Get volume of an object in Unity3D - unity3d

Question

I'm writing a script for an Object in Unity3D.
I want to get the volume of my object.
rigidBody = GetComponent<Rigidbody>();
I'm looking in the documentation at the attributes contained in Rigidbody but I don't see anything I can use.
I tried using bounds but I found that rotation of an object changed those values even without size changing:
int getSize(Vector3 bounds)
{
float size = bounds[0] * bounds[1] * bounds[2] * 1000;
Debug.Log("size value = " + (int)size);
return (int)size;
}
What properties can I use to calculate the volume of an object?

Answer 1

The math is explained here.
In C# for convencience:
float SignedVolumeOfTriangle(Vector3 p1, Vector3 p2, Vector3 p3)
{
float v321 = p3.x * p2.y * p1.z;
float v231 = p2.x * p3.y * p1.z;
float v312 = p3.x * p1.y * p2.z;
float v132 = p1.x * p3.y * p2.z;
float v213 = p2.x * p1.y * p3.z;
float v123 = p1.x * p2.y * p3.z;
return (1.0f / 6.0f) * (-v321 + v231 + v312 - v132 - v213 + v123);
}
float VolumeOfMesh(Mesh mesh)
{
float volume = 0;
Vector3[] vertices = mesh.vertices;
int[] triangles = mesh.triangles;
for (int i = 0; i < mesh.triangles.Length; i += 3)
{
Vector3 p1 = vertices[triangles[i + 0]];
Vector3 p2 = vertices[triangles[i + 1]];
Vector3 p3 = vertices[triangles[i + 2]];
volume += SignedVolumeOfTriangle(p1, p2, p3);
}
return Mathf.Abs(volume);
}
Mesh mesh = GetComponent<MeshFilter>().sharedMesh;
Debug.Log(VolumeOfMesh(mesh));