Syncing viewport and vray output

[gnome_mo]

Hello guys.
I'm new to V-ray,sorry in advance for noob question.
I've find that I have a problem rendering small spaces, bathroom for example.
Field of view doesn't really work for me, so I tried overriding focal length in V-ray Options---Camera. That works , but problem is, I never know what my final render will be.
My question is, can I somehow sync my viewport scene with my V-ray camera settings, not only Aspect Ratio (figured that one out - V-Ray Tools²), but focal length too? Or Zoom factor? Or film width?Anything that would allow me to see my rendered scene in advance in viewport.
English is not my first language, sorry if my post is confusing.

[Shiyan lin]

hi,gnome

I don't think change Fov in V-Ray is a good way

Firstly,Which version of V-Ray do you use?

In 2.0 you could try to apply skp2sided texture to the wall you don't want it to show up in the scene ,which can make the wall disappear and get a correct lighting result in your final-render.

However,in 3.4 you can apply a V-Ray Clipper to cut the wall which you don't want it to show up and also gets a correct lighting result which is so easy and could make your life easier.

Sorry for my poor English,might these be helpful?
Best