Question #692998 on Yade changed:
https://answers.launchpad.net/yade/+question/692998

    Status: Needs information => Open

jsonscript gave more information on the question:
Hello,
    sorry for didn't ask the questions clearly.. I am conducting DEM of flat 
sands with clumps consists of several spheres,  some spheres are intersecting. 
I have checked yade and found that the function "inertia" could calculate the 
moment of inertia  in the space of principal axes, but didn't give the 
orientation of principle axes .  
    And my question is : how can we know the orientation of the longest axis of 
clump?? because sands are always flat..did the orientation of longest axis have 
some relation with the above principal axes of moment of inertia?

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