I am working on an unlit scene for a mobile project, there will be no lights, no lightmaps, no post-processing. So I am using Tappy Chicken as a reference project in some areas. And one thing made me curious: it’s using unlit materials only, and no post processing, but… it still has a post process volume defined in the scene.
What are the reasons behind it? Should we always define a post process volume with zero values or creating no post process volume at all is also ok? How does it affect performance, especially on low-end mobile devices? Are there any other consequences of using or not using the post process volume?