Discuss the role of lighting on the stage?

When you are preparing to light a scene, you should pay attention to the following questions:

1. What type of environment is there in the scene? Scene lighting is usually divided into three types: natural light, artificial light and a combination of the two. The representative natural light is sunlight. When using natural light, there are several other issues to consider: What time of day is it; is it sunny or overcast; and, how much light is reflected in the environment? Artificial light can be in almost any form. Any type of environment illuminated by electric light, fire, or both can be considered artificial. Artificial light is probably the most common of the three types of light sources. You also need to consider where the light is coming from and what its quality is. If there are several light sources, do you need to figure out which one is the main light source? It is also important to determine whether to use colored light. Almost all light sources have a colored tint rather than pure white. The last type of light is a combination of natural and artificial light. When shooting movies outdoors in bright locations, cinematographers and lighting engineers sometimes use reflectors or fill lights to soften harsh shadows.

2. What is the purpose of lighting? ?In other words, what is the tone and atmosphere of the scene? Expressing a tone in the lighting is crucial to the overall look of the image. In some cases the only goal is to see one or a few objects clearly, but often this is not the case and the actual goal is quite complex. Lighting helps express an emotion or guide the viewer's eyes to a specific location. It can provide greater depth to the scene and show rich layers. So when creating lighting for a scene, you can ask yourself, what tone do you want to convey? Does the lighting you set up enhance the story? -Are there any special lighting effects in the scene, and if so, should they be created with lights or through other means? In addition to the usual types of lights, many 3D animation software provides many special effects in the form of incandescent lights, stereo light sources and special material properties. While some are not strictly speaking types of lights, they are often added to the appearance of visible light effects in a scene. A simple example is the shine or glow of a visible light source. Since these effects do not occur automatically in 3D, you need to specifically include them in your rendering and consider their appearance and strengths.

3. Are there any reference materials for the source of creation? When creating realistic scenes, make a habit of drawing from actual photos and movies. Good reference materials can provide clues as to what certain objects and environments look like at different times of day or under certain conditions. By carefully analyzing the position of highlights and shadows in a photo, it is often possible to reconstruct the basic position and intensity of light acting on the image. A lot can also be learned by using existing source material to recreate lighting arrangements. After considering the above issues, it is time to create lights for a scene. Although the number, type, and individual properties of light sources will vary from scene to scene, there are three basic types of light sources: key light, fill light, and background light, which all work together in harmony.

4. Key light In a scene, its main light source is usually called the key light. The key light does not have to be just a light source, but it must be the main source of lighting. Likewise, key lights are not necessarily fixed in one place like point lights. Although the point light source is usually placed at a three-quarter position (turned 45 degrees from the front of the object and 45 degrees upward from the center line, this position is often used as a fixed position), depending on the needs of the specific scene , or it can come from below or behind the object, or from any other location. The key light is usually the first light source placed and used to create preliminary lighting effects in the scene. Although the initial placement provided a good way to light the object, the result was a dull and uninteresting image. Shadows are often harsh and very noticeable. Likewise, scenes always look too dark because there's no natural ambient light to brighten shadow areas. This situation is useful in certain scenes, such as night scenes, but for most scenes, it seems inappropriate.

5. Fill light Fill light is used to fill the dark and shadow areas of the scene. The key light is the most noticeable light source in the scene, but the light from the fill light can provide depth of field and a sense of realism. The more important supplementary light comes from natural diffuse reflection. This type of light is often called ambient light. Part of the reason this type of light is important is that it increases the brightness of the entire scene. Unfortunately, most renderers apply ambient light uniformly to the entire scene. By reducing the overall darkness of the scene, it eliminates some possible features and cannot model any lights and shadows on illuminated objects, which is the main reason why the scene does not look realistic. A better way to simulate ambient light is to place low-intensity spotlights or floodlights at strategic locations in the scene. This type of fill light should reduce shadow areas and add some light to the lower edges and corners that cannot be directly hit by the key light. In addition to the natural scattered light or ambient light in the scene, fill light is used to illuminate areas that are too dark or to emphasize certain parts of the scene.

They can be placed opposite the key light to soften shadows.

6. Background light Background light is usually used as an "edge light" to separate the target object from the background by illuminating the edge of the object. It is often placed directly opposite the three-quarter key light, where it works on the edges of the object, causing small reflective highlights. If the model in a 3D scene consists of many small rounded edges, this highlight may increase the believability of the scene. Other Types of Light Sources Actual light sources are those lighting sources that actually appear in the scene. Table lamps, car headlights, lightning, and wildfires are all potential light sources. After setting up the lighting for your scene, there are a few other factors to consider.

7. Is my solution simple and necessary? The lights in the scene are different from real lights. They require more effort in rendering time. The more complex the lighting settings are, the more time it takes to render and the more difficult it becomes to manage the lights. You should ask yourself whether each type of light is necessary for the look you are creating. When increasing the light source, the number of reflection points will naturally decrease. At some point, adding a light source will not improve the appearance of the scene, and it will become difficult to distinguish the value of the added light source. You can try looking at each light source independently to gauge its relative value to the scene. If in doubt about its usefulness, delete it.

8. Do some objects need to be excluded from the light source? Excluding an object from some light sources can save time during rendering. This principle is also true for making shadows. It's rare that every light source in the scene is used to create shadows. Creating shadows can be expensive (especially in the case of ray traced shadows) and sometimes detrimental to the final image.

9. Can any light be simulated using texture effects instead of actual light sources? Architectural lights, illuminated displays, and other independent small combined lights can sometimes be created with maps instead of using actual light sources.

10. Are there any techniques that can be used to make the scene more realistic? For example, adding color or texture to the light source may easily make the scene better.