How do I set film grain and other post processing effects during run time in blueprints?
You need a “Make PostProcessSettings” node
when you select it , in the details pane you will see all the available options you can make “pins” for and either hand type values or connect to variables to set them.
Once done create a “Set Post Process Settings” node. You may need to untick context sensitive option, and its the one under camera or “Set settings” under post process volume
Make sure you plug in the correct source (Camera for first option or postprocessvolume for second) and the make node you just created