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[Jan Stránský <question686076@xxxxxxxxxxxxxxxxxxxxx>]

Question #686076 on Yade changed:
https://answers.launchpad.net/yade/+question/686076

Jan Stránský proposed the following answer:
> However, the speed I cound not change during simulation.
> But the velocity can not changed.

Why?
Please always try to be specific. Did you get an error? What error? The velocity did not change? How did you investigate it? ...
###
RotationEngine(..., label="rotEngine")
...
def myRotation():
   rotEngine.angularVelocity = whatever
###

Concerning axis-angle, in Python Quaternion can be constructed directly from axis and angle:
C++: Quaternionr q(AngleAxisr(angularVelocity*scene->dt,rotationAxis));
Python: q = Quaternion(rotationAxis,angularVelocity*O.dt)

cheers
Jan

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