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Bithur
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the faces you're subdividing are NGons, not quads or tris, because you subdivided the surrouding faces. Subdividing them adds vertices but no edge.
NGon problem

What you can do is dissolving the non desired vertices with X
enter image description heredissolve

Then joining them to makes edgesmake edge and faces, select 2 vertices and hit J
enter image description herejoin

subdivide smooth on the new edge and join
enter image description heresubd join

enter image description herefinal join

the faces you're subdividing are NGons, not quads or tris, because you subdivided the surrouding faces. Subdividing them adds vertices but no edge.
NGon problem

What you can do is dissolving the non desired vertices with X
enter image description here

Then joining them to makes edges and faces, select 2 vertices and hit J
enter image description here

subdivide smooth on the new edge and join
enter image description here

enter image description here

the faces you're subdividing are NGons, not quads or tris, because you subdivided the surrouding faces. Subdividing them adds vertices but no edge.
NGon problem

What you can do is dissolving the non desired vertices with X
dissolve

Then joining them to make edge and faces, select 2 vertices and hit J
join

subdivide smooth on the new edge and join
subd join

final join

Source Link
Bithur
  • 8.3k
  • 19
  • 57

the faces you're subdividing are NGons, not quads or tris, because you subdivided the surrouding faces. Subdividing them adds vertices but no edge.
NGon problem

What you can do is dissolving the non desired vertices with X
enter image description here

Then joining them to makes edges and faces, select 2 vertices and hit J
enter image description here

subdivide smooth on the new edge and join
enter image description here

enter image description here