Black Spots and Corruption During Mesh Edit When I operate on my mesh, black spots and glitches appear. All the normals are aligned correctly and the UV is clean with everything in the right place. Here is an example of what happens when I seperate some faces;


Notice the triangular blotches on the edges.

Here is an example of subdivision on the mesh;



And again, similar corruption occurs when I delete doubles. I have no idea what could be causing this. Can anybody help please?
All right I don't know. I guess the problem bred from the software I used to extract the model (Ninjaripper). It created a weird data layer of normals information (sharp-edge, smooth-face, etc) which doesn't show up in the viewport edit. It makes precious little sense to me, and the man-pages aren't very clear on the subject at all.

The fix as I mentioned above is to remove the data layer before editing, then replace it again afterwards.

Run it up the flagpole...