This routine creates 3D contour lines from 3D points. It was written for Autocad 2000, so there's no guarantee it will work for your version. See CTM Lisp Notes.
I already have something, but I wanted to post it on. Yet it seems that this site is in some kind of maintenance and until it's fixed I won't post it here. When and if it gets fixed you'll had to have its membership to download attachments. Or like dgorsman said you can hire assistance of someone that's paid to do the job for you. Kod produkta dlya origin plants vs zombies garden warfare. Even then I am not fully aware what kind of result are you expecting. All I can say is if you develop straight - no smoothing contouring you may achieve results for all situations even if contouring is passing through vertex of triangulation.
So good luck, M.R. Programmu antipampers dlya epson sx535wd.