*.ind

Format

indxO(1)   indxL(1)   indxR(1)   indxB(1)   indxF(1)   indxD(1)   indxU(1)
indxO(2)   indxL(2)   indxR(2)   indxB(2)   indxF(2)   indxD(2)   indxU(2)
   .          .          .          .          .          .          .
   .          .          .          .          .          .          .
   .          .          .          .          .          .          .
indxO(i)   indxL(i)   indxR(i)   indxB(i)   indxF(i)   indxD(i)   indxU(i)
   .          .          .          .          .          .          .
   .          .          .          .          .          .          .
   .          .          .          .          .          .          .
indxO(N)   indxL(N)   indxR(N)   indxB(N)   indxF(N)   indxD(N)   indxU(N)            // all are integers.

This outputs the indices of each nodes and the its neighbor indices.

indx_O(i): the index of i_th node.
indx_L(i): left
indx_R(i): right
indx_B(i): back
indx_F(i): in front of
indx_D(i): down
indx_U(i): up