What is PBR?
For complete guide on PBR visit Allegorithmic's page.
Basically physically based rendering is a method of rendering and shading. This techique provides more realistic representation of how light interacts with model surface.
There are 2 workflows that will produce the same material results.
Metallic workflow is made out of minimum 3 textures:
- Base color (RGB) - engine will use it to interpret diffuse reflected color and also metal reflectance
- Metallic - Grayscale - it tells the engine what parts of material are metallic(reflectice) and which are not. For instance white value is 100% metal, black 0% metal. Value between white and blue, for instance light grey will show transition between metal and non metal material, for instance a bit of dust.
- Roughness - Grayscale - engine will use this to create either smooth surface(white) like glass or rough like concrete(grey-black). It can be use to create small details like scratches, fingerprints etc.