Metalness map defines the areas on the material that behave like a metal and non-metal. The metalness map determines which type of reflection on the material is (dielectric or metallic). Metalness affects the ability of the metal to reflect light, as well as the ability to absorb light that shines on the material.

All objects in the world are divided into dielectrics (insulators) and metals.

Dielectrics (for example, plastic) absorb light partially, and some of the light is reflected. Dielectrics always reflect the same light that is shone on them. Metals do not transmit light, but reflect it, partially or completely. We can see a colored glare, where the light is reflected on the object. This glare has the color of the metal (for example, copper, gold). Dielectrics also reflect light, but in much smaller quantities than metals.

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