Problem after using diplace modifer I used displace modifier to give some uneven effect. and after that my modeling looks like crashed (or though, I tried to follow the instruction on utube, I might have made mistakes;)
so I searched this site. and some post says, 'remove doubles' but it still doesn't work;
Can I fix this? I even can not get a clue where this bad meshes come from;
It seems like some of the faces of your object have normals facing inside. You can try going into edit mode, selecting everything and pressing Ctrl+N or Mesh>Normals>Recalculate Outside.