Trigger a post process volume with third person character colliding with a trigger box.

[coldbergina]

Hello ! I am new to Unreal Engine and for my game i want that when my character steps on the trigger box, a post process appears.
in my scene i have 2 post process. I want to call the “PostProcess2”

Thank you very much

Emma

[dB035]

Rather than setting “Tick” enabled/disabled, you can simply pull the blue node off of the Volume reference itself and choose “Set Enabled” under Variable:

If you’d like to disable the first Post Process Volume at the same time then you can do so, just disabling it rather than enabling it. If you’d like to ensure PostProcess2 is disabled at the start, search for “Enabled” in its settings in the level and uncheck the box:

Then, in your Level Blueprint, make sure to set the Enable variable.

In-case you’re wondering why “Tick” can’t be used:

A “Tick” is effectively a single evaluation of a script, run in intervals. My understanding is that Post Process volumes don’t “Tick” like Blueprint scripts as they occur on the graphics card after the game’s processes have processed (hence: “post process”) and before the final image is displayed. Because of this, “Tick” won’t actually enable or disable the volume. Thankfully, they’ve included the aforementioned Enable checkbox.

[coldbergina]

Thank you so much for your help !