Align object on to surface normal

[Soroush]

Hi,
could u guys plz tell me how to align these object orientations on to normal surface?. I’m stucked with it

for sbarch.gh (130.1 KB)

[Cumberland]

You need to calculate the normal of the surface on the points where you want to insert the blocks.

Orient_on_Surface.gh (231.5 KB)

[Soroush]

Thank you for ur help