RocksHD features 35 rock models including different geological types like sandstone, greystone, edged rocks, large formations and even dark lava rocks. It's aimed mainly at game-developers but also useable for all other people in the 3D field of course. Those models will kick-ass in Octane. I use them myself.
Each rock has been hand-crafted in Zbrush with also painted 2048px textures made from then high-poly bake including normals, AO and Cavity. The textures are seamless which means you can rotate each rock in any angle without looking at nasty edges or texture seams giving you all artistic freedom your project deserves.
Like usual lots of common model formats are supported: .max (2010), .fbx (2009), .obj, .3ds, .dae (OpenCollada) and .gmf (Leadwerks)
Also textures included in the .fbx for easy drag&drop functionality plus .dds 2048px normal,diffuse and specular setup.
You can see all models in this pdf: http://shop.pure3d.de/attachment.php?id_attachment=8
Or just go directly to the shop: http://shop.pure3d.de
Screenshots are taken in-game an real-time Engine.
The pack is 30 Euros so not even one Euro for each asset making it a no-brainer.
Plus the 20% discount for my 2nd company anniversary is also running. Don't miss it!