I hate adding an AO node just to generate a mask. It adds ten years of processing time, and I don't need it to be physically based right now!
This node sprung from that frustration, along with three others.
I use them absulutely every time I need an effect that doesn't require the extra features of the Allegorithmic nodes.
You'll find the other three nodes on my Gumroad:
Uploaded: about 2 years ago
Updated: about 2 years ago
File Name: AO_fast.sbs
Size: 8.22 KB