Matrice 4*4 compatible MODA.

struct MODAMATRIX {
  union {
    struct {
      float _11, _12, _13, _14;
      float _21, _22, _23, _24;
      float _31, _32, _33, _34;
      float _41, _42, _43, _44;
    };
    float m[4][4];
    float m2[16];
  };
};