How do I apply Post Processing to UI but not to the rest of the scene?

Goal: Get functional/interactable UI with separate post processing than other objects in scene
I’ve tried the following:

  • Camera Stacking
    • makes the camera at the bottom of the stack also affected by pp
    • for more info:
      • Main Camera only renders the default layer with a default layer PPV
      • UI Camera only renderers the UI layer with a UI layer PPV
      • Main Camera is the base camera with the UI camera as the overlay
    • see image:
  • Custom Render Feature
    • creates the image above, but the UI is no longer interactable
    • for more info:
      • Made a custom renderer for both cameras
      • UI camera outputs renderer data to a render texture
      • Using a fullscreen render feature, blit the output of the UI camera render texture to the main camera (looks great! but UI isn’t interactable…)
    • see image:

The second image is the target result, but the UI needs to be interactable :confused:
A tiny bit more info: the PPV for UI adds bloom; PPV for 3D scene just adds contrast