Rigidbody.inertiaTensor

Description

The diagonal inertia tensor of mass relative to the center of mass.

The inertia tensor is rotated by the inertiaTensorRotation. If you don't set inertia tensor from a script it will be calculated automatically from all colliders attached to the rigidbody. You can reset the inertia tensor to the automatically computed value by calling Rigidbody.ResetInertiaTensor.

// Expose tensor of inertia to allow adjustment from
// the inspector.
using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    public Vector3 tensor;
    public Rigidbody rb;
    void Start()
    {
        rb = GetComponent<Rigidbody>();
        rb.inertiaTensor = tensor;
    }
}