I created a hole in the top of my door using a Cube and a Boolean modifier. I show you several screenshots of my Blender in various Viewuport shadings, where you can see right through the hole, into the blue colored hallway with a lamp in it.
When I press Render image F12, this hole is closed with a plane of some sort.
I do not understand this, in all other 3D views there is no face at all, no plane, it's a hole, why is there a plane visible in the final ender Image? I updated with an extra image in Solid View where I put the normals view on. This could explain something?
Thank you! Regards.
Final F12 render Image shows plane:
Normals view on: