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I'm starting with a Bezier curve:

enter image description here

I convert it to a mesh, then duplicate it and mirror the duplicate on the X axis, then join the two meshes. Then I duplicate and mirror again, now on the Y axis, and join the two halves, and I get this: enter image description here

From there, in the Edit Mode, I hit 'F' to create a face and I get half a face: enter image description here If I hit 'F' a second time, it makes a second face: enter image description here My guess is that I'm doing something wrong when I join the different sections together so somehow it doesn't look like one long mesh. I've also done this where I've created the entire curve, all 4 quarters joined together, then extruded it along the Z-axis so it became a prism. I joined the faces on one end of the prism and still got two faces.

What am I doing wrong that all the vertices in the joined shape do not act like one set of vertices, but, instead, act as two sets? And, if there's no way to make it produce one face, what do I need to do to join the two faces into one? (I'm also open to doing more of this operation before I convert the curve to a mesh, but last I checked, there was no way to join two curves.)

Link to file with the original Bezier curve and the mesh just before I try to add the face is here:

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  • $\begingroup$ could you please share your object, the step just before you fill? blend-exchange.com $\endgroup$
    – moonboots
    Commented Jul 1, 2022 at 8:12
  • $\begingroup$ When asking what you need to do to join the two faces into one, usually you just have to hit F once again while both faces are selected. If that doesn't work, there is definitely something wrong with your mesh and it would be best to upload your file as @moonboots suggested. $\endgroup$ Commented Jul 1, 2022 at 8:44
  • $\begingroup$ By the way: you duplicate and mirror it on the X axis, then join the two meshes, then duplicate and mirror it again on the Y axis and join it? I would suggest you take the first quadrant, add a Mirror modifier to it, enable X and Y axis, make sure you have the Merge option enabled and then apply the modifier. $\endgroup$ Commented Jul 1, 2022 at 8:48
  • $\begingroup$ @moonbots: Added it at the end of the question. $\endgroup$
    – Tango
    Commented Jul 1, 2022 at 17:59
  • $\begingroup$ @GordonBrinkmann When I mirror it and enable both X and Y, I get overlaps or bad positioning. I'm not clear where to put the origin so when I mirror it, I get the shape I need. $\endgroup$
    – Tango
    Commented Jul 1, 2022 at 20:32

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If you zoom in close to your full curve, it is visible that the vertices are separate. Either do what @GordonBrinkman said on the original curve or do this:

Press M > Merge By Distance (After selecting all by pressing A) and then press F to fill, it will join the separate vertices and solve your problem:

enter image description here

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