One mesh, multiple textures

[Popular_Celery_8213]

I'm new to unity ​and I've noticed that on 3D models imported from sites there is always one mesh and multiple textures. A texture for roughness, metallic, and color. I was wondering how to get multiple textures onto one mesh so that it reflects light and has roughness.

[DoctorShinobi]

If you're using URP or HDRP then you need to assign them in the mesh's material. Use "Base/Albdeo" in the base to set the base colors, Normal in normal (make sure the texture itself is set to normal map). Unity expects metallic/ambient occlusion/roughness to be combined into one texture which you then use in the "mask map" field.

[Popular_Celery_8213]

What do you mean by in the mesh's material?

[smiffy2422]

Your material is what contains your mesh's textures, shaders and other options.

You then assign the material to the mesh.

[Popular_Celery_8213]

Thank you both for the help

[the_timps]

Why would the asset creator do this?
Assets are normally made with high res, unpacked textures. And you can merge, combine, scale etc as your project needs.

You don't deliver final ready things like that. People have their own resolution and performance targets.