Is there any way to distribute vegetation with the use of splat maps?
An option would be to make landscape layers with the splat map and then paint vegetation on the desired layers. But I don’t want to have landscape layers ATM. So if there’s another way of doing it I’d appreciate your help.
Unfortunately there isn’t any way right now except for the way you describe using landscape layers.
Epic is working on better foliage distribution tools though that might arrive in 4.8.
They recently changed their approach, we don’t know much more other than it’s expected to be released in 4.8. For more info, just search for ecosystem and look for any posts from Ori, I’m guessing many of the features mentioned are still relevant despite their “new direction”.