Hi OSTexo, the regular Construct > Curve > Iso command will let you click several points on a surface for generating isocurves, are you looking for something different than that?

Max also wrote a script for generating multiple isocurves in one shot I think, look for MultiIso on his file archive: http://moi.maxsm.net/media/files/ the thread for it is here: http://moi3d.com/forum/index.php?webtag=MOI&msg=6841.1

- Michael