public static Matrix ToMatrix4X4(Matrix3x3 a)
{
#if !WINDOWS
Matrix b = new Matrix();
#else
Matrix b;
#endif
b.M11 = a.M11;
b.M12 = a.M12;
b.M13 = a.M13;
b.M21 = a.M21;
b.M22 = a.M22;
b.M23 = a.M23;
b.M31 = a.M31;
b.M32 = a.M32;
b.M33 = a.M33;
b.M44 = 1;
b.M14 = 0;
b.M24 = 0;
b.M34 = 0;
b.M41 = 0;
b.M42 = 0;
b.M43 = 0;
return b;
}