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I line up a shape to knife project, and I click the object being cut first. Then I enter edit mode and click the cutting object. Then I go to mesh and knife project. It says it completed it but it doesn't actually do it. Can anyone give me an explanation or a solution to this problem please?

https://www.youtube.com/watch?v=yV5Kl4o13VE&t=551s (Video Tutorial I'm following to try and make a helmet.)

Picture of the object with the "cutter" object in front of it. No lines from the cutter object are visible on the main object.

The outcome I'm hoping to get with the lines going onto the object.

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    $\begingroup$ might be several reasons. So that we don't have to guess, i would recommend providing your blend file so we can check it out. thx. $\endgroup$
    – Chris
    Commented Dec 17, 2023 at 7:17
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    $\begingroup$ @RobinBetts, right, if multiple cutting objects Ctrl key. Thanks for the edit. $\endgroup$
    – lemon
    Commented Dec 17, 2023 at 18:43
  • $\begingroup$ How do I provide my file within the question? $\endgroup$
    – apoc
    Commented Dec 18, 2023 at 0:22
  • $\begingroup$ I've also done the method to knife project the object, but it still doesn't work. It will say it has done the task but hasn't actually did it. $\endgroup$
    – apoc
    Commented Dec 18, 2023 at 0:23
  • $\begingroup$ @apoc, you can upload your file using blend-exchange.com and paste the obtained link in your question or comments. $\endgroup$
    – lemon
    Commented Dec 18, 2023 at 6:26

1 Answer 1

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Once you are in Edit Mode for the object(s) you want to cut, additionally select the cutting object(s) in the Outliner, using Ctrl. Then use the knife project.

If some parts fail to be cut, that could be due to doubled vertices. Merge by distance to remove them.enter image description here

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  • $\begingroup$ Thanks so much! Now I can continue my progress $\endgroup$
    – apoc
    Commented Dec 22, 2023 at 4:10

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