Unity 5 shader for Substance Painter

Here is SP viewport shader that emulates Unity 5 BRDF:

Download from Google disk

It's not 100% match unfortunately, but close enough.
It is how GGX-based BRDF  should work, not how it works in Unity.

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If you are interested in details, please read below. 

Here are some comparison pictures:

So, what's wrong?

- Unity using Gamma space incorrect lighting by default. 

COME ON Unity! How could that be even possible in 2016!

actually I spent some time figuring that out, this is why I am angry:)

Please change your color space to linear at Edit -> Project Settings -> Player -> Other Settings

and read this article if u are not too lazy: LinearRendering-LinearOrGammaWorkflow

If you still want to use gamma space, or you forced to, for any reason, there is an option to switch shader from linear space by disabling this checkbox:

- Unity Indirect BRDF part has an error in it, despite the fact it is an approximation. 

Dominant reflection vector(you may consider it as an average of all  R vectors for that point of view) of the glossy surfaces tends to tilt closer to surface normal, and with roughness=1 it becomes normal , and distribution becomes uniform, lambertian. However in Unity, environment map always samples from reflection vector, and that leads to incorrect reflections and light leaking.

I really hope unity will fix than in the next major update.