While physically based rendering is a very nice idea, one has to be careful not to turn it into an ideology.<p>Specifically, in production, you very often have a situation where the artists wants to produce a specific effect and are simply <i>prevented</i> to do so by the rendering system because it strictly adheres to how light would behave in the real world.<p>This very severely constricts creative freedom and is one of the reason why these types of renders are used sparingly in actual VFX production.<p>The luxcore PB render, which someone mentioned in another comment, is a very good example of what I'm talking about: produces really nice realistic images, but it is darn near impossible to get it to do what you want when tweaking a shot.