Hi,
So after you apply your splat to the terrain and want to manually paint some additions to the terrain, firstly it paints an entire quad and secondly you have to go over the entire terrain with your seperate layers until black marks are remove, which removes the point of using splat maps.
One final thing, anyway to speed to up Lightmass when baking terrains? I do use importance volumes and settings are set at preview. I’m trying out a 4KM terrain but this will eventually hang around 24K.