In order to make my 8k map I did not check Mosaic.
I'll try to add subtitle to the video so that you'll understand what I showed
I added subtitles en English in my video. If I did not add anything it is because what I was saying didn't really matter (after 2:07).
EDIT: I found a way to edit heighmaps in photoshop. Exporting from L3DT as PNG allows me to make any change I want to the texture and then export it as a Raw file from photoshop.
But sadly, even by making tiles by myself in photoshop (2048 first, and then 2049 in order to have one similar row to each tile), I can see the huge line.
EDIT2: I found this:
http://scrawkblog.com/2013/03/21/creati ... -in-unity/I tried it and on play it worked fine, but then I realised that TerrainComposer already has that "Neighbors" system. I deleted the editor and script file to see if Terrain Composer did it.
And it worked, the weird thing is that I'm sure that I tried to hit play several times before, without any result.
In my dozens of tries I saw that Terrain Composer took the wrong neighbors, and when I changed them, he changed them back automatically.
I recently realised that the 0x0 of L3DT was at the bottom left. For some reason all my previous tries were using the top left. I don't have find anything yet on why or how I fucked up, but I'm sure that I did.
I failed somewhere because the "Fit All" function did not fit corrrectly terrains most of the times.
EDIT3:
So I tried several things and ehre is how to do it:
In order to have a good tile, you need to export you tiles with +1 pixel in size.
The main problem was the Neighbors system. You need to place your terrains correctly so that terrains are correctly placed in the Neighbors script.
Then when you hit play, the seams will disapear automatically.