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What happens when I press F while selecting two faces?

If I press F while selecting two faces, they appears to become merged... what actually happens? And if its not the way of joining/merging faces?

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What happens for real is a mega-super-wonky N-gon is created using all the vertices that are selected. F activates the fill tool, it appears to be vertex driven, that means it does recognize when a face is selected, just that there are four more vertices; hitting F forces blender to try to create a new face with all the vertices you selected as its extremities.

Lets assume that you were using nice, clean mesh, only quads. After selecting two faces, filling them

  • destroys the old faces

  • form a new 6-8 vertex face (depending on whether or not the faces were adjacent)

  • places the origin of the new face at the average of the vertices.

Now, I guess, this is essentially merging the two faces, but its bad form because it causes those dreaded N-gons, and you can see here what the results will be like when the faces aren't flush:

enter image description here

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You have to use the Bridge tool to merge 2 faces. Just press (w) and select 'bridge edge loops'.

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    $\begingroup$ Bridging two edge loops is different than merging faces. [F] does merge the faces, it just creates bad topology. $\endgroup$
    – PGmath
    Commented Aug 3, 2015 at 15:51

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