Substance Materials

For all my PBR textures I use Substance Bitmap2Material application because it is very easy to use and you can tweak values and adjust your textures very easily. I spent almost half of a day to get them how I wanted. I could also go back and change if I needed a different result as the workflow is very flexible. Unity has implemented it as well so you can do all your work straight inside the engine, but I just wanted to keep the modifications outside because it tends to get very messy as you progress.

I won't put all my textures here because I have so many, but just some to have an idea of how good the outcomes are compared to other methods, I found this one so easy and works flawlessly for me:

So the order is albedo, normal, metallic, glosiness, ambient occlusion. I know that for the PBR process there are 2 workflows: specular/glossiness and metallic/roughness. I chose the latter one, but Unity has a different approach on how PBR works inside the engine so if you are using the metallic workflow you need to invert your roughness map into a glossiness according to the tutorial, and that works just fine. Here is another example:

Same for this material as well, I skipped the metallic map as the relief has no metallic properties so I just used a black texture. Here I have some previews of the material in Unity:

References

Allegorithmic, 2014. Bitmap2Material 3 - Walkthrough Tutorial. [Online]
Available at: https://www.youtube.com/watch?v=UKQTMHVOMKk
[Accessed 24 April 2017].

Unity Technologies, 2017. Unity - Manual: Metallic mode: Metallic Parameter. [Online]
Available at: https://docs.unity3d.com/Manual/StandardShaderMaterialParameterMetallic.html
[Accessed 24 April 2017].

Unity Technologies, 2017. Unity - Manual: Metallic vs Specular Workflow. [Online]
Available at: https://docs.unity3d.com/Manual/StandardShaderMetallicVsSpecular.html
[Accessed 24 April 2017].

Unity Technologies, 2017. Unity - Manual: Smoothness. [Online]
Available at: https://docs.unity3d.com/Manual/StandardShaderMaterialParameterSmoothness.html
[Accessed 24 April 2017].

Unity Technologies, 2017. Unity - Manual: The Fresnel Effect. [Online]
Available at: https://docs.unity3d.com/Manual/StandardShaderFresnel.html
[Accessed 24 April 2017].