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[Question #687331]: How does the orientation of particle work in YADE?

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From: socc <question687331@xxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 20 Dec 2019 06:33:37 -0000
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New question #687331 on Yade:
https://answers.launchpad.net/yade/+question/687331


Hey,

I read about the orientation of particle from the document but the description is not explicit.
It says that the orientation is represented by a quaternion, which could be denoted as ((x, y, z)，w).  But how is each component defined? 
1. In mathematics, each of the component of the quaternion ranges from -1 to 1, and x**2+y**2+z**2+w**2=1. Is that true in YADE? is the w component a radians or a real number?
2. If I input a orientation out of the range ,let's say, a.state.orientation=(10,10,10,10),how will the code responds?

Thanks a lot !


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