{ x = i × ( δ l ) ; i = 0 , 1 , ⋯ , m − 1 y = j × ( δ l ) ; j = 0 , 1 , ⋯ , m − 1 z = k × ( δ l ) ; k = 0 , 1 , ⋯ , m − 1 {\displaystyle \left\{{\begin{array}{ll}x=i\times (\delta l)&;i=0,1,\cdots ,m-1\\y=j\times (\delta l)&;j=0,1,\cdots ,m-1\\z=k\times (\delta l)&;k=0,1,\cdots ,m-1\end{array}}\right.}
with: δ l = L / m {\displaystyle \left.\delta l=L/m\right.}