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post #1 of (permalink) Old 05-16-2007, 10:59 PM Thread Starter
Headed for the Mountains
 
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Does anyone here ever play with creating 3D images?

I've played with cross-eyed images and flicker-3D. Here's an example of cross-eyed image from the meadow on McKee peak, looking generally west.



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post #2 of (permalink) Old 05-17-2007, 08:06 AM
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Very interesting! I'm gonna try that sometime.
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post #3 of (permalink) Old 05-17-2007, 08:31 AM
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This is part of my job, but with aerial photography. If you set the overlap so that that corresponding features in the two photos are not further apart than your eyes, you can view 3D without glasses. The problem is that if you do it often enough you may end up needing glasses for other things.
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post #4 of (permalink) Old 05-17-2007, 09:35 AM Thread Starter
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Ah! Someone with experience. I think I get what you're saying, but can you elaborate, or perhaps edit the photo to demonstate?

I'm aware also that there are two approaches to viewing 3D (excluding red/blue glasses and flicker-gifs): The example I have here uses the cross-eyed approcah. The other similar method involves looking 'through' the image, but I've never been able to acomplish that when I've come across images made for that method. Have you had luck with viewing those, and how are they produced?

I also have trouble remembering which photo should be on the left vs right, so I have a 50% chance of getting it right the first time. Is there an easy rule of thumb I can use for that one?

Here's another cross-eyed image:


And, I don't know if I can upload animated .gifs....

<edit: Nope. They end up becoming jpgs and so are not animated>
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post #5 of (permalink) Old 05-17-2007, 10:34 AM
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I'll elaborate when I get a bit more of a break later. The cross-eyed approach is very bad for your eyes, and gets worse with lower screen resolutions (larger images).
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post #6 of (permalink) Old 05-19-2007, 02:46 PM
 
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quote:Originally posted by magnetite

I'll elaborate when I get a bit more of a break later. The cross-eyed approach is very bad for your eyes, and gets worse with lower screen resolutions (larger images).
I can still feel the effects from looking at the first set. I remember trying the cross-eyes approach in cartography without being told about it, and it was a small revelation that it worked. But yeah, must be bad for your vision.
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post #7 of (permalink) Old 05-19-2007, 03:52 PM
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I must agree, the 3D pictures hurt my eyes. Not even sure why[?]
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post #8 of (permalink) Old 05-19-2007, 03:55 PM
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I'm wondering if it hurts my eyes because I'm comparing the two pictures...what would happen if I only saw the 3D pic and not the original[?] Could someone post a 3D without the comparison pic[?]...that would be great.
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post #9 of (permalink) Old 05-19-2007, 04:12 PM
 
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To get the 3D image, you have to go 'cross-eyed' so that your left eye is looking at the right image and your right eye is looking at the left image. Once you have this down, you'll see one proper image in the middle, with two partial images on either side of the middle image. Now the trick is to get the middle image into focus and once you do, you'll see it's in 3D.

When viewing a stereo pair this way, I think the image's relief is reversed. Valleys were ridges and vise versa.

Edit: when you're going cross-eyed, you keep going more so until a reference point in the photo (the background ramp in the second photo for example) becomes one. It's at this time when you know it's one image. It really can give you a minor headache after though, and who knows maybe your eyes will get stuck.
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post #10 of (permalink) Old 05-19-2007, 04:21 PM
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oic, no wonder it hurts my eyes...I was keeping them two images and comparing them...now if they could find a program other then my eyes to see the center picture that'd be great
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