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Primary Inputs:

• Albedo(Diffuse) : Should not have lighting; Metal have no diffuse(black);
• Specular: Only metals have colored specular; Non-metals: gray and quite dark; Very few details in a single material;
• Roughness(Surface smoothness, glossiness): 0=rough, 1=smooth;
• Normal map: tangent space normal map;

Optional Inputs:

• Emission
• Ambient Occlusion
• Heightmap(for parallax)
• Detail albedo/normal maps

Automatic Inputs:

• Shadowmaps
• Lightmaps

Reference:

1. Game environments-Part A: rendering Remember Me: http://www.fxguide.com/featured/game-environments-parta-remember-me-rendering/

2. Practical Physically Based Shading in Film and Game Producetion: http://blog.selfshadow.com/publications/s2012-shading-course/

3. Physically Based Shading in Theory and Practice: http://blog.selfshadow.com/publications/s2013-shading-course/

4. Physically Based Shading in Theory and Practice: http://blog.selfshadow.com/publications/s2014-shading-course/

5. Basic Theory of Physically-Based Rendering: http://www.marmoset.co/toolbag/learn/pbr-theory

6. PBR In Practice: http://www.marmoset.co/toolbag/learn/pbr-practice

7. http://www.pbrt.org/

8. Physically Based Shading in UE4: https://www.unrealengine.com/blog/physically-based-shading-in-ue4

9. Unity Physically Based Shading: http://aras-p.info/texts/files/201403-GDC_UnityPhysicallyBasedShading_notes.pdf

10: static sky unite: http://framebunker.com/blog/static-sky-unite-presentation/ 

11: Physically-Based Shading Models in Film and Game Production: http://renderwonk.com/publications/s2010-shading-course/

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