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[Jan Stránský <question661262@xxxxxxxxxxxxxxxxxxxxx>]

Question #661262 on Yade changed:
https://answers.launchpad.net/yade/+question/661262

Jan Stránský proposed the following answer:
> I want to record the rotation angle of one or more polyhedra around x
axis.

thanks, it makes it much more clear :-)

o = b.state.ori
v = o.toRotationVector()
ax = v.dot(Vector3.UnitX)

according to your needs, you can record it incrementally
deltaV = ori.toRotationVector() - oriPrev.toRotationVector() # oriPrev is stored externally
deltaAx = deltaV.dot(Vector3.UnitX)

not tested for "large" angles, e.g. if it rotates around x axis 2
rounds..

cheers
Jan

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