Hexagonal map generating and lighting problem

So I'm generating hexagonal map from hexagonal prefab. Checking height with heightmap, adjusting height of middle verticles (red ones) and adjusting height of other verticles to blend with neighbour hexes.
The problem is lighting of the map - it generates hard edges between every prefab as seen below.
I know it's probably like this because multiple objects equals doubling verticles. Is there a way to kinda "weld" those neighbour verticles?

 

To get smooth shading, you would need to adjust the vertex normals of those edge vertices as well as the positions. You've matched the positions, but the normals (which you're probably letting the mesh auto-calculate) do not match across the border between hexes.

Any reason you don't create the whole map as one big dynamic mesh? That would be easier and probably more performant, too.

 

You mean procedurally generated without the use of premodeled mesh parts? I'll try figure it out, although don't know nothing about it yet.

 

But it looks like you're already doing essentially that, as you're warping the hexes to fit the height map. You could do the same thing using a mesh of the entire map at once — that would be even easier, because it would be literally just looking up the height for the XZ of each vertex, and updating its position accordingly.

 

I'm just saying that it's totally new for me to create mesh from scratch, expecially that complicated mesh. Trying to do it from now on.
Right now I'm trying to find out how many vertices would it have depending on the number of hexes, so I could create vertices array. And it's already preety hard.

@Edit:
Yeah, it's probably too complicated for me. I think I'll just go with borders that will cover up those edges.