Texture Channel Packing? What goes where?!

[rain-boy]

Hello. I have seen a lot of debate on this topic and I am hoping for some clarification.

For channel packing textures for a character, what should I use.

RMA?
ORM?
MRA?

I’ve seen comments saying you should always put your Roughness texture in the Green channel. Is that true?

I also noticed that after channel packing a texture, due to compression or some other reason I can’t understand, my end result looks different than if I just stick a dedicated Roughness texture into the Roughness channel output in my material. Somehow the values on my channel-packed texture is being changed.

I have the compression settings set to Masks (noSRGB) in the engine.

Thank you for any help!!

[BamaGame]

All channels are equal so there is no difference in usage.

The choice of method depends on your work. If you use noSRGB, you can select 3 of these in your package, and if you use SRGB, you can put 4 in this package.

and for that quality problem, you can modify this setting on texture.