I went back to watch the DICE GDC videos about photogrammetry in Battlefront. I thought somewhere though someone had a tech paper on how to blend individual rock assets with each other. With base terrain, you just render it first and you know the depth and blending between a rock and base terrain mesh is simple, but for seamless rock intersecting another rock, I don't remember the best technique.

good question, might as well throw light on how to do blending between terrain and rocks …