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I have a cube sliced by a plane:

enter image description here

I would like to get the part of the plane inside the cube. So I figured a boolean modifier would the trick. Whether I apply it to the cube or plane or chose union, intersect or difference I always end up with some 3D object - some part of the cube. I would like to have only the plane part of the boolean.

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    $\begingroup$ Not spot-on, but maybe this helps? $\endgroup$
    – Robin Betts ♦
    Commented Mar 2, 2021 at 10:18
  • $\begingroup$ Yeah it close. I did look at the knife tool too. But this solution seem to require the both object belong to the same mesh. I'm not sure how to do this. $\endgroup$
    – DrDress
    Commented Mar 2, 2021 at 10:24
  • $\begingroup$ I'm not sure why it's not working for you. I took a cube, gave it the Boolean modifier set to Intersect and selected the plane as the other object. The result is the part of the plane that's inside the cube. Of course you have to make the original plane invisible, otherwise it will obstruct the view on the resulting boolean object. $\endgroup$
    – Gordon Brinkmann
    Commented Mar 2, 2021 at 10:28

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Following @Gordon Brinkmann's comment, in Blender 2.9x, using the 'Fast' Boolean option, (the modifier assigned to the plane,) it seems to work OK, here:

enter image description here

...across the angles.

enter image description here

But 'Exact' seems to fail; it includes the volume in the cube behind the plane's normal.

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  • $\begingroup$ Thank you! Just what I wanted... Seems like a bug. $\endgroup$
    – DrDress
    Commented Mar 2, 2021 at 10:56
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    $\begingroup$ nice animation by the way ;-) $\endgroup$
    – DrDress
    Commented Mar 2, 2021 at 10:56
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    $\begingroup$ Yeah, that's my setup only that I assigned the modifier to the cube - but on intersect it doesn't matter which object. Should not only work with Fast but Exact, too. I didn't give it as an answer because that's just the normal way to use the Boolean modifier... $\endgroup$
    – Gordon Brinkmann
    Commented Mar 2, 2021 at 11:08

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