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I've been wrestling with this issue for the past couple of hours. Here's the gist of it (version 2.8):

I'm trying to "shave off" a piece of my mesh, and have a designated "knife" object. I intend on using the boolean modifier for this. Before using the modifier, I made sure both objects were water tight with correctly facing normals. I also applied all transformations. Yet, I still have an issue.

After applying the modifier, the "knife" object only "traces out" the pieces of the mesh that I wanted to cut, and does not actually delete the intended vertices.

I've included a YouTube link to a 1-min video that describes what I'm talking about (https://bit.ly/337UaC6).

Here's also a link to the actual blender file:

I've also included some pictures of my "main" object: enter image description here enter image description here enter image description here

Please let me know if I need to provide anything else. Any help is appreciated.

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  • $\begingroup$ You have here unconnected meshes (and possibly overlapping). Try to perform boolean operation on each part of mesh separately. $\endgroup$
    – Serge L
    Commented Nov 1, 2019 at 16:42
  • $\begingroup$ Thank you for your response. What part of the mesh are you suspecting is unconnected? $\endgroup$
    – orjün
    Commented Nov 1, 2019 at 16:47
  • $\begingroup$ @SergeL I checked my main mesh again—it was fully manifold with no overlaps/ disconnects. I also tried to boolean each portion of my mesh separately, but the same issue still persists. $\endgroup$
    – orjün
    Commented Nov 1, 2019 at 16:56
  • $\begingroup$ Share a file via blend-exchange.giantcowfilms.com for easier investigation $\endgroup$
    – Serge L
    Commented Nov 1, 2019 at 16:58
  • $\begingroup$ Done! Thank you. $\endgroup$
    – orjün
    Commented Nov 1, 2019 at 17:19

1 Answer 1

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  1. There are were inverted normals, so Shift+N to recalculate them.

  2. Overlapping edges between boolean cutter and source object. This is healed by moving edge away from the cut. It's a front view: yellow edge is source, white is cutter:

    enter image description here

  3. Lots of ngons, so consider doing retopology. I added Triangulate modifier to make it more boolean-friendly:

    enter image description here

Also keep boolean object's geometry as simple as posible, avoid excessive edges which doesn't contribute to final shape.

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  • $\begingroup$ Holy crap! Thank you! Didn't know about the Triangulate modifier. $\endgroup$
    – orjün
    Commented Nov 1, 2019 at 20:20

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