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Re: [Question #692998]: principal axis of clump

To: yade-users@xxxxxxxxxxxxxxxxxxx
From: Jan Stránský <question692998@xxxxxxxxxxxxxxxxxxxxx>
Date: Sun, 13 Dec 2020 15:01:13 -0000
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Question #692998 on Yade changed:
https://answers.launchpad.net/yade/+question/692998

    Status: Open => Answered

Jan Stránský proposed the following answer:
> is there any functions which could calculate the inertia tensor??

not directly, but e.g a matrix representation of inertia tensor could be obtained by
inertiaTensor = state.inertia.asDiagonal()
or 
r = state.ori.toRotationMatrix()
inertiaTensor = r*state.inertia.asDiagonal()*r.transpose()
or
r = state.refOri.toRotationMatrix()
inertiaTensor = r*state.inertia.asDiagonal()*r.transpose()

Which one to use depends on circumstances.

cheers
Jan

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