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Cath,

That node is a Math_Functions:Add node. Because you placed a 1 in Value_2, it adds them and produces 2. While you can get away with that on that node, it isn't what I intended for you to do. Just put a 2 in Value_1, or a 2.5, or 3, or 4. The purpose of that node is to detect where there is NOT a shadow, so that the shadow catcher effect is 0 (BLACK). That's why you tune upward until you get black in calibration mode.

I know BB thanks I was just quick playing with that but well setting the Calibrate_Black to higher values make it better , I just need some time to work with and find the best way for me to work it out.. so sometimes little experiments are fine, the above setting i did was only for myself to fit what I did not for the general usage ;) .. thank you again for the note about

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