Thank you for the reply.
That’s true, but in that case the plane would be constrained to the camera. I need the plane to be placed in the map by the user and just be there. When it leaves the camera’s FOV, it would not show anymore.
The goal is to use a material in that plane with a mask/opacity/etc. so that it mixes with the map itself. I have been able to accomplish this easily attaching the plane to the camera, but I’m needing this location-fixed pattern as well.