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Given multiple quaternions representing orientations, and I want to average them. Each one has a different weight, and they all sum up to one.

How can I get the average of them? Simple multiplication by weights and addition won't work, since it doesn't take into account that (qw, qx, qy, qz) = (-qw, -qx, -qy, -qz)..

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Google gives en.wikipedia.org/wiki/Generalized_quaternion_interpolation Someone who knows more may be able to expand. –  Peter Taylor Sep 1 '11 at 9:50

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up vote 1 down vote accepted

I assume you are thinking of unit quaternions and you are using them to represent rotations? If that is the case then here is a paper on the related subject of means and averages in the rotation group. It might not be a very easy read though if you don't understand the notation.

Barring that, Here's what I might try: Pick a canonical form for your quaternions. Then convert each to the canonical form and finally perform your weighted linear combination.

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