The Unity3D 2018 version uses the Post-Process component to add screen effects to the screen, and adds a plane effect component to the camera according to the previous version. The 2018 version needs to add the Post Process Layer.cs script on the Camera (if you want the camera to work, this must be added), the Post Process Volume.cs script
Post Process Layer: Controls the camera effect rendering layer
Post Process Volume: Camera Effects Control
As shown in the figure:
The point is, if you want the camera to turn on the screen effects, there are two things that must be set the same. As shown in the figure below, the Layer of the camera must be consistent with the Layer in the Post Process Layer.
For the introduction and implementation of other Post Process functions, please refer to GitHub
https://github.com/Unity-Technologies/PostProcessing/wiki/Quick-start
source code
https://github.com/Unity-Technologies/PostProcessing