Metal map is applied to all meshgroups

[MishaPhysics]

I created a mesh with several meshgroups and assigned a texture for one meshgroup. I created additional texture maps, namely REFL, SPEC, METAL and RGHN. In game all meshgroups are reflective. Deleting the metal map fixes the issue, but it's not a solution, of course.

Screenshots:
https://www.orbiter-forum.com/threads/mesh-making-with-blender.41869/post-628383

Orbiter 2024.

[jarmonik]

A "solution" that works now is creating pure black *.rghn maps (and maybe *.metal) for all meshgroups that should not be reflective (metal)

Your, "solution" is the way it's interned to work. If you have *.rghn or *.metal applied to any group then the whole mesh switches to use a Metalness Shader in which case all mesh groups require metalness information either by texture or by material. In Orbiter2016-2024 meralness materials are applied via GC configuration files. They are very much obsolete already and will be removed from the next version of orbiter. In the future metalness material values are located in the mesh files. (This is a legacy from a closed sources age.)

Use of dummy textures for non textured mesh groups should be future proof method.

[MishaPhysics]

Thanks for your answer.

So, if I use *.metal map for one meshgroup then I should use dummy textures for other meshgroups or there is a way to disable metallicity in material (using "GC configuration file")?

By the way, what is the "GC configuration file"?

[jarmonik]

GC configuration files are located in /Config/GC/ They will apply material overrides for default DX7 mesh materials. Metallicity can't be disabled. Like I said, shader selection works in a whole mesh basis not per group basis.

Default metalness should be 0.0 (i.e. non-metallic).
Default roughness/smoothness is 1.0 (i.e. smooth, reflective) (probably bad choice, too late to change)

[MishaPhysics]

Excuse me, I have one more question. Are configuration files contained in /Config/GC/ work only with DX7?

So, if I use the only DX9 with Orbiter 2024 then the only way to hide metallicity from other meshgroups is creating dummy *.metal (or *.rghn) texture maps? Yes?

[jarmonik]

Configuration files in /Config/GC/ are D3D9Client specific (not DX7). Like I said before, these configuration files are very much obsolete already. Add-ons using them are likely not to work in the next Orbiter.