# Introduction to Lighting and Rendering

# 介绍照明和渲染

Modern game lighting makes extensive use of ‘global illumination’.


Global illumination, or ‘GI’, is a term used to describe a range of techniques and mathematical models which attempt to simulate the complex behaviour of light as it bounces and interacts with the world. Simulating global illumination accurately is challenging and can be computationally expensive. Because of this, games use a range of approaches to handle these calculations beforehand, rather than during gameplay.

全局光照 GI,是用来描述一系列技术或数学模型的术语,模拟与世界交互的光照的复杂行为。准确地模拟出全局光照是具有挑战性的并且计算量高昂。正因为如此,游戏会在这之前就通过一系列方法先做好计算工作,而不是在游戏运行的过程中进行计算。

In this document we will give you an overview of how GI works in Unity. We will walk you through the different lighting techniques available, explain how to setup your project for lighting and then explore the various tools at your disposal when considering how to light a scene.

在这个文档中我们将会向你概述在 Unity 中 GI 是如何工作的。我们将带你领略不同的照明技术,解释给你的项目设置照明,然后在考虑如何在场景中加入光照时探索各种工具。