Perpendicular Orient to a surface!?

I have a surface divided and want to either build or orient objects alongside the perpendicular line of the points derived based on the surface.

Note: I am dividing my surface using Lunchbox Hexagonal grid tool. I have the points (Nodes) Derived from those. Hence I can not divide surface using traditional method. So once I have the nodes I want to be able to place or orient object perpendicular to the surface.

Moved to Grasshopper category.