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I duplicate standard cube and scale down copy. Use copy to do boolean difference cut in original cube. Everything works fine.

But if I create similar size cube by extruding a rectangular plane and try same boolean OP nothing works. What's difference between a standard 3d mesh cube and a cube or any other 3d object that is created by extrusion from a 2d plane?

How can you turn objects created by extrusion into normal 3d objects that behave like they should?

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  • $\begingroup$ Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. $\endgroup$
    – Community Bot
    Jun 2, 2022 at 17:16

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If you extrude a plane, you have one chance out of two to have inverted normals, depending on the direction you choose. If the boolean object has inverted normals it won't work. So try to recalculate the normals, ShiftN in Edit mode.

enter image description here

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    $\begingroup$ +1 - but how did you calculate the probability that quick!? Can u explain this mathematically? 😎 $\endgroup$
    – Chris
    Jun 2, 2022 at 18:05
  • $\begingroup$ well, do you know a bit of quantic physics and the Schrödinger's cat? $\endgroup$
    – moonboots
    Jun 2, 2022 at 18:15
  • $\begingroup$ yes, you never know whether the cat eats the mouse or not ;) $\endgroup$
    – Chris
    Jun 2, 2022 at 18:16
  • $\begingroup$ it's a bit like Heisenberg....which is essentially: you never know... :D $\endgroup$
    – Chris
    Jun 2, 2022 at 18:16
  • $\begingroup$ exactly, so when you extrude you never know if the normals are inverted or not, which makes Blender quite dangerous to work with, it can explode any time :// $\endgroup$
    – moonboots
    Jun 2, 2022 at 18:19

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