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I have a strange problem. I am doing the doughnut tutorial series, and things were going swimmingly until I some how lost part of the mesh in the UV editor. The screen shot below shows that I have a texture, and it's mapped to the object correctly, but a chunk in the middle somehow went missing or I accidentally deleted it. The renders now come out with black sections that matches the missing area in the UV edit. Is there a way to re-construct the missing mesh for UV editing ? I have tried unwrapping the mesh again, but this doesn't seem to have any affect restore a single and complete mesh.

--Update-- I've managed to select the missing mesh on the object, and attempted to unwrap it, but i can't make blender unwrap the selected mesh as 2d square.

Missing UV Mesh Shot01 enter image description here

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    $\begingroup$ Whatever is the reason, you need to unwrap again. You can use the Follow Active Quads method: Select all, then select one face to make it active, then unwrap with the Follow Active Quads mode and it should work... $\endgroup$
    – moonboots
    Oct 25, 2019 at 6:28
  • $\begingroup$ @moonboots thanks.. will try this, and update.. $\endgroup$
    – angryITguy
    Oct 28, 2019 at 0:11

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Rather than fix the missing mesh, the best approach I found was to simply "reset" the unwrap, select all faces, then UV Unwrap again and use "Follow Active Quads". (hat-tip "moonboots"). I had to resize the mesh in the UV editor and align it onto the material. Other methods unwrap the selected mesh in ways that makes it unworkable to fill areas. When you initially unwrap a mesh, Blender (2.8) automagically lays out the mesh to match the boundaries of the material, but it appears that you can't repeat this process without manually aligning it.

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