From：Rainbow Confetti Co.,ltd Release time：2019-10-29
Overview：I have seen a lot of bar decoration renderings, and the stage lighting equipment found that the use of lighting in the private room is a key element of the design. Many renderings use common design techniques and materials, but as long as the lighting effects are focused on, the entire private room will be completely renewed.
Technical knowledge of lighting design
I have seen a lot of bar decoration renderings, and the stage lighting equipment found that the use of lighting in the private room is a key element of the design. Many renderings use common design techniques and materials, but as long as the lighting effects are focused on, the entire private room will be completely renewed.
Because the lighting effect pays attention to the overall feeling of the scene, the design of the lighting must fully consider the scene effect to achieve the harmony and perfection of the lighting effect.
1, first of all to clear the purpose of the light
In the design of the use of lighting, the first thing to understand is the design of the atmosphere to create a scene of the atmosphere. Creating a unique style of tone in the light is critical to the look of the entire scene. Lights often represent a feeling, or can freeze the eyes of the audience, thus showing a richer level of scenes and increasing the depth of the scene. So be sure to understand when designing the lighting: Does the design lighting enhance the content of the scene? What kind of tone does the design lighting show? Are there special lighting effects in the scene, and if so, should they be created with lights or by other means?
In addition to the usual types of lighting, many 3D animation software offers many special effects in the form of incandescent lights, stereo light sources and special material properties. Although strictly speaking, some types that are not part of the light, in the scene, they are usually added to the appearance of the visible light effect. A simple example is the brilliance or luminescence of a visible light source. Since these effects are not automatically generated in 3D, you need to include them specifically in the rendering and consider their appearance and strengths.
2, secondly, to identify the type of environment represented in the scene
The lights in the scene are generally divided into three types: artificial light, natural light, and a combination of the two.
1, artificial light: very simple is the light source invented by people, artificial light may be the most common of the three types of light sources. You also need to consider where the light comes from and how good the light is. If there are several light sources, which one to clear is the main light source? It is also important to determine if color light is used. Almost all light sources have a colored color instead of pure white.
2, natural light: that is, the sun. When using natural light, there are several other issues to consider: what time of day is it; whether the sky is clear or cloudy; and how much light is reflected in the environment?
3. Combination of artificial light and natural light: When shooting movies in bright outdoor, photographers and lighting engineers sometimes use mirrors or auxiliary lights to alleviate the shadows.
3, to make your own lighting design is simple and necessary
There may be a lot of lighting designs in the design, so be sure to find out if your lighting design is the easiest and necessary.
The lighting in the scene is different from the real lighting. It takes a lot of effort in rendering time. The more complex the lighting settings, the more time it takes to render, and the harder it is to manage lighting. When the light source is added, the reflection point is naturally reduced. At some point, increasing the light source does not improve the appearance of the scene and it will become difficult to distinguish the value of the added light source. You can try to look at each light source independently to measure its relative value to the scene. If you have doubts about its role, delete it.
4, collect a variety of information, find design references
When creating realistic scenes, you should develop the habit of taking pictures from actual photos and movies. Good references can provide clues as to what a particular object and environment look like at different times of the day or under certain conditions. By carefully analyzing the position of highlights and shadows in a photo, you can usually reconstruct the basic position and intensity of the light that acts on the image. You can also learn a lot by rebuilding the lighting layout using existing source materials. After considering the above questions, you should now create lights for a scene. Although the number and type of light sources and their individual properties will vary from scene to scene, there are three basic types of light sources: key light, supplemental light, and background light that work together.
5, the background light
Background light is often used as "edge light" to separate the target object from the background by illuminating the edges of the object. It is often placed directly opposite the three-quarters of the key light, which acts on the edges of the object, causing a small reflection of the highlight. If the model in a 3D scene consists of many small rounded edges, this highlight may increase the credibility of the scene.
6, supplemental light
Supplemental light is used to fill the dark and shaded areas of the scene. The key light is the most attractive source of light in the scene, but the light that complements the light provides depth of field and a realistic feel. The more important supplemental light comes from natural diffuse reflection, a type of light commonly referred to as ambient light. This type of light is important, in part because it increases the brightness of the entire scene. Unfortunately, the ambient light of most renderers is uniformly applied to the entire scene. It reduces the overall darkness of the scene, it eliminates some of the possible features, and can't model any light and shadow on a bright object, which is the main reason why the scene doesn't look realistic.
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 key light.
In addition to the natural scattered light or ambient light in the scene, supplemental light is used to illuminate areas that are too dark or to emphasize portions of the scene. They can be placed in opposite positions of the key light to soften the shadows.
7, the key light
In a scene, its primary source is often referred to as key light. The key light is not necessarily just 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.
Although the point source is usually placed in three-quarters of the position (45 degrees from the front of the object and 45 degrees up from the center line, this position is often used as a fixed position), but depending on the needs of the specific scene It can also come from below or behind the object, or anywhere else. The key light is usually the first light source placed and used to create a preliminary lighting effect in the scene.
Although the initial placement provided a good way to illuminate objects, the results were indeed monotonous and uninteresting images. The shadows are usually very rough and very noticeable. Again, the scene always looks too dark, because there is no natural ambient light to highlight the shadow area. This situation is useful in certain scenarios, such as night scenes, but for most screens, it seems a bit inappropriate.
8, building light sources, illuminated displays and other independent small combined light sources, sometimes can be created with textures instead of the actual light source.
9. Exclude some objects from the light source
Excluding an object from some sources saves time when rendering.
This principle is also true for making shadows. Every light source in the scene is used to make shadows, which is rare. Making shadows can be very expensive (especially in the case of ray-traced shadows) and sometimes harmful to the final image.
10, pay attention to the use of lighting design tips
For example, adding color or texture to a light source may make it easy to get a good atmosphere.
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