Window material makes others materials invisible behind it

[donmccurdy]

See:

Objects with transmission not showing objects behind

There’s a complex mix of transmission, alpha blending (.transparent = true), and opaque materials here, which you probably don’t want. Note that transmission only shows opaque surfaces behind it. Transmissive and transparent surfaces are not visible behind a transmissive surface. Also – it’s usually best to have .transparent = false on your transmissive materials, to keep metalness at 0, and to decrease roughness instead if you prefer crisper reflections.

Do the boxes need to be transparent? If so then you’ll need to use alpha blending (.transparent = true) instead of material.transmission for the windows, or a use different opacity technique like .alphaHash for the boxes.