Direct3D & iPhone Accelerometer Matrix?

I think double integration is probably over-complicating things. If I understand the problem correctly, the iPhone is giving you a vector of values from the accelerometers. Assuming the user isn't waving it around, that vector will be of roughly constant length, and pointing directly downwards with gravity.

Try normalizing the acceleration vector first. (edit: after you check the length) (edit edit: I guess I need to learn how to read... how do I delete my answer?).

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