In addition to Environment lights, which emit light from 360 degrees, there are also Directional lights, which emit light from one direction only. If a light is moved, becomes brighter, or larger, all of that information is visible directly on the chrome surface in almost mirror-like detail, so it can appear completely different from one light condition to the other. Take metals for instance: a chrome object is basically reflecting everything around it. Some materials are more sensitive to lighting conditions than others. Lights expose dimensionality of anything that exists in a 3D scene. Rays bounce off shapes and interact with their materials, effectively defining how objects appear in the final image. Light mechanics in a computer generated 3D scene follow the same natural principle of photon scattering, through a process called ray tracing. What we interpret as an object color, glossiness, translucency or metallic qualities are all products of the interaction between the photons and the object’s surface. This information is processed by our brain to produce an image. We can see because our eyes are picking up information brought to us by elementary particles called photons. We perceive the world around us using our senses: we hear, we feel, we smell, we see.
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