I have a problem with I try paint level : Landscape.
I just can paint square, do not know how to paint only what I want to “brush”
I press Ctrl + click, but does not work :
But in this video , He has the same problem, but it solves min: 8:34
Solved
Works if you paint all map
Not work correctly if you paint a particular area
I get it, apply two materials so that the other can degrade over the first.
Example: you apply the grass and stone and begin to degrade the stone.
I don’t understand that you can’t paint correctly … how in CE3
Go and say your prayers before you get hit by the same issue here 
You eventually will.