convert txt to obj

I have 2 text files: one contains coordinates of a 3D mesh grid with the first column the node number and then x, y, z coordinates. it has 16000 nodes. the second file contains tables of values of each node for different times. i.e for time = 0 there's a table of 16000 values then for time = 1 etc.

I need to convert those files to an obj file or STP file. any idea?