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Grass issue on Massive Terrains
My terrain size is 10000x10000 and result thats it. Grass density, strength are %100. What to do?

It's still not good as i want with that.

Create a test 2k x 2k terrain, do a test grass paint - same results?
Answer by Eric5h5 · Jul 18, 2015 at 05:28 PM
The terrain splatmaps have a max size, so as you make the terrain bigger, the details necessarily must be sparser and more spread out. So instead of making one huge terrain, split it up into multiple smaller terrains.
If all you need if heightmap split, there is some info out there; I searched with Google and got
http://scrawkblog.com/2013/02/18/automated-height-map-splitting-using-imagemagick/
If you have a bunch of work logged into this project placing GameObjects here and there, I'm afraid there's no great answer.
You should accept Eric's answer as correct to your original question.