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I wanted to apply a modifier between two cones. Here is what you can see before I make it visible:

enter image description here

and after:

enter image description here

As you can see, the bigger cone just disapeared. I tried to update the normals (Shift-N in edit mode or Mesh > Normal > Recalculate outside) of both the small and the large cone, still the same issue. Actually, the cone disappear even if I use union!

Also, to make sure that the pointy vertex is not removed, I made sure to shift a bit the smaller cone:

enter image description here

Here is the file: http://www.filedropper.com/01problememodifier

-- EDIT --

I also tried to intersect these two shapes: enter image description here

and here is the result (fast mode): enter image description here

In exact mode, I see nothing... but if I click on self, it works! enter image description here

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    $\begingroup$ Try turning the boolean modifier from exact to fast, sometimes that fixes it. $\endgroup$
    – Nascent Space
    Commented Feb 25, 2021 at 11:49
  • $\begingroup$ @NascentSpace I tried it but it's not working... $\endgroup$
    – tobiasBora
    Commented Feb 25, 2021 at 11:56
  • $\begingroup$ for me using fast worked, BUT I needed to move second object some, to make it intersect "simpler" $\endgroup$
    – llamerr
    Commented Jan 12, 2022 at 11:44

1 Answer 1

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I turns out that I just need to click on "self" on the modifer, no idea why it's not checked by default:

enter image description here

EDIT: as pointed out in the comment, the problem may be instead that the shape had double vertices (created when I turned the cylinder into a cone by scaling one side). Therefore, it may also be enough to remove doubles vertices (Edit mode > Mesh > Merge > By distance), thanks!

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    $\begingroup$ FYI the reason why it doesn't work is because you have double vertices. In edit mode select everything > Right click > Merge > by distance $\endgroup$
    – Gorgious
    Commented Feb 25, 2021 at 12:56
  • $\begingroup$ Really? Why do I have double vertices? Is the top of the cone considered as a multiple vertex? Thanks for the information. An any idea why self solves that? $\endgroup$
    – tobiasBora
    Commented Feb 25, 2021 at 15:28
  • $\begingroup$ It depends on how you created the cone : Did you use a modifier or the spin tool ? I don't know about the self parameter, it may force the evaluation with "welded" vertices even if they are not actually welded... $\endgroup$
    – Gorgious
    Commented Feb 25, 2021 at 16:19
  • $\begingroup$ For the cone, I started from a cylinder, and I scaled to 0 one side. $\endgroup$
    – tobiasBora
    Commented Feb 26, 2021 at 10:37
  • $\begingroup$ All the vertices from the side you scaled to 0 were on the exact same coordinates. visually you see only one vertex but they are actually several at the very same spot $\endgroup$
    – Gorgious
    Commented Feb 26, 2021 at 11:50

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