Hi
I'm struggling to understand the material ID setup inside of Substance Designer over Painter. In 3ds Max, I've assigned a single material ID to my unwrapped meshes, but in Substance Designer, they're broken up into 4 different material IDs.

Why is this...? Is there a way of getting them to be just one ID? Also, is it possible to setup a material ID map like you can in Painter?
Thanks