Some initial testing with the Procedural Content Generation(PCG) plugin in the 5.2 preview 1.
First part is generating a forest inside the spline and some "road" splines that cuts paths in the forest and spawns some debris.
Second part is spawning some rocks depending on the normal, so like spawn only on steep areas.
Third part was testing to generate points on voxelized meshes.
00:00 Forest
01:40 Normal dependent
02:10 Voxelized meshes