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I am beginner, I am trying to made a car bumper and problem appears when I want to mirror my model (I modeled a right side half of bumper because is symmetric).

When I use only mirror modifier all is fine but when I want add subsurface modifier, my model has some bugs and mistakes.

With mirror and subsurface modifier

enter image description here

enter image description here

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  • $\begingroup$ Hi Marko, just curious simply ... Toyota MR2 or Lotus Esprit bumper or some completely different? ;) $\endgroup$
    – Jan Matys
    Sep 27, 2018 at 23:24
  • $\begingroup$ Hi Jan, this is BMW e30 M3 bumper , but looks similar like a Lotus Esprit $\endgroup$
    – Marko Kovačević
    Sep 30, 2018 at 16:29

1 Answer 1

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The problem you are facing could be that the middle of your bumper model, where the mirroring starts, isn't completely flat along the x-axis. You can fix this by selecting the vertices, scaling and then pressing X and 0.

After flattening the vertices, go to the properties panel by hitting N and put the vertice group to 0 on the x-axis.

Here are some pictures:

enter image description here The situation

enter image description here Select these vertices

enter image description here Scale to 0 on the x axis

enter image description here X co-ordinate to 0

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