Im using the 'infinite floor' technique a la GSG, which basically means using a compositing tag with 'Compositing Background' checked. It looks great except that anything above the horizon line of the plane doesn't show transparency, it just has a hard cutoff line along it. See attached image, near the top of the box the transparency just gets sliced.
I understand why it happens, just wondering if there's any way around it? Any help is much appreciated!
Just replace the Sky object of the Seamless Floor with a large Sphere object. Apply the same material and the compositing tag to the sphere. Uncheck "Receive Shadows" and check "Compositing Background" in the compositing tag. This should do the job.