this part is very important, i want to have a realistic texture for the ground, i don’t like use a ready texture and do simple uv mapping, as we can see in google images the texturing of ground is complex. so i have to do unwrap for that, before that i should do some fixing for the model because unwrap needs a clean geometry, some times i use zbrush or maya for retopo and uv of complex models, but this for this i used 3d max unwrap and exported into photoshop, so i could do anything that i want,
after creating base texture in photoshop, i added another coat layer for creating dirt. actually most of elements and materials of this project have dirt. i used a coat layer and add mask to create specific dirt.it takes time but it was necessary.
here we can see process of creating ground.