File is written on a text file by Sebastiaan van der Fluit in January 2024
and can be used by sim end users but not by people who have comercial intrests
this was created by me in precious free time and needed a lot of work to create, 
also there is a guiding video tutorial for this subject specially designed and created by me though i am in noway responsible for any miss interpretation of this file by their readers and their understanding of it for it is simply for the joy of home cockpit builder and enhance their full homecockpit experience
also if modify or edit different files like camera.cfg, usercfg.opt or flight_model.cfg make a backup of these files before editing.
 

How to setup Multiscreen in the right proportion

A word from the author
Be aware it is a long read but absolutley worth to try and with just a movie it would not cover it all.
This due lack of time and use of materials to record it all.

Also this could be an enhancement and contribute to a solution for some stutters due sync with multiscreen and wide difference between the screens. this is in no way a statement but me as a user/writer of this writing observation,
because less data needs sync in fov and on multiple screens for they simply follow mainscreen  and all together they create on big screen depemding on how these are setup.   


Now there is a lot going on about, setup multiscreen in msfs on the forums,
lots like we need separate zoom on each screen we need more than one frustrum
separate this and that.

im sorry to say
But the approach of many people is about multiscreen is wrong.
Let me try to explain why;

First of all what is wrong; is setting up ingame.
This is where many of us setup because we spent so much time about 
hanging our monitors or tv bigscreens into our calculated positions, this is allright but does not make sense to set up shop.
off course this give dimensions and immersive and impressive experience to
have when becomming a desktop pilot and it is an absolute summon of thruth.

Me; i have gained 3 pc over the years
my oldest pc has; 
two gpu gtx 780 3gb each and 12 gb of ram

the second runs 2x rtx 3060ti 8gb each and 48 ram

the third runs 1x rtx 3090 24gb and 64gb ram

But why can i not set it up right? Has asobo developers done it wrong, microsoft is to busy with it commercialicing the sim and care not about us real sim pilots
the answer to that is complete and simple NO, offcourse they care yes a lot.

I can set it up very well alligned and with the right zoom
without the runway looks like a zipper, or cockpit got distorted and will
not get in a straight allignment, and when i do get it straighten out the surroundings outside are distorted. this is prove that you are wrong not as a person but in your approach on how you look at the sim and your personal point of view.

There are view things to pay attention to;

The screens angle and dimensions, be aware of them "but only because of peronal approach to realism". 
Your eyes and how this relate to the brain, they can "easilly fool eachother" 
(be very aware of this).
Think of it "as if a sphere in sphere, circles in circles aswell as lines crossing lines".
All is and are "connected". 

A little exercise of awareness for you

Imagine; you are in a very open place like a beach or a closed object like a car 
since flying is a very expensive hobby it is not realistic to name a airplane instead (but a car is for most of us very accesible), so look around; i mean in a realistic way like you are in the sim and move your head around like you are there right in the cockpit of your favorite airplane and search where you should find your instruments and the boundairies pan the view left right up down partitially with your headmovement, also translate position with your feet,
forward backward and side ways like you like.
now bend forward and backward and left and right like you would when looking up closely to your instruments which are not there if you are in an open space like the beach.

Also this described as the above lines, try to do the same but slowly and experience your feeling and view what is happening and try to remember this for it is most important in understanding. 
(I think Asobo and Microsoft do it very well although i have no other bussiness with them than enjoying their sim product at home and i want to accomplish that you will to. So this is why i want to share this as good as i can). 

Just to inform i had no education but figured this out by my own way of logical thinking since i have been simming since early 90s.

Once you understand all this mentioned above review this behind your desktop
and make the same movement from your seat and roll (instead of using feet) yo translate visualising (what you have done before in this text) but now in your simpit without running it and once you feel the right meaning of this scription
you are ready hold this vibe.

stay and be seated and start up the pc or multi pcs and screens
and start up the sim.

