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[Question #234062]: Track rotation of particle

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From: kelaogui <question234062@xxxxxxxxxxxxxxxxxxxxx>
Date: Thu, 15 Aug 2013 04:16:07 -0000
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New question #234062 on Yade:
https://answers.launchpad.net/yade/+question/234062

I want to track the rotation angle of all the particles in a simulation process, for example a granular flow. 

To my understanding, YADE records the orientation of each particle in a quaternion way, but the rotation angle is not simply the angle between two orientations due to the 2PI period and the possibility of rotation direction (clockwise or anticlockwise). 

I want to output angVel*dt step by step from NewtonIntegrator engine. How to modify the C++ code? Or is there other way? Computation in python script is very slow.

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