My last post of this was marked as a duplicate for glass shaders. I want to make explicitly clear, I am NOT asking for glass shaders. I'm doing a bit of archviz for a buddy's bathroom remodel, and I want the windows and reflective surfaces to show a background without it darkening the scene. In 2.79 you could set the object ray visibility, but that seems to have been removed. (As shown in this post; Plane to only reflect object?) I know I could use view layers, but next to a window is a glass plane that reflects the environment, and I don't know how I'd composite that in. I've also added in an external ground plane to get some ground color bounces. By the end result, I want the brightness afforded by the background plane NOT being there, but have it appear in the final image and reflections. Note the reflection in the glass
For a simple demonstration, I made a plane and some glossy spheres with an HDRI, I need the light to pass through the plane and reflect off the lower sphere underneath it, without it also creating a shadow from the plane. In the scene I have the light should be passing through the plane without the plane casting a shadow and darkening the scene.