How does the light source work in reality? Fundamentals of 3D lighting technology

When you are going to light a scene, you should pay attention to the following problems: scene lighting is usually divided into three types: natural light, artificial light and their combinations. The last kind of lighting is a combination of natural light and artificial light. When shooting movies in bright outdoor, photographers and lighting engineers sometimes use mirrors or auxiliary lights to alleviate harsh shadows. In addition to the common lighting types, many 3D animation softwares also provide many special effects in the form of incandescent lamps, stereoscopic light sources and special material properties. Although strictly speaking, some are not light types, they are usually added to the appearance of visible light effects in scenes. A simple example is the flicker or luminescence of a visible light source. Since these effects cannot be generated automatically in 3D, you need to include them in the rendering and consider their appearance and advantages. By carefully analyzing the positions of highlights and shadows in a photo, it is usually possible to reconstruct the basic position and intensity of light that affects the image. You can also learn a lot by using the existing original materials to reconstruct the lighting layout. After considering the above questions, it's time to create a light for a scene. Although the number and types of light sources and their respective properties will vary from scene to scene, there are three basic types of light sources: main light, auxiliary light and background light, which work harmoniously together.