metalnessMap
The metalness map is a texture used in physically based rendering (PBR) workflows to define the metallic properties of a surface. It is typically a grayscale image where white represents fully metallic and black represents non-metallic, or dielectric. Intermediate shades of gray represent materials that have a mix of metallic and non-metallic properties, or surfaces with varying levels of micro-surface detail that affect specular reflections.
In PBR, the metalness value directly influences how light interacts with a surface. Metallic surfaces reflect
The precise interpretation of the metalness map can vary slightly between different PBR rendering engines and