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Is there anywhere a function, built in or not, that will mark (user defined) newly created edges, or leave the newly created edges highlighted for me to then mark or manipulate, if: The edge was made using a knife project cut, a slice operation in HOPs, a bool tool cut, a carver operation, etc...? I see many ways this could be used. it seems like it should already be an operation option already and i feel like i'm missing something fundamentalobvious. Any insight or direction to point me in would be appreciated.

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  • $\begingroup$ You could assign to a new vertex group (Ctrl G), you could mark as seam (U)... $\endgroup$
    – moonboots
    Sep 14, 2023 at 11:31
  • $\begingroup$ Thank you for responding but its not what to do with the selection. Its how do have those selections made for me upon cut operation. Manually having to go back and select those new edges is what i'm trying to avoid. $\endgroup$
    – Ferg
    Sep 14, 2023 at 11:43
  • $\begingroup$ of course, you need to save or mark as soon as you've created the edge $\endgroup$
    – moonboots
    Sep 14, 2023 at 11:50
  • $\begingroup$ Should i be expecting the edges say, of the knife cut or bool cut to be highlighted upon operation? i've been wondering if i'm crazy and thats the way it normally works and just isn't doing that for me now $\endgroup$
    – Ferg
    Sep 14, 2023 at 11:55
  • $\begingroup$ If you cut with the knife for example, the new vertices are selected, you can either save as a vertex group or mark seam, but I've never heard of being able to select them automatically afterwards if you've not done that $\endgroup$
    – moonboots
    Sep 14, 2023 at 12:03

2 Answers 2

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If you cut with the knife for example, the new vertices are selected, you can either save as a vertex group (CtrlG) or mark seam (U), but I've never heard of being able to select them automatically afterwards if you've not done that. But if you use a Boolean modifier for example, the carved part won't be selected.

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For the Knife tool, see the answer from @moonboots and for the Boolean modifier: well, before the modifier is applied there are of course no new vertices/edges selected because they are not yet created.

If you want to apply the modifier and mark the newly created vertices or edges as seams or put them inside a vertex group, there is no real automatic way of doing it, but a kind of workaround, you have to do two things before applying the modifier:

  1. The object that you want to be cut needs to have no vertices selected in Edit Mode.

  2. The cutting object needs to have all vertices selected in Edit Mode.

If you now apply the Boolean modifier and go into Edit Mode on the new object, all new vertices from the cutter are selected, while the original ones are not. Now you can either assign them to a vertex group with Ctrl+G or mark them as seams with Ctrl+E > Mark Seam or U > Mark Seam.

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    $\begingroup$ I knew the cutter's UV map and other properties are transferred, but I have no idea it even works for selection! $\endgroup$ Sep 14, 2023 at 21:57

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