So I was doing a fairly simple model of a Glock hand gun. I had already applied a mirror modifier to the model, that I had so far (which was the grip). Then I applied the subdivision surface modifier. At the point where the mirrored part of the model and the "real" part of the model met it collapsed inside of itself. Bellow will be a picture of the model. I would really appreciate it if someone could tell me how to fix this so I can get back to working on my model. Also the picture is the bottom part of the grip, it may looks like two smaller grips, they are supposed to form one. But like I said it collapsed in on itself.

Thanks, Nova

enter image description here

  • 2
    $\begingroup$ Try enabling the Merge option on the Mirror modifier. $\endgroup$ – user7952 Feb 18 '15 at 6:37

Your model seems to have faces at the border between the two halves, so to Blender it looks like they are separate.

  • Remove these faces
  • make sure that the mirror modifier is above the subsurf modifier
  • make sure that Merge is enabled for the Mirror modifier

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