The layer below is raised, but the lines appear.

[LeeJaeYoung]

In the 3D view, what is the reason for the phenomenon that is visible only on the 27th floor but not on other floors?

How should I handle the small lines that appear when switching to 3D Document?

This phenomenon also appears when the column at the bottom is changed to Home+2.

[Barry Kelly]

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@LeeJaeYoung wrote:

In the 3D view, what is the reason for the phenomenon that is visible only on the 27th floor but not on other floors?

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It could be because surfaces are not aligned perfectly (although they seem to be OK).

Maybe the surface materials are different?

Or possibly there are duplicate elements in the same location.

Barry.

[LeeJaeYoung]

Pillars and mods brought from the floor below.
So, in the 3D Document, only the bottom of the column has a problem.