Here my mesh, a simple tunnel with 2 modifiers :
1) Subdivision surface
2) Displace Modifier
In particular the displace modifier is created with the default library of Blender, Clouds like the image above shows.
Now i have imported this seamless map below and i want to use it instead of Clouds. There it is:
This is my workflow:
1) I upgrade my definition with sub. surf. modifier, getting almost 200k vertices (this new displacement map need a mesh with more resolution in order to have a decent result).
2) I apply the sub modifier.
3) I select all my mesh in Edit Mode and I used Smart Uv Project for having a Uv Map with these stats below.
4) I open the displace modifier and insert the new displacement map. Here the stats I used:
The final results is pretty decent but there is a problem: there are 3 seams, that I underlined in red.
What could be the problem causing this distorsion? I tryed with many seamless texture and there are always these three lines.
Is there a method to fix it?
Here's the file, just in case
EDIT: the problem could be created from seams of smart uv project. I tried with the unwrap and the results is this:
There is a way to fix it?