Testing the Blender 3D principled shader in the viewport

Test I’ve made while waiting for Eevee and trying to get the most of the real time graphics in Blender 3D. Because I really have no time to wait for some simple effects generated by the Cycles engine.

What I need is an optical accuracy and not the phycical correctness

Same as a real world artist painter. Fortunately that Eevee engine is gonna target that issue. So here I just used the material mode in Blender 2.79 to mix the Cycles Principled Shader with the OpenGL lights. It’s basically the same technique Eevee gonna offer.