Hi, i read from the other posts that i can't use any of the samples... which in want to know more about, is it only the textures that have to be custom or even things like trees, bushes, etc. And also the physics... Must that even be custom made?
Physics? What do you mean with physics? (If you mean the code no that has not to be done by yourself) All the assets however ,animations,models (also vegetation),textures,sounds etc. , need to be mad by yourself if you want to sell your game.