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I created this edge by linking the two vertices directly (Make Edge / Face):

enter image description here

Now I would like to split the quad face below along this loose edge. What is the solution for the general case where the edge crosses multiple coplanar faces?

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AFAIK, there is no way to use an edge (without even a plane) to divide a face.

What you need to do is delete the edge (x->edge) and then join the two verts, by selecting them and hitting 'j'.

If you've made a bunch of edges not realizing what you were doing in some other model, you can use mesh->cleanup->delete loose to delete all these edges, but I don't believe there's any way to transform them into cuts.

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  • $\begingroup$ Actually you don't have to delete the edge first. With the loose edge selected J will still cut the underlying face, turning the loose edge into an edge between faces. You can use Select Loose Geometry to find the edges you want to fix. $\endgroup$ – sambler Jul 6 '18 at 5:51
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    $\begingroup$ @sambler You don't have to delete the edge first, but you do have to delete the edge. $\endgroup$ – Nathan Jul 6 '18 at 6:38
  • $\begingroup$ Right you are, easy to miss two edges in the same position. $\endgroup$ – sambler Jul 6 '18 at 6:47

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