Hi Rudi,

The "srfs" and "pnts" input parameters require to be set to their respective input types (Surface and Point) and to List instead of Item access. Download the file from here.
It would be better if you would post the further questions in the vb c and python coding section of the forum, instead of blog posts.

Thanks, djordje for your fast help and comment. I'll follow your advice to post this kind of questions next time in vb c and python.