Is it good ideat to compress diffuse and roughness texture to one RGBA texture?

Development Asset Creation
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1

Is it good ideat to compress diffuse and roughness texture to one RGBA texture?

I’am going to make many models that will be using only diffuse and roughness textures, and I wondered if it is posible to compress them to one RGBA texture where RGB is diffuse and A is roughness.
Is it good idea?
How to set up something like this in UE?
What image encoding to use?

2

Yes, it is good idea. You do not need any extra setup. Pack them into any image editor and import into UE.

3

Indeed, similarly how RMA uses for texture budget. I usually use compressed textures for my all-level assets.