You can download Materialize and play around with it, and mess around with the RGB channels.Thank you for your answer!I'm very novice in Blender,in fact I started using it almost a week ago.The metal panels was found free on the net,I just convert them in Blender to use them in MSFS.However during the proccess I assign to them only the base texture eventhough there were available also other .png files,a "normal",a "metallic",a "smoothness" and I think a "roughness" one (?) because I didn't know how to use them and for what each one of them is used for.I suppose I'll have to experiment with these ones quite a lot although It will be hard to know how thinks will look like inside MSFS as it mostly seems that it has its own way on how Blender exported objects are shown.It will be more or less a trial and error proccess.
You can also see your object updated in FS 2020 in real-time from Blender to the SIM, as long as you have added the object once already.
Here is my general process for this:
1) First rule is, NEVER have the compiled airport or scenery in your community directory when you are working on an airport, always load the project in the editor window. I've had problems if having the compiled airport already loaded and then loading the project. This will cause endless issues, at least it did for me.
2) Always get a first "version" of a model compiled into your project, and usually you have to completely restart the sim at this point (as in completely exit game and reload, not just reload the airport). Sometimes it does work without restarting game, but I think it depends on the compiler's file locking state to whether it will work or not, I just always completely exit and reload to be certain, because for me it only worked maybe 20% of the time without reloading.
3) Once you have a given model already in your Scenery list of Objects you can choose from, then you can place the object on the ground and you will no longer have to reload the game, and often it will work without even having to reload the airport! Now when you export the object from Blender, any objects you've already placed at an airport will be updated in real-time with a few caveats. If you change the texture itself, you may need to re-export, re-compile, and reload the project. Although sometimes there is a file lock where it won't release and causes you to need to reload the game to see an updated texture, but this process usually works.
4) If the above works correctly, you will actually see your object while sitting at the airport blink for one second and come back refreshed with the newly edited version. Now you can in real-time just quickly export the same model over and over again to keep seeing what changes in Blender are affecting how the model looks in FS 2020.
I only started Blender around 3 years ago, but I would suggest CGTrader.com or any site that sells models that are already textured and spend like $5 or so to buy a few cheap models that have PBR textures on them. Load them in Blender, then try to get them into MSFS 2020 to match what you see in Blender. You will generally need to invert the Normal (g) and adjust Roughess/Smoothness maps to match what FS 2020 wants, but even when I've done that it doesn't always translate 100% exact (sometimes, depends). You can use Photoshop, Materialize, or Gimp to invert or edit the maps.