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I have two Cylinders. To the first I apply a Subdivison Surface Modifier first (see the right object in the picture). Then I create a second object (cylinder left) and apply the Boolean Difference Modifier. The result is not a hole as I expected. How to cut a perfect round hole?

Boolean applied to Subdivision fail

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  • $\begingroup$ I just tried this and it creates a perfect hole, if the Subdivision is above the Boolean Modifier, but that is what your screen shot shows. There must be something else about your Meshes/setup that is causing the issue. Conversely, when I put the Sudivision below the Boolean Modifier then I get the hole problem you show. If applying Modifiers remember to apply them top down. $\endgroup$
    – rob
    Aug 15, 2018 at 13:58

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It looks from the screenshot that you don't have an object selected. This, in and of itself, is an odd behavior, as nothing at all should be happening, but it may possibly fix itself as you continue. Click on the orange cube in the Boolean Modifier (a list should pop down) and select the other object, or click on the eyedropper and select the other object that way.

As a note, no aspersion intended on rob, I'm certain it was a mistake, when applying modifiers, you apply from the bottom of the list upwards. CLARIFICATION: Whatever order modifiers appear, they should be applied in the order they're affecting the object. First in, first out.

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  • $\begingroup$ Interesting. If I try to apply the bottom modifier first I get an info warning that "Applied Modifier was not first results may not be as expected" $\endgroup$
    – rob
    Aug 20, 2018 at 18:28
  • $\begingroup$ What, really? Did they change the order of modifiers? I'll edit to be more specific as to the intended result. $\endgroup$
    – Lee
    Aug 22, 2018 at 14:10

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