Appearance
用于在three.js中实现后期处理效果。该类管理了产生最终视觉效果的后期处理过程链。 后期处理过程根据它们添加/插入的顺序来执行，最后一个过程会被自动渲染到屏幕上。
postprocessing
postprocessing advanced
postprocessing backgrounds
postprocessing transition
postprocessing depth-of-field
postprocessing depth-of-field 2
postprocessing fxaa
postprocessing glitch
postprocessing godrays
postprocessing gtao
postprocessing masking
postprocessing material ao
postprocessing outline
postprocessing pixelate
postprocessing procedural
postprocessing rgb halftone
postprocessing sao
postprocessing smaa
postprocessing sobel
postprocessing ssaa
postprocessing ssao
postprocessing taa
postprocessing unreal bloom
postprocessing unreal bloom selective