What if you put a very high ior in? The perpendicular reflections will increase a lot, but they still won't be 100%. In fact, this is how metals behave.

With ior=30 - I get a chrome-like metal!

Metal IOR is actually more complicated than this, but for most purposes we can do a lot of metals using TrueFresnel with a high ior. Colored metals will take a little more work, though. We'll come back to this topic later.

---

Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)