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Correctly combining two Quaternions

  1. Nov 21, 2006 #1


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    Hi folks,

    I have a little problem which seems to be melting my brain. I have a (software) model which I wish to rotate based on the topography of the ground. I'm using two angles to represent the terrain - a "North" and "East" elevation (hopefully that's self explanatory).

    Once I have the quaternions for these two angles, how to I *correctly* combine them? Unless I'm misunderstanding something, multiplying the quaternions would result in the same effect as performing one rotation and then the other - which I think would be wrong (they're non-commutative, being about perpendicular axes).

    help? please? :confused:
  2. jcsd
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