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I am trying to model a fish, I have a very simple model with quads only and a mirror and a sub d modifier, however when I turn on the sub d I get weird edges on top and bottom of the fish.

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after sub d

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enter image description here

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In the Mirror modifier make sure that "merge" and "clipping" is checked. Also make sure that there is no internal polygons running down the middle of the mesh.

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  • $\begingroup$ it was internal polygons thank you so much $\endgroup$
    – BlenderBoy
    Commented Jul 10, 2023 at 23:05

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