OT: Principle Axis Of Inertia of Tetrahedron

[Kilam Malik]

I know this is OT, but here are a lot of people coding technical applications.

I need to find the principle axis of inertia of a tetrahedron. Does anybody of you know a formula how to get this?

Thanks,

Kilam.

[John Nagle]

Do you want the inertia tensor, or what?
A symmetrical object obviously has no unique principal axis of inertia.

See http://www.cs.berkeley.edu/~mirtich/massProps.html
for code for computing the inertial tensor of a polyhedron. It's a neat little bit of math by Brian Mirtich.

[Kilam Malik]

Thanks! That looks good.

Kilam.