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As title mentioned, I want to get the rotation quaternion between two given quaternions. How is the algorithm and How to transfer it into Euler angle for better understanding? Thanks a lot

kint
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  • Have a look [here](http://stackoverflow.com/questions/8781129/when-i-have-two-orientation-quaternions-how-do-i-find-the-rotation-quaternion-n) for the first part of your question, and [wikipedia](https://en.wikipedia.org/wiki/Conversion_between_quaternions_and_Euler_angles) can help with the second part. – Martin Prazak Feb 17 '16 at 11:47
  • I am sorry but but the rotation equation should be q2=r*q1*r.inverse() rather than q2=r*q1(even the dimension is not correct), and thus the r can not be simply equal to q2*q1.inverse(). – kint Feb 22 '16 at 14:00
  • Your equation describes rotation of a _vector_; combination of two quaternions is quaternion multiplication. Just have a read of the wiki page - it is correct, trust me. – Martin Prazak Feb 22 '16 at 20:26
  • yes it is correct, thanks a lot – kint Feb 23 '16 at 21:31

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