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I'm making a knife. I have added subsurf modifier to the mesh. After adding the mirror modifier, the shape of the knife changes. The order of the modifier stack is the mirror on top and subsurf below. Why does the shape change?. Any suggestion or help. Thanks

Before adding mirror modifier

enter image description here

After adding mirror modifier

enter image description here

enter image description here

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  • $\begingroup$ Add an edge split modifier and set the angle to max (180). Does that give the shape you want? $\endgroup$
    – d8sconz
    Commented Dec 7, 2017 at 9:44
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    $\begingroup$ you have a very twisted ngon: i.sstatic.net/GudMa.png Nogons do not subdivide well. Also try to avoid non planar geometry. $\endgroup$
    – user1853
    Commented Dec 7, 2017 at 10:55

2 Answers 2

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The reason for the changed shaped is the Merge option.

The vertices of the blade are directly on the merge plane XY but they are connect to vertices on the handle, which don't get merged. This result in some different connections.

A solution could be to turn off the merge option on the mirror modifier.

enter image description here


BUT...

... your topology is horrible. Here are some steps to fix it.

  1. Grab the faces of the blade and move them down, of the XY merge plane. ⇧ ShiftRMB RMB > GZ
    enter image description here

  2. Don't use triangles, remove the upper edge of the triangle at the transition. ⎈ Ctrl↹ Tab > E, LMB LMB > XE
    enter image description here
    Create a new vertice by extruding. LMB LMB, E > [drag] > RMB RMB

  3. Turn on the mirror modifier again (not subsurf though), select the edges along the ridge and extrude them upwards so the mirrored parts are joined.
    enter image description here

  4. Your topology should be a clear flow of quads. If you wish you can counteract the smoothing of the subsurf by marking certain edges as sharp. ⇧ ShiftLMB LMB select them and mark sharp ⇧ ShiftE.
    enter image description here

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Your issue is here:

enter image description here

Merge those two vertices and problem solved:

enter image description here

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