PBR can be used without raytracing. Instead of the previous models of using diffuse lighting, specular reflections (see Phong lighting for example), PBR is a se

PBR can be used without raytracing. Instead of the previous models of using diffuse lighting, specular reflections (see Phong lighting for example), PBR is a set of rules: how metallic is the object, what is the albedo, is it a conductor or a dielectric, etc. This gives us a common way to describe materials. What you do with this, is up to you. You can keep faking it with math that approximates real results, or you can do raytracing.