public static void Negate(ref Matrix3x3 matrix, out Matrix3x3 result)
{
result.M11 = -matrix.M11;
result.M12 = -matrix.M12;
result.M13 = -matrix.M13;
result.M21 = -matrix.M21;
result.M22 = -matrix.M22;
result.M23 = -matrix.M23;
result.M31 = -matrix.M31;
result.M32 = -matrix.M32;
result.M33 = -matrix.M33;
}