线条气势派头MG动绘AE教程 How to Create an Animated Envelope in After Effects
正在AE中操纵图形动绘，遮罩等本领建造线气势派头MG动绘教程，包罗挨枢纽帧的本领等
Evan walks through how to draw and animate a line art envelope step by step. This includes a neat trick for animating the paper that comes out of the envelope to give it a curled look.
