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Extruding edges from a plane

I created a plane and extruded some edges from it on edit mode. As you see the screenshot, I filled the last two edges to make a rectangular donut. Then I selected all inner edges and tried to dissolve them. But some edges were never dissolved.

How can I accomplish it?

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  • $\begingroup$ I don't think you can achieve that kind of face in Blender. What are you trying to do ultimately ? $\endgroup$ – Gorgious Feb 27 '20 at 13:46
  • $\begingroup$ I just wanted to turn my faces to seamless, as scene Object Mode. Thanks. $\endgroup$ – Wisebee Feb 28 '20 at 0:12
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You can’t remove the last two edges. Removing them would leave a face with a hole in it, which Blender doesn’t support. Removing just one of them would leave a face that shares an edge with itself, which Blender also doesn’t support.

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A single face cannot have an hole, it should necessary be a closed shape.

I would suggest a different approach :

  • Start with a single face
  • Inset it (I)
  • Delete the central face

Nice clean topology, no Ngon, no concave face : enter image description here

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  • $\begingroup$ Now I understand a thing what can't be done. I will try to follow your way. Thanks. $\endgroup$ – Wisebee Feb 28 '20 at 0:15

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