Floor/Slab Cutout for Window Niche Not Displaying Correctly in 3D/Section

Heftor — Wed, 17 Sep 2025 16:59:25 GMT

Hello everyone,

I'm having an issue with getting a floor element to display correctly in a cutout I made for a window niche. I'm hoping someone can spot what I'm doing wrong.

My Setup:

I have a Level with basic walls.
I placed a Slab for the main structure of the floor.
I have a Window that includes a niche.
To model the finished floor, I placed a Floor element on top of the structural slab.

The Problem:
The window's niche correctly cuts a hole out of the Wall. However, the Floor element on top of the slap is not following this cutout.

In the 3D view, I can see the floor running straight through the niche.
In a Section, the same issue occurs; the floor doesn't stop at the niche opening.

What I've Tried:

I used the Cut Opening tool from the Floor's context menu to manually trace the niche opening from the window.
I confirmed the cutout is there in the Floor Plan.

Despite the cutout being present in the plan view, it is not generating in the 3D model or sections.

My Question:
Why would a manually created cutout in a Floor element show correctly in the plan but not generate in the 3D view or sections? Is there a specific setting or priority I'm missing? Or is it just a bug on the program?

Thanks in advance for the help,

Hector

Operating system used: Windows

Re: Floor/Slab Cutout for Window Niche Not Displaying Correctly in 3D/Section

Barry Kelly — Thu, 18 Sep 2025 00:39:42 GMT

Similar issue and possible solution here ... https://community.graphisoft.com/t5/Modeling/Floor-through-niche/m-p/669261

Barry.

Re: Floor/Slab Cutout for Window Niche Not Displaying Correctly in 3D/Section

Heftor — Mon, 29 Sep 2025 14:12:46 GMT

Thanks Barry for the tip.

I was experiment and it works as it should when you use the opening instead of the niche, looks like the niche behaves as a wall for the floor.

Now it´s too late because i made before all the windows with the niche options and i do not think i have the time to fix all of them with the openings.

Thanks anyway,

Hector

topic Floor/Slab Cutout for Window Niche Not Displaying Correctly in 3D/Section in Modeling

Floor/Slab Cutout for Window Niche Not Displaying Correctly in 3D/Section

Re: Floor/Slab Cutout for Window Niche Not Displaying Correctly in 3D/Section

Re: Floor/Slab Cutout for Window Niche Not Displaying Correctly in 3D/Section