Planar reflections / "Hidden Actors" and "Show Only Actors" not working

“Hidden Actors” and “Show Only Actors” do not seem to work in PlanarReflections: the drop down menu always shows “None” after selecting any object. Does this need to be enabled somehow?

The problem affects 4.16 preview 2 and previous versions of the engine.

Hey xN31,

I have not reproduced this issue in the 4.16 preview. I tested this by following these steps:

  • Enable global clip plane for planar reflections in project settings
  • Add a planar reflection actor to the default scene
  • Add a basic cube so it appears in the reflection
  • Select planar reflection actor and add cube to hidden actors list

The cube no longer appeared in the reflection as expected. I also tested the show only actors feature and it worked as expected as well. Some extra steps I took were to add a reflective metalic material to the floor mesh and hide the preview plane from the planar reflection actor.

Here is a video showing the test results.

Would you mind testing this in a blank project using a similar test as the one listed above?



Hi Ed, sorted the issue out. You can add objects to the lists only if they are in the same level of the planar reflection actor.
In my case I was trying to add objects in the same map but in a different (streamed) level.

Is this intentional or a bug? Is there any way around this?

Thank you for the additional info. I have reproduced this issue and logged a report for it here: Unreal Engine Issues and Bug Tracker (UE-44762)

You can track the report’s status as the issue is reviewed by our development staff. Please be aware that this issue may not be prioritized or fixed soon.


Also, you can’t add LIGHTS to this list. Only works with geometry which is kind of annoying

I have planar reflections inside blueprint with static mesh components.

  • I can’t select any actors from same blueprint to Hidden Actors or Show Only Actors list
  • Also tested to create list before making blueprint, but links to actors will broke after i convert blueprint from selected actors.

I am having this issue in 4.17.1 and even using the picker on a single persistent level will not fill the Array elements. Also wondering if anyone found an option to remove PlanarReflectionComponets from the list of rendered items?

Why is this bug back logged?

The bug is back at 4.17.1. I didn’t have the issue in 4.16!!!

I am experiencing this too in 4.18. I can’t add anything into the Hidden Actors Array

Having this issue with 4.18 also. “Show Only Actors” won’t let me pick anything. Says only “None”.