The Reflection Catcher can be used to “catch” reflections on specified objects.
These specified objects will not be rendered at all.

The “catcher” can be any kind of “StaticMeshActors” and needs reflective material supported by a “Planar Reflection”.

It´s possible to use multiple catcher objects.

Define a Reflection Catcher Object

All objects defined as “Set as reflection catcher object” which are equal to the “Reflection Catcher Objects” list within the Shield Actor, will be used as a catcher.

The plane below the mesh object is defined as a reflection catcher object (screenshot in edit mode/not in play)

The reflection will be visible in the RGB channel but doesn´t have an alpha channel.