Philosophy
The overall concept of TwinShot3D is to take two pictures: what the "Left Eye" sees and what the "Right Eye" sees, and combine them into one picture.
Just combining the photos would result in a blurry mess - the problem is both eyes will see both pictures. We need each eye to only see their respective image.
To enable this, we colorize each image in a special way, before merging them. Now, when viewed with red/blue anaglyph glasses, each eye gets the proper image, and stereoscopic vision is emulated.
Taking the shot
The goal is to take two pictures approximately at the same level, and the same direction, but separated by roughlt the distance between human eyes.
Using TwinShot3D effectively is pretty easy; with very little practice you can achieve stunning results. Since you are taking two successive pictures, a scene with a lot of motion isn't going to turn out well.
Let's begin...
Click the •⇦ button.
You will be prompted to take a picture with the standard iPhone camera control.
After you are satisfied with the shot, accept the photo with "Use Photo" button.
Now click the ⇨• button.
Then, while rotating the iPhone as little as possible, move the iPhone to the right approximately 3 inches (~7cm).
Also, try to keep what had been centered in the first photo, centered in the second photo. After you take the second picture, you will see both pictures superimposed on each other. It will be blurry. That's OK.
Now, touch on the image and drag. The right image will be moving under your finger, as the left image stays fixed. The goal is to now align the left and right image on one feature in the scene, usually something between foreground and background, and central to the scene tends to work best.
In this example, the circular sign on the wall was aligned for minimum 'blurriness'.
Almost done! the last thing you have to do is to click the "3D" button, to composite the scene.
You now have an extremely cool 3D image taken on your iPhone. Click the save button, and it will be added to your iPhone's Photos.
Happy 3D Photographing!