On Inertia and rotational energy of a particle

Asked by socc on 2019-06-07

 In YADE document, it says that
"inertia(=Vector3r::Zero())
Inertia of associated body, in local coordinate system."
I am wondering inertia is actually a scalar,why here indicates it has three components?
If I want to an overall inertial (not three components)should I add or multiply them together?

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Last query:
2019-06-07
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2019-06-07

Hi,
Rotational inertia is a tensor, we represent it by the eigen values.
https://en.wikipedia.org/wiki/Moment_of_inertia
Bruno

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