-Various file formats.FBX, Unity3D.
15 Realistic 3D rocks models_each with 1024 PBR textures and low Meshes.
Albedo : 1024 X 1024Metallic : 1024 X 1024Normal : 1024 X 1024occlusion : 1024 X 1024
You can make it efficient when you create backgrounds in the game.