render using the section plan

[Gabriella.]

Hello, everyone! I'm new and I'd ask you something that's been sending me to the asylum for three days. I searched on the internet but nothing specific, only generic information about renders. step by step: having the need to do assonometric breaks of a villa I used the command "section floor" creating the section and so far everything ok. the problem arises at the moment when I go to make everything because in rendering the section plan is not "transparent" and therefore does not show me beyond the same. how do I then make a render of a section without the need to draw every single element that composes my villa?
I attach two pictures: one is the section of the villa, the other is the render.

ah I ask you one last thing: doing the section through the section plan the lights and consequently the shadows are the same as those I would have in the unsectioned villa? I'll explain better. Drawing every single element, then manually creating the section, I would go to "eliminate" the walls leaving a space through which the light would pass by distorting the final result. would the result be wrong even with the section plan?

I hope I've been clear, but for any misunderstanding, ask!
Thank you very much in advance! :redface:

 

[doking]

You thought maybe you could build a wall placed in doc so that by pulling the walls of the villa the light doesn't come in? or position the solid by orienting it with the source of light behind it so that the light can not enter the hand-drawn room?

 

[Gabriella.]

the problem is that I do not use point light but the distant light because I need to check if at various times of the day enough light enters

 

[lattu]

with light section plans and shadows are not correct.
you can do this job with different software type 3d studio max

part of your problem in making it solve by moving the section plan down (z negative) to remove it from the view of the room. the plan you don't see it anymore but you have the hairstyle