Arrows on a surface following a path I am quite new to Blender and I am trying to have arrows following a path snapped onto a surface. The arrows' direction must be normal to the surface. I tried so many different things, array + curves, particle etc. I just cannot make it happen. I attach what the surface in blue I have and the path I want the arrows the follow. You can see how the final result would look like 

. 

How would you procede?

Any help would be so very welcome!

Thank you very much
Unless I've misunderstood the question:

You could make cylinder (a ribbon) to shrinkwrap to the surface, and in its Object > Instancing panel, set its method to 'Faces'

Parent an appropriately oriented arrow-object to the ribbon, and Modifiers > Shrink-Wrap the ribbon to the surface by the projection method that best picks up the normals you're looking for.



You could even adjust the edges between the faces by hand, if you want finer control of the distribution of arrows. The ribbon does not have to be rendered, you can switch that off in the Instancing panel.