After Effects Inner/Outer Key至少必须要有几个Mask才能使用（）
举一反三
- Inner/Outer Key至少必须3个Mask才能使用（）
- After Effects某些Effect需要根据Mask发生作用,但应用效果Effect的Mask必须是封闭的
- 在After Effects中，Mask的基本型有：
- What is the material of the doll's packing? A: The inner is Bag and the outer is Carton. B: The inner is Bag and the outer is Box. C: The inner is Box and the outer is Carton. D: The inner and the outer are both Box.
- 智慧职教: After Effects 中，多个mask之间能做哪些运算来组成不同的mask形状？