View Full Version : OT: Principle Axis Of Inertia of Tetrahedron

Kilam Malik
03-19-2002, 07:29 AM
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?



John Nagle
03-20-2002, 07:25 AM
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
03-21-2002, 10:21 PM
Thanks! That looks good.