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Blender newbie here, attempting to model some things and experiencing issues with subdivision and with odd things generating where there shouldn't be, not sure how to describe it but hopefully videos will show what I mean.

https://drive.google.com/file/d/17yxSbMX708quhmW1K4fpA_6hY90ObYI4/view?usp=sharing https://drive.google.com/file/d/1wOkDcvhu0unBOIQIGEppBo-MZZs7C0cD/view?usp=sharing

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  • $\begingroup$ Hello it looks like you've selected the edges of a big ngon face? If you subdivide it will just subdivide the edges, i.e. create new vertices along these edges, not create small faces within the big face. Maybe first remove the big face and use a tool like Grid Fill to create quad faces? $\endgroup$
    – moonboots
    Feb 22 at 7:16
  • $\begingroup$ Makes sense, thank you. Next I figure out how to mark an answer... $\endgroup$ Feb 22 at 7:18
  • $\begingroup$ I can make it an answer but first try the solution and tell if it works? $\endgroup$
    – moonboots
    Feb 22 at 7:20
  • $\begingroup$ Next time you ask a question, try to describe the problem with words. Something like: "I've added a vertex to an edge, and now the subdivision modifier doesn't look right" Moreover if you want to add a split to the face use ctrl+r $\endgroup$ Feb 22 at 9:47

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It looks like what you select is not a grid of quads but a big ngon, i.e. a face with more than 4 vertices, like this for example:

enter image description here

If you subdivide this kind of face it will just add vertices to the edges, it won't subdivide the face itself. To create a grid made of quads, first thing select all and X (Delete) > Only Faces then CtrlF > Grid Fill:

enter image description here

Result (now you have quads only and it will subdivide correctly if needed):

enter image description here

That said we need to see the whole topology because it may not be a good idea to subdivide this part only. Also, another way to add topology is to join vertices (J) or use the Knife tool (K).

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