.wikipedia.org/wiki/Stereoscopy
>>
>>    Also worth noting that stereo pairs are extensively used in aerial
>> surveys - a plane takes two photos in succession and the pair can be
>> converged to get a 3d view. I've often spotted clouds, boats, and even other
>> planes in high-altitude aerial surveys. I should mention that the effect is
>> a little less exciting than the XKCD comic paints it to be. Having a pair of
>> stereo glasses definitely relieves the stress of staring crosswise and lets
>> you feel a bit more immersed in the image.
>>
>>    -Jason Cobill
>>
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>
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