Question #671141 on Yade changed:
https://answers.launchpad.net/yade/+question/671141
Status: Open => Answered
Jan Stránský proposed the following answer:
> One question remained, if I use orientation=Quaternion((1,0,0),pi/4)
then how to calculate the rotation axis of the Rotation engine?
try (not tested)
quaternion * originalAxis
i.e.
Quaternion((1,0,0),pi/4) * Vector3(0,0,1)
cheers
Jan
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