We need to calibrate the shadow detector for your light setup. If you aren't even close to getting your lighting done, do so first.

After calibration, if you change your lights, you may need to calibrate again.

The shader operates in two modes. These are controlled by the Calibrate node. A 1 here enables calibration mode. This is so you can render for shadow detector adjustment.

Do a render.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)