Hello all! This is my first post but I find it necessary as I don’t find anything on the internet 
It is simple, I want to trace the path that the river must follow but it doesnt respond to the updates. What are the most important keys to know about the interaction with the landscape or other stuff in the map? I paint the map with a custom material that uses diferent UVs.
I spawn the river next to the lake:
Trace the link with the lake and so on:
You can see here now what is happening underneath the landscape:
This is the custom material:
I had problems with the material but always was about to restart the editor, change level and end up solving it.
I can provide more feedback. I would be so happy to receive support from you.