/// <summary>
/// Combines the two identifiers using a variant of the Szudzik's function, removing the chance for duplicate
/// symmetric pairs. The relatively small number of physics bodies inside the scene allows the use of integers.
/// </summary>
private void GenerateHash()
{
int hashA = bodyA.GetHashCode();
int hashB = bodyB.GetHashCode();
int a, b;
if (hashA >= hashB)
{
a = hashA;
b = hashB;
}
else
{
a = hashB;
b = hashA;
}
hash = a * a + a + b;
}
