AE制作动态循环背景教程 Amazing Motion Graphics Background在AE中制作点状动态背景视频，用表达式来控制动态效果In this tutorial, we’ll take a look at how to create an amazing looking motion graphics background inside of Adobe After Effects.

用到的表达式：Time————————seedRandom(1,true);x = random(0.3,1.2);value * xOpacity————————seedRandom(1,true);random(0,100);Position————————value + [0,index*-30]