How to get up/gravity-vector from 3-axis accelerometer data?

AI Thread Summary
To extract the gravity vector from 3-axis accelerometer data for an iPhone augmented reality application, understanding the underlying trigonometry is essential. The user is seeking comprehensive resources or formulas that explain the process from the basics to advanced applications. They also require guidance on how to interpret the accelerometer data in a 360-degree context. The discussion highlights the challenge of integrating this data effectively for AR applications. Overall, the need for clear, step-by-step instructions or existing solutions is emphasized.
Gerra
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Sorry for the question duplication, but I've spent hours googling, and just have no idea where to start.

Just started an iPhone augmented reality application project, and stuck.
The accelerometer data provided this way - http://www.tuaw.com/2007/09/10/iphone-coding-using-the-accelerometer/".

The other problem is to get the data in 360 degrees.

The best would be a site/article/post/anything that explains me the whole problem/solution from the ground up, but if there is any "ready-made" formula with all the trigonometry, would appreciate as well.

If there's any advice, please don't hesitate to share with me, thanks in advance.
 
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