3d 灯光技术基础（3D lighting technology foundation）.doc

3d 灯光技术基础（3D lighting technology foundation） 3D lighting technology foundation You may have little idea how the light source works in real world, but when you create light in the computer graphics world, you usually spend a lot of effort and try to achieve the desired effect. Three dimensional software allows you to create the freedom of any type of lighting at will, but sometimes it makes it difficult for you to create a realistic look in a delicate image. Its often helpful to know some basic lighting basics when youre having trouble lighting up in a particular scene. When you are ready to illuminate a scene, you should pay attention to the following questions: What type of environment is in the scene? Scene lights are usually divided into three types: natural light, artificial light, and the combination of the two. The typical natural light is the sun. When using natural light, there are several other questions to consider: what time is it in the day; the sky is clear and the sky is cloudy; and how much light is reflected in the environment? Artificial light can be almost any form. Lights, fires, or any type of environment lit up by the two 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 comes from and the quality of the light. If there are several light sources, which one is the main light source to be removed? It is also important to determine whether or not to use colored light. Almost all light sources have a color, not pure white. The last type of light is a combination of natural light and artificial light. Shooting in bright outdoor, photographers and lighting engineers sometimes use mirrors or auxiliary lights to ease harsh shadows. Whats the purpose of the light? In other words, what is the tone and atmosphere of the scene? Expressing a tone in the light is crucial to the overall appearance of the image. In some cases, the only objective is to clearly