I'm very hesitant to purchase any 3d model assets from the store unless they contain the source. (The FBX is not the source because most often the FBX cant be opened and modified). There's an asset for Ground Debris. The heap piles are all .FBX, so you can't tweak it. So you would end up with every single debris pile looking the same. So, sorry, I won't be buying your asset.