I've made the two open vertical lines using the knife tool, but then when I try joining them with the J hotkey, I can't. Does anyone know why this happens? Thank you in advance.

enter image description here https://ibb.co/4Nmhwhg

  • $\begingroup$ How to upload an image to a post $\endgroup$ – Duarte Farrajota Ramos Jul 7 '19 at 1:39
  • $\begingroup$ Hi batFINGER, thank you for taking the time to help me. I normally use J to join two vertices in an N-gon, but this time it doesn't work. It turned out there are some duplicated vertices that render the operation failed. $\endgroup$ – Đặng Hải Phụng Jul 7 '19 at 6:06
  • $\begingroup$ it should work, there must be something in your topology that prevent you from creating the edge, maybe share your file $\endgroup$ – moonboots Jul 7 '19 at 8:53

In edit mode J will make an edge between two vertices, and also cut the underlying faces and edges crossed over by the new connection. This does not work if there is no face associated with a selected vertex.

In your screenshot, the lower vertex looks like it is on the horizontal edge but the lack of selection highlighting shows that it is a floating vertex with only one edge attached to it.

Also looking at the upper selected vertex, you will see that there are two horizontal lines, one orange and one black, this would indicate that you have two horizontal edges, one of which has the selected vertex, there wouldn't appear to be a face attached to these edges.

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