Do You have any idea how to solve this problem?
I tried make subdivisions in edit mode, also making offset near edges. There is less errors but it still looks horrible but UV map is a lot of worse (I need UV for walls with "sample text" to be this "cuted triangle" like it is now).
The mesh is the simplest as it can. It is surprise for me that sometimes it is no problem to texture complex mesh but with this simple mesh it is a problem. Maybe I am using wrong technique?