private int DetermineDiceFace()
    {
        Vector3 upDir = Vector3.back;
        float x = Vector3.Dot(transform.right, upDir);
        float y = Vector3.Dot(transform.up, upDir);
        float z = Vector3.Dot(transform.forward, upDir);

        float xAbs = Mathf.Abs(x);
        float yAbs = Mathf.Abs(y);
        float zAbs = Mathf.Abs(z);

        if (xAbs > yAbs)
        {
            if (xAbs > zAbs)
            {
                return x > 0 ? 1 : 6;
            }
            else
            {
                return z > 0 ? 2 : 5;
            }
        }
        else if (yAbs > zAbs)
        {
            return y > 0 ? 3 : 4;
        }
        else
        {
            return z > 0 ? 2 : 5;
        }
    }