Once it is loaded go to > profile > my hangar and select your airplane or helicopter or whatever vessel you like to use (i use C172sp Classic for this but any will do).
Once selected; look at it in the hangar, paying attention to different details and from different positions, perspective and zoom and also detect where it goes wrong for you and your feeling. (this can diffur from person to person and different screens size).

The beauty with this method is, one airplane setup will fit all airplanes 

Now lets continue,
So you've selected an aircraft and viewed it from different angles and zoom factors, watching details in the hangar and the airplane outside and inside.
For yourself find the zoom you like or close to it, also absorb surrounding and find reference points like wall, corners, person and roof or window choose a few
floor tilling is a good one for this purpose. 
All this by moving freely through hangar with mouse controlwheel pressed in defaultsetting or default shift+arrow key outside the plane (which is in fact external view in the sim itself) translate view will not work here,
so move over inside the airplane by pressing end key to switch the camera to
inside the cockpit (in here translate view works by pressing arrow keys) but also 
like in outside view mouse controlwheel or shift+arrow keys work (it is like standing in on the beach or sitting in the car dont you think).  

With reference point in mind go back profile tab with esc key, and select options 
tab > general options > experimental. 
In here press create new render window.
This creates a window called window 1 (main is window 0 and holds versionnr of the sim on the bar left top side ) each window created here will have its own number 1,2,3 etcetera now this is handy if you want to manually want to edit usercfg.opt where you can recognize and separate the windows by their own number
the ones with monitor 0 is monitor nr 1, windowed 1 is monitor nr 2, FullscreenBorderless=0 
so here 0 means off
And windowed is bordered with a frame on monitor nr, windowed=1 
so here 1 means on.   

-Note that if there is doubles here in the sim with same window number, this is  from the usercfg.opt to have them both windowed and fullscreen to edit.

the added screens are setup by default from view position of main screen monitor a copy so to speak, with all rotations offset to 0.
Each slider on the rotation offset can rotate from 0° to 180° or 0° to -180°
this is what the sliders tell you.


The Lateral Rotation Offset  0°, to -180° or to 180° so 360°  
And it rotates the screen inside out around Left side in is right side out or
rightside in is left side out.

However there is a design flaw here, for there is no full lateral rotation
but only 270° roration and not 360° around its Lateral or y axis so 135° up to -135°
Not that it matters much only when you setup and surround yourself with 360° monitors but statistically not right
not sure if this affects flight when making aerobatic flights.
 (For Asobo to know)

The Vertical Rotation Offset 0°, to - 180° or to  180° so 360° 
pan the screen up and down or down and up



The Roll Rotation Offset     0°, to -180° or to 180° so 360°
And it rotates left or right the screen around. 

The meaning of these 3 axis is that they create a solid own focal point on the screen no matter if it is front left, front right,front left up, front right up,
front left down, front rightdown, left or right etc

say 90° lateral will be right in reality 67.5° (if above is taken in consideration) about lateral but monitor is say +/- a 45° angle from main monitor
so view will end up instead of 90° on screen to; front right ruffly said
now determine if it needs to go up or down  on the screen creating an * point at the left side of screen slightly right bottom and somerwhere in the middle of this imaginairy line all 3 lines together focal point is what create and detemine righteous zoom automatically. if not tune it and adapt, so it will be.  

now the best place to do this is the hangar because where else would you tune a airplane (for there are more than enough reference points to find) only downside is that you need adaption to make in general option > experimetal  add window screen to reach these axis. 
But the upside of this is mainscreen is next to the screen to adapt and ui experimental is not covering the whole mainscreen and through the edge you can still reference. 

Now if you edit camera.cfg of the selected airplane edit the line 
initialxyz= 0.03, 0.08, 0.15 and chance the first 0.03 in egt like -2.03 and save
the .cfg now this will position you outside the airplane and with up and down
right and left arrow keys; and up or down arrow key + left alt key you will be able to translate view like you are walking now you can walk to the workers in the Hangar and ask if you can take a tour on the site and ouside. LOL   





Though the logic behind this seems rather vague but none the less working well