It is usually used to illuminate the main object in the scene and its surrounding area, and to function as a projection to the subject object. The main shading relationship is determined by the subject light, including the direction of the projection. The task of the main light can also be done together with several lights as needed. Not necessarily a light source, but it must be the primary source of illumination. Similarly, the key light does not have to be fixed in one place like a point source.
edit this paragraph auxiliary light
Auxiliary light is also called fill light. Illuminate the fan-shaped reflecting surface with a spotlight to form a uniform, non-direct soft light source, which is used to fill the shadow area and the scene area missed by the main light, to reconcile the contrast between the light and dark areas, and to form the depth of field and The level, and this wide uniform lighting feature makes it a background for the scene, defining the tone of the scene. In order to achieve a soft lighting effect, usually the auxiliary light has a brightness of only 50% - 80% of the subject light. A better way to simulate ambient light is to place low-intensity spotlights or floodlights in a reasonable position in the scene. This type of auxiliary light should reduce the shadow area and add some light to the lower edges and corners that cannot be directly illuminated by the subject light. In addition to the natural scattered light or ambient light in the scene, supplemental light is also used to illuminate areas that are too dark or to emphasize parts of the scene. They can be placed in opposite positions of the subject light to soften the shadows.
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