Physically-based rendering (PBR) :
PBR rendering is different compare to older methods of rendering, PBR is based on real world values, making it more accurate and consistent under all lighting conditions. It is the technology that powers AAA video games and high end renderers.
As we can see the physical base rendering allows the models to look so realistic when it has a physically shaded. To keep it even more realistic allowing you to put real life measurements will make it look even better overall.
NextGen Jamie 