There are now Wall Worm material libraries you can get for 3ds Max for using in your projects. I've released two libraries today: Banded Rocks and Corroded Rocks.
(https://wallworm.com/store/image/cache/catalog/Materials/rock_banded-500x500.jpg) (https://wallworm.com/store/index.php?route=product/product&path=73&product_id=71)
(https://wallworm.com/store/image/cache/catalog/Materials/rock_coroded-500x500.jpg) (https://wallworm.com/store/index.php?route=product/product&path=73&product_id=72)
These libraries are $19.95 each but I'm selling them $10 each through Monday.