This plugin implements a framework for writing multipass post processing effects using scene view extensions. It also includes three example post processing effects, a deinterlacing style effect, an accumulation motion blur effect, and a sharpening effect.
If you want to write your own effect using the framework, take a look at InterlacePPSceneExtension and AccumulationMotionBlurSceneExtension.
You can control the included effects by using the provided console commands or by using a blendable object.
The console commands are:
r.AccumulationMotionBlur.Scale
r.AccumulationMotionBlur.Weight
r.AdaptiveSharpening.Enabled
r.AdaptiveSharpening.Strength
r.InterlacingPP.Enabled
The console commands take precedence over the blendables. For example, if the r.AdaptiveSharpening.Strength is set to 1 then that overrides any blendables currently applied in the post processing settings.
This way of controlling the post processing effects is a bit harder. You can control the post processing effects by constructing a blendable object and adding/updating it in a post process volume or in a camera's post processing settings. You can see how to do this here in the How to create your own Blendable (in C++) section.
The blendable objects you can construct and add are: AdaptiveSharpenBlendable, InterlacePPBlendable, and AccumulationMotionBlurBlendable.