i did a render of a model
i check all the doubles and remove doubles and check the normal
everything seems to be allright i did apply the smooth on
and i get theses nice artifacts in the render
one thing is that i dont’ have a row of vertices there ?
Are you using Sub-surf? It looks like sub-surf pinching cause by either internal faces or overlapping faces. Note: remove doubles will only remove verts that are in the exact same location (or within the limit you select 0.001 BU by default). Remove doubles will not remove internal faces or overlapping faces. If you are not using sub-surf, can you post a Wire frame or Blend file?