Question #449020 on Yade changed:
https://answers.launchpad.net/yade/+question/449020
Bruno Chareyre proposed the following answer:
Hi,
You may pay attention to this warning in [1] ;)
Warning
Note the order of the arguments: the real w coefficient first, while
internally the coefficients are stored in the following order: [x, y, z, w]
Bruno
[1] https://eigen.tuxfamily.org/dox/classEigen_1_1Quaternion.html
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