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When I loop cut a cube and fill a face in the middle, I can't loop cut the cube, I don't know why

Duarte Farrajota Ramos
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Bili_xiao
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    Each side of a face in blender must have a direction - this means each face must have an "inside" and an "outside" - for a simple cube, this is obvious - all the faces you can see from the outside are facing outwards. However, when you add a (2 sided) face in the middle of the cube, blender now sees one fully enclosed "half cube" (created by the addition of the additional face) with an open-top box attached to it. The geometry is essentially "disconnected" - this is why you cannot add a loop cut. – Christopher Bennett Aug 04 '22 at 03:05
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    https://blender.stackexchange.com/questions/7910/what-is-non-manifold-geometry/ – Harry McKenzie Aug 04 '22 at 03:29

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