Quote - ... Looks like the ground plane set as shadow catch only to me. It seems unlikely that BB would use compositing in one of his example renders.

BB has a shadowcatcher shader... 

https://sites.google.com/site/bagginsbill/free-stuff/shadow-catcher

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The Wisdom of bagginsbill:

"Oh - the manual says that? I have never read the manual - this must be why."
“I could buy better software, but then I'd have to be an artist and what's the point of that?"
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