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I have a character where the hair particles of the back of the head penetrate the head surface and can be seen from the mouth. The picture shows a very simplified model of my issue.

I would like to keep the part of the hair that exists out of the head and delete the rest of it or at least delete the part that appears when you look inside the mouth (if it's open).

I tried the Boolean modifier but they don't work (I think because the head is a plan and has no volume). What else can I try?

enter image description here

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    $\begingroup$ Hair object position from the emitter surface is relative to its origin. That mean you can keep it outside modifying the origin point position. For more detail see for instance: blender.stackexchange.com/questions/147610/… $\endgroup$ – lemon Oct 20 at 14:33
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    $\begingroup$ Difficult to do it with another mesh to show you. That could work or not depending on the geometry and boolean operation. But convex hull is for the head only in the idea. $\endgroup$ – lemon Oct 21 at 17:28
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    $\begingroup$ @lemon Thank you so much lemon for your assistance. That's really appreciated. I know I ask hard questions. It's just because I'm too curious :) I'll do it manually. I'll go to edit mode (for the hair) and zoom inside the mouth and try to get rid of the extra faces of hair. $\endgroup$ – user2824371 Oct 21 at 17:38
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    $\begingroup$ What you can try is to make a sphere that is more or less deformed to fit your needs and use it for boolean operation on the hair. The guess is is the sphere is more regular, so it should work better with the modifier. $\endgroup$ – lemon Oct 21 at 17:40
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    $\begingroup$ A sphere is a good idea. It'll make the process easier. Thanks again :) $\endgroup$ – user2824371 Oct 21 at 17:42

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