What PBR means, in plain terms
PBR stands for physically based rendering. Instead of painting how a surface looks under one light, the maps describe what the surface is. Base colour is the colour with no light on it. Roughness says how sharp or blurred reflections are. Metalness says whether the surface reflects like a metal or like everything else. The normal map adds fine bumps without adding polygons. Ambient occlusion darkens the crevices. Because the maps describe properties, the same material looks right at noon in a game, under a studio light in a render and in daylight through a phone camera in AR.


















