So, I’m done with the first pass of the texture splatting. Using 15 256x256 textures in a single 1024 atlas. Posted a couple of ss below. Foliage is not using the splat material. Have some perf issues which has nothing to do with the texture splatting. Otherwise, bjs looks sufficient for generating low/mid-res terrains at 30fps.
Hope it helps. Cheers